This document summarizes a study that assesses the seismic performance of reinforced concrete steel (RCS) frame buildings compared to ordinary reinforced concrete (RC) buildings using pushover analysis. RCS buildings combine RC columns for their stiffness and damping properties with steel beams for their lightweight construction. The study designs a 3-story RCS building and RC building without shear walls according to Egyptian building codes. Pushover analysis is used to generate base shear-displacement curves and evaluate member forces, yielding, and inter-story drift under increasing lateral loads to compare the seismic performance of the two building types.
Dynamic Analysis of RC Multi-storeyed Building - A Comparative Studyijsrd.com
In India with a seismic moderate zone, the equivalent static force method to estimate the seismic force, subsequent vulnerability and behavior of RC building under seismic load is inadequate. The main goal of this paper is to show how the modal analysis can contribute to the understanding the behavior of building using Response Spectrum Method. In this study, Dynamic Analysis of four storied Reinforced Concrete building was investigated using Staad pro and Etabs software packages. For this, Response Spectrum Method was used to evaluate the base shear, frequency, modal mass participation and the mode shapes of the building have been plotted for 15 frequencies. Seismic Zone 3 has been considered and base shear was calculated as per the procedure recommended by IS 1893-2002. The results shows that only slight variation in frequencies and modal participation factors was observed as each software has its own way of considering the mass.
IRJET- Study of Literature on Seismic Response of RC Irregular StructureIRJET Journal
The document discusses vertical irregularities in reinforced concrete (RC) buildings and their effects on seismic response. It first defines vertical irregularities as weaknesses caused by discontinuities in mass, stiffness, or geometry between storeys. Soft stories, where the stiffness suddenly decreases, are one type of vertical irregularity. The document then reviews several previous studies on modeling and analyzing vertically irregular buildings using pushover analysis, which incrementally loads a structure to determine its failure mechanisms. The studies found that soft story buildings absorb energy through overturning and shear deformation. Irregular buildings may have similar seismic performance to regular buildings if properly designed. Quantifying the degree of irregularity can help evaluate seismic vulnerability and retrofitting needs.
IRJET- A Review on Progressive Collapse of Composites StructuresIRJET Journal
This document reviews previous research on analyzing the progressive collapse of composite structures. Some key studies analyzed steel and concrete buildings using linear and nonlinear static/dynamic analyses and investigated how their behavior changed with the sudden removal of columns. Percentage increases in demand capacity ratios, base shear, and roof displacements were calculated. The current study aims to analyze the progressive collapse of a G+20 composite building using ETABS software and investigate how its behavior changes under extreme loading conditions based on guidelines from the US General Services Administration.
IRJET- Seismic Analysis of Multi-Storey Building with and without Floating Co...IRJET Journal
The document analyzes the seismic behavior of multi-storey buildings with and without floating columns through time history analysis. Three buildings of heights G+3, G+10 and G+15 were modeled with different floating column configurations and subjected to earthquake excitations. Results for base shear, storey displacement and acceleration were compared. Introduction of floating columns increased time period and responses like displacements and storey drifts compared to regular buildings. Peak responses occurred for floating columns at the edge of exterior frames. The time history analysis method was used to evaluate the dynamic response of models to code-specified earthquake ground motions.
IRJET- A Review on Seismic Performance of Different Types of Flat Slab Buildi...IRJET Journal
This document reviews several papers on the seismic performance of different types of flat slab building systems with composite columns. Some key findings from the papers discussed include:
1) Flat slab buildings with shear walls showed better seismic performance than other flat slab systems in terms of lower storey shear, base shear, and storey drifts.
2) Composite columns made of concrete-filled steel tubes performed better in regular building plans, while composite columns with encased I-sections did better in irregular building plans.
3) The addition of shear walls to flat slab buildings significantly increased their lateral stiffness and seismic performance.
4) One study found that a grid slab structure had better seismic behavior than a flat slab or conventional
Performance based analysis of rc building consisting shear wall and varying i...Yousuf Dinar
Abstract:
Metropolitan cities are under severe threat because of inappropriate design and construction of structures. Faulty building designed without considering seismic consideration could be vulnerable to damage even under low levels of ground shaking from distant earthquake. So, structural engineers often are more concerned about the constructing Shear wall without knowing its performance with respect to infill percentage which may lead it to an over design state without knowing the demand. Nonlinear inelastic pushover analysis provides a better view about the behavior of the structures during seismic events. This study investigates as well as compares the performances of bare, different infill percentage level and two types of Shear wall consisting building structures and suggests from which level of performance shear wall should be preferred over the infill structure. To perform the finite element simulation ETABS 9.7.2 is used to get the output using pushover analysis. For different loading conditions, the performances of structures are evaluated with the help of base shear, deflection, storey drift, storey drift ratio and stages of number of hinges form and represented with discussion.
1. The document describes a project seminar on parametric study of multi-storey reinforced concrete flat slab structures under seismic effects with varying plan aspect ratios and slenderness ratios.
2. 25 structural models are created with different plan dimensions, aspect ratios ranging from 1-5, and slenderness ratios ranging from 0.48-2.88. Static and dynamic analysis is performed using ETABS software.
3. Results for base shear, storey drift, storey stiffness, natural period, and maximum displacements are obtained and compared across the models to determine limiting aspect and slenderness ratios for seismic safety of the structures.
Dynamic Analysis of RC Multi-storeyed Building - A Comparative Studyijsrd.com
In India with a seismic moderate zone, the equivalent static force method to estimate the seismic force, subsequent vulnerability and behavior of RC building under seismic load is inadequate. The main goal of this paper is to show how the modal analysis can contribute to the understanding the behavior of building using Response Spectrum Method. In this study, Dynamic Analysis of four storied Reinforced Concrete building was investigated using Staad pro and Etabs software packages. For this, Response Spectrum Method was used to evaluate the base shear, frequency, modal mass participation and the mode shapes of the building have been plotted for 15 frequencies. Seismic Zone 3 has been considered and base shear was calculated as per the procedure recommended by IS 1893-2002. The results shows that only slight variation in frequencies and modal participation factors was observed as each software has its own way of considering the mass.
IRJET- Study of Literature on Seismic Response of RC Irregular StructureIRJET Journal
The document discusses vertical irregularities in reinforced concrete (RC) buildings and their effects on seismic response. It first defines vertical irregularities as weaknesses caused by discontinuities in mass, stiffness, or geometry between storeys. Soft stories, where the stiffness suddenly decreases, are one type of vertical irregularity. The document then reviews several previous studies on modeling and analyzing vertically irregular buildings using pushover analysis, which incrementally loads a structure to determine its failure mechanisms. The studies found that soft story buildings absorb energy through overturning and shear deformation. Irregular buildings may have similar seismic performance to regular buildings if properly designed. Quantifying the degree of irregularity can help evaluate seismic vulnerability and retrofitting needs.
IRJET- A Review on Progressive Collapse of Composites StructuresIRJET Journal
This document reviews previous research on analyzing the progressive collapse of composite structures. Some key studies analyzed steel and concrete buildings using linear and nonlinear static/dynamic analyses and investigated how their behavior changed with the sudden removal of columns. Percentage increases in demand capacity ratios, base shear, and roof displacements were calculated. The current study aims to analyze the progressive collapse of a G+20 composite building using ETABS software and investigate how its behavior changes under extreme loading conditions based on guidelines from the US General Services Administration.
IRJET- Seismic Analysis of Multi-Storey Building with and without Floating Co...IRJET Journal
The document analyzes the seismic behavior of multi-storey buildings with and without floating columns through time history analysis. Three buildings of heights G+3, G+10 and G+15 were modeled with different floating column configurations and subjected to earthquake excitations. Results for base shear, storey displacement and acceleration were compared. Introduction of floating columns increased time period and responses like displacements and storey drifts compared to regular buildings. Peak responses occurred for floating columns at the edge of exterior frames. The time history analysis method was used to evaluate the dynamic response of models to code-specified earthquake ground motions.
IRJET- A Review on Seismic Performance of Different Types of Flat Slab Buildi...IRJET Journal
This document reviews several papers on the seismic performance of different types of flat slab building systems with composite columns. Some key findings from the papers discussed include:
1) Flat slab buildings with shear walls showed better seismic performance than other flat slab systems in terms of lower storey shear, base shear, and storey drifts.
2) Composite columns made of concrete-filled steel tubes performed better in regular building plans, while composite columns with encased I-sections did better in irregular building plans.
3) The addition of shear walls to flat slab buildings significantly increased their lateral stiffness and seismic performance.
4) One study found that a grid slab structure had better seismic behavior than a flat slab or conventional
Performance based analysis of rc building consisting shear wall and varying i...Yousuf Dinar
Abstract:
Metropolitan cities are under severe threat because of inappropriate design and construction of structures. Faulty building designed without considering seismic consideration could be vulnerable to damage even under low levels of ground shaking from distant earthquake. So, structural engineers often are more concerned about the constructing Shear wall without knowing its performance with respect to infill percentage which may lead it to an over design state without knowing the demand. Nonlinear inelastic pushover analysis provides a better view about the behavior of the structures during seismic events. This study investigates as well as compares the performances of bare, different infill percentage level and two types of Shear wall consisting building structures and suggests from which level of performance shear wall should be preferred over the infill structure. To perform the finite element simulation ETABS 9.7.2 is used to get the output using pushover analysis. For different loading conditions, the performances of structures are evaluated with the help of base shear, deflection, storey drift, storey drift ratio and stages of number of hinges form and represented with discussion.
1. The document describes a project seminar on parametric study of multi-storey reinforced concrete flat slab structures under seismic effects with varying plan aspect ratios and slenderness ratios.
2. 25 structural models are created with different plan dimensions, aspect ratios ranging from 1-5, and slenderness ratios ranging from 0.48-2.88. Static and dynamic analysis is performed using ETABS software.
3. Results for base shear, storey drift, storey stiffness, natural period, and maximum displacements are obtained and compared across the models to determine limiting aspect and slenderness ratios for seismic safety of the structures.
IRJET- Seismic Analysis of Steel Frame Building using Bracing in ETAB SoftwareIRJET Journal
This paper compares the seismic analysis of a G+11 square building and L-shaped building using time history analysis in ETAB 17.01 software. Different types of bracing systems are used, including X, V, inverted V, and diagonal bracing. The response of the buildings is compared in terms of displacement, base shear, and pseudo acceleration to determine which type of building and bracing system provides the minimum response. The L-shaped building with X bracing is found to have the minimum displacement, while the square building with X bracing has the minimum base shear and pseudo acceleration.
DESIGN AND ANALYSIS OF MULTI STORIED STRUCTURES USING STATIC NON LINEAR ANALYSISIjripublishers Ijri
In plan during the seismic excitation using nonlinear static analysis (pushover) have been performed on the
same structure. The literature pertaining to pushover analysis is reviewed. The pushover analysis adopted
in the present study is on similar lines with the procedure presented by Ashraf Habibullah and Stephen
Pyle using ETABS V 9.7 structural analysis software. The effect of earthquake force in a idealized G+4 story
building under maximum earthquake zone, with the help of pushover analysis has been investigated and
the results were compared in terms of base shear, displacement, spectral acceleration, spectral displacement
and effective damping and effective time period .to strengthen the symmetric and un symmetric RCC
framed buildings` steel braces are included by using retrofitting method.
This document summarizes a thesis analyzing the seismic performance of a 13-story building model with and without shear walls. Two models are considered: a bare frame structure and a shear wall frame structure. Both models are analyzed using ETABS software under wind and earthquake loading conditions in Seismic Zone III. The results show that the shear wall structure performs much better in terms of limiting lateral displacement, storey drift, and increasing stiffness and strength. It is concluded that the shear wall frame structure provides more reliable performance against lateral loads.
Analysis and design of shear wall transfer beam structurephamtraoag
The document analyzes the stress behavior of shear walls and transfer beams due to their interaction. It presents a finite element analysis of a 22-story building model consisting of shear walls, transfer beams, and columns. Two analyses are performed: 1) With vertical loads only to verify the stress behavior matches previous research. 2) With both wind loads and vertical loads to observe stress behavior differences and obtain results for transfer beam design. Based on the second analysis, the transfer beam reinforcement is designed according to CIRIA Guide 2:1977 design standards.
Seismic Analysis of G 10 Storey Building with Various Locations of Shear Wall...ijtsrd
Shear walls are specially designed structural members provided in the multi storey buildings to resist lateral forces. These walls have very high in plane strength and stiffness, which can resist large horizontal forces and can support gravity loads. There are lots of literatures available to design and analyse the shear wall. Ravi Kumar Vishwakarma | Vipin Kumar Tiwari "Seismic Analysis of G+10 Storey Building with Various Locations of Shear Walls using Etabs" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-4 , June 2021, URL: https://www.ijtsrd.compapers/ijtsrd43646.pdf Paper URL: https://www.ijtsrd.comengineering/structural-engineering/43646/seismic-analysis-of-g10-storey-building-with-various-locations-of-shear-walls-using-etabs/ravi-kumar-vishwakarma
This document presents the results of a pushover analysis conducted on 9 structural models with varying plan irregularities. The models were analyzed using ETABS software to determine key parameters such as lateral displacement, story drift, base shear, and performance point. The results show that structures with complex geometries experience greater lateral displacement, story drift, and base shear compared to regular structures. Pushover curves indicate that irregular structures may not achieve desired performance levels at lower displacement thresholds. In conclusion, simple and regular building geometries perform better during earthquakes by attracting fewer seismic forces.
Influence of Concrete and Steel Outrigger and Belt Truss in High Rise Moment ...IRJET Journal
1. The document analyzes 7 models of a 44-story reinforced concrete frame building with different outrigger and belt truss configurations to evaluate their effectiveness in reducing lateral displacement, storey drifts, base shear, and fundamental time periods under wind and earthquake loads.
2. Analysis found that a model with X-braced outriggers was most effective at reducing top storey displacement by 29.21% and maximum story drift by 26.64% compared to the bare frame model without outriggers. A model with a belt truss was also effective, reducing displacement by 34.57% and drift by 30.75%.
3. Steel outriggers provided the least benefit, reducing displacement by only
Analysis and Optimum Design for Steel Moment Resisting Frames to Seismic Exci...IJCMESJOURNAL
The essential purpose of this wander is to develop an Interior Penalty Function (IPF) based estimation to multi-storey steel traces for slightest weight of frames. The frames are proposed for contradicting even impact in view of seismic stacking close by gravity forces. Various structural stems are used for restricting seismic (lateral) forces; however steel moment resisting frames (MRFs) are considered for the present work. The framework solidifies codal courses of action of IS 800-2007, as needs be gets the edges with perfect weight for in-plane moments with lateral support of beam element. Strength and buckling criteria are considered as direct goals close by side constraints in formulating optimization problem. A Software program is made that uses an interior penalty function (IPF) for weight minimization of two-dimensional moment restricting steel encompassed structures. The program uses MATLAB, performs one dimensional interest, and structural design in an iterative technique. The design cases have exhibited that the proposed estimation gives a beneficial instrument to the practicing fundamental algorithm. The program is associated with 6 and 9 storey (4 bays) moment resisting frames (MRFs). The program showed its capacity of optimizing the largeness of two medium size frames. To get part obliges in frames an examination technique must be associated. In the present work Equivalent Lateral Force framework (ELF) and material nonlinear time history analysis (NTH) are associated and perfect qualities gained from both the examinations are contemplated.
IRJET- Experimental Investigation on Seismic Retrofitting of RCC StructuresIRJET Journal
This document summarizes an experimental investigation into seismic retrofitting of reinforced concrete beam-column joints using concrete jacketing. The study tested control specimens designed to code standards and retrofitted specimens with concrete jackets added. The specimens were subjected to reverse cyclic loading to examine their performance and lateral load capacity. The concrete jackets were intended to improve seismic performance by increasing strength, stiffness, deformation capacity, and connection integrity of the joints. The results provide information on the behavior and effectiveness of reinforced concrete beam-columns strengthened with concrete jacketing under cyclic loading conditions.
Lateral Load Analysis of a Building with & Without Knee BracingIJERA Editor
In last decades steel structures has played an important role in construction industry. Providing strength, stability
and ductility are major purposes of seismic design. It is necessary to design a structure to perform well under
seismic loads. Steel braced frame is one of the structural systems used to resist earthquake loads in structures.
Steel bracing is economical, easy to erect, occupies less space and has flexibility to design for meeting the
required strength and stiffness. Bracing can be used as retrofit as well. There are various types of steel bracings
such as Diagonal, X, K, V, inverted V type or chevron and global type concentric bracings. In the present study,
it was shown that modelling of the G+4 steel bare frame with various bracings (X, V, inverted V, and Knee
bracing) by computer software SAP2000 and pushover analysis results are obtained. Comparison between the
seismic parameters such as base shear, roof displacement, time period, storey drift, performance point for steel
bare frame with different bracing patterns are studied. It is found that the X type of steel bracings significantly
contributes to the structural stiffness and reduces the maximum interstate drift of steel building than other
bracing systems.
The document analyzes and designs a multi-cell post-tensioned pre-stressed concrete box girder bridge with a 35m span. Two different duct materials, HDPE and corrugated bright metal, are considered to determine the most economical design. Finite element modeling and analysis of the box girder is performed using CSI Bridge software. The design is done according to Indian code specifications, considering aspects such as section properties, load calculations, stress limits, prestressing calculations and loss estimates, and serviceability checks. Results for bending moments, shear forces, displacements and stresses are obtained and compared for both duct options.
Variation of deflection of steel high rise structure due to p- delta effect c...Yousuf Dinar
This document summarizes the results of a study that analyzed the effect of P-Delta on the deflection of steel high-rise structures considering global slenderness ratio. 40 different structural models were simulated with varying numbers of stories (7, 14, 20, 30) and bay dimensions to modify the slenderness. Both P-Delta analysis and linear static analysis were performed, and deflections were compared. P-Delta analysis resulted in significantly higher deflections than linear static analysis, especially as slenderness increased with taller buildings and smaller bays. Deflections at the top of each structure and for individual stories were evaluated. Results showed increasing deflections with P-Delta analysis as slenderness rose due to building height or
IRJET- Comparative Study of Different Bracing Systems in RCC Buildings using ...IRJET Journal
This document compares the seismic behavior of reinforced concrete buildings with different bracing systems using STAAD.Pro software. Four 15-story building models are analyzed: a moment resisting frame building and buildings with X-bracing, V-bracing, and diagonal bracing. The bracing systems are found to increase base shear and reduce story displacement compared to the non-braced building, indicating improved seismic performance. Of the braced buildings, the one with X-bracing performs best with the lowest displacements and highest base shear. The study concludes X-bracing is the most effective bracing system for seismic resistance of tall reinforced concrete buildings.
Performance Based Evaluation of Shear Walled RCC Building by Pushover AnalysisIJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessment…. And many more.
seismic response of multi storey building equipped with steel bracingINFOGAIN PUBLICATION
1) The document analyzes the seismic response of a multi-storey reinforced concrete building equipped with different steel bracing systems.
2) A 7-storey building model was created and linear analysis was conducted to compare the responses of an unbraced building model and models with X, V, and inverted V bracing systems.
3) The results showed that all bracing systems reduced displacement, drift, shear forces, and bending moments compared to the unbraced building, with the X bracing system providing the largest reductions in structural response.
Influence of Openings and Local Soil Conditions on the Seismic Behavior of Tu...IRJET Journal
The document analyzes the seismic behavior of tunnel form buildings using response spectrum analysis. Tunnel form buildings are reinforced concrete structures with relatively thin shear walls and flat slabs instead of beams and columns. The study models a 6-story RC wall building to analyze the effects of openings (0%, 6%, 22%, 50%) and soil conditions (bearing capacities of 50, 100, 200, 250) on seismic performance parameters like time period, displacement, drift, and base shear. Response spectrum analysis is performed using ETABS software according to Indian codes. Results show that RC wall buildings have significantly reduced time periods and displacements compared to equivalent RC frame buildings, indicating improved seismic performance.
Optimization of Cutting Parameters for Minimizing Cycle Time in Machining of ...IOSR Journals
This document describes an experimental study that optimized cutting parameters during machining of stainless steel SS 310 to minimize cycle time using Taguchi methodology and analysis of variance (ANOVA). The experiments were carried out using a CNC turning machine with coated carbide inserts. An L9 orthogonal array was used to test the effects of cutting speed, feed rate, and depth of cut on surface roughness and cycle time. ANOVA results showed that feed rate was the most significant factor for minimizing surface roughness, with higher feed rates providing higher surface roughness. The optimal cutting parameters for minimizing cycle time were also identified.
This document proposes a method for preventing cheating of messages based on block cipher using a digital envelope. It begins with an introduction to the need for data security during storage and transmission. It then discusses the AES encryption algorithm and related work involving encryption for wireless devices. The proposed method uses AES key expansion techniques to generate multiple keys for encryption and decryption of messages using a digital envelope, packing the encrypted message and key into a single packet. It claims this prevents attackers from accessing sensitive data. Future work could expand this to image encryption and decryption applications.
This document provides a literature review on aluminium-based metal matrix composites for aerospace applications. It discusses factors that affect the properties of Al-MMCs, including reaction at the interface, wettability, distribution of reinforcing materials, strengthening mechanisms, grain size, and fabrication methods. It also reviews studies on hybrid aluminium composites reinforced with multiple materials. The conclusion is that Al-MMC shows promise for aerospace due to its high strength-to-weight ratio, good ductility, corrosion and wear resistance. Proper consideration of interface reactions, reinforcement properties, and fabrication process is important to achieve optimal mechanical properties.
IRJET- Seismic Analysis of Steel Frame Building using Bracing in ETAB SoftwareIRJET Journal
This paper compares the seismic analysis of a G+11 square building and L-shaped building using time history analysis in ETAB 17.01 software. Different types of bracing systems are used, including X, V, inverted V, and diagonal bracing. The response of the buildings is compared in terms of displacement, base shear, and pseudo acceleration to determine which type of building and bracing system provides the minimum response. The L-shaped building with X bracing is found to have the minimum displacement, while the square building with X bracing has the minimum base shear and pseudo acceleration.
DESIGN AND ANALYSIS OF MULTI STORIED STRUCTURES USING STATIC NON LINEAR ANALYSISIjripublishers Ijri
In plan during the seismic excitation using nonlinear static analysis (pushover) have been performed on the
same structure. The literature pertaining to pushover analysis is reviewed. The pushover analysis adopted
in the present study is on similar lines with the procedure presented by Ashraf Habibullah and Stephen
Pyle using ETABS V 9.7 structural analysis software. The effect of earthquake force in a idealized G+4 story
building under maximum earthquake zone, with the help of pushover analysis has been investigated and
the results were compared in terms of base shear, displacement, spectral acceleration, spectral displacement
and effective damping and effective time period .to strengthen the symmetric and un symmetric RCC
framed buildings` steel braces are included by using retrofitting method.
This document summarizes a thesis analyzing the seismic performance of a 13-story building model with and without shear walls. Two models are considered: a bare frame structure and a shear wall frame structure. Both models are analyzed using ETABS software under wind and earthquake loading conditions in Seismic Zone III. The results show that the shear wall structure performs much better in terms of limiting lateral displacement, storey drift, and increasing stiffness and strength. It is concluded that the shear wall frame structure provides more reliable performance against lateral loads.
Analysis and design of shear wall transfer beam structurephamtraoag
The document analyzes the stress behavior of shear walls and transfer beams due to their interaction. It presents a finite element analysis of a 22-story building model consisting of shear walls, transfer beams, and columns. Two analyses are performed: 1) With vertical loads only to verify the stress behavior matches previous research. 2) With both wind loads and vertical loads to observe stress behavior differences and obtain results for transfer beam design. Based on the second analysis, the transfer beam reinforcement is designed according to CIRIA Guide 2:1977 design standards.
Seismic Analysis of G 10 Storey Building with Various Locations of Shear Wall...ijtsrd
Shear walls are specially designed structural members provided in the multi storey buildings to resist lateral forces. These walls have very high in plane strength and stiffness, which can resist large horizontal forces and can support gravity loads. There are lots of literatures available to design and analyse the shear wall. Ravi Kumar Vishwakarma | Vipin Kumar Tiwari "Seismic Analysis of G+10 Storey Building with Various Locations of Shear Walls using Etabs" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-4 , June 2021, URL: https://www.ijtsrd.compapers/ijtsrd43646.pdf Paper URL: https://www.ijtsrd.comengineering/structural-engineering/43646/seismic-analysis-of-g10-storey-building-with-various-locations-of-shear-walls-using-etabs/ravi-kumar-vishwakarma
This document presents the results of a pushover analysis conducted on 9 structural models with varying plan irregularities. The models were analyzed using ETABS software to determine key parameters such as lateral displacement, story drift, base shear, and performance point. The results show that structures with complex geometries experience greater lateral displacement, story drift, and base shear compared to regular structures. Pushover curves indicate that irregular structures may not achieve desired performance levels at lower displacement thresholds. In conclusion, simple and regular building geometries perform better during earthquakes by attracting fewer seismic forces.
Influence of Concrete and Steel Outrigger and Belt Truss in High Rise Moment ...IRJET Journal
1. The document analyzes 7 models of a 44-story reinforced concrete frame building with different outrigger and belt truss configurations to evaluate their effectiveness in reducing lateral displacement, storey drifts, base shear, and fundamental time periods under wind and earthquake loads.
2. Analysis found that a model with X-braced outriggers was most effective at reducing top storey displacement by 29.21% and maximum story drift by 26.64% compared to the bare frame model without outriggers. A model with a belt truss was also effective, reducing displacement by 34.57% and drift by 30.75%.
3. Steel outriggers provided the least benefit, reducing displacement by only
Analysis and Optimum Design for Steel Moment Resisting Frames to Seismic Exci...IJCMESJOURNAL
The essential purpose of this wander is to develop an Interior Penalty Function (IPF) based estimation to multi-storey steel traces for slightest weight of frames. The frames are proposed for contradicting even impact in view of seismic stacking close by gravity forces. Various structural stems are used for restricting seismic (lateral) forces; however steel moment resisting frames (MRFs) are considered for the present work. The framework solidifies codal courses of action of IS 800-2007, as needs be gets the edges with perfect weight for in-plane moments with lateral support of beam element. Strength and buckling criteria are considered as direct goals close by side constraints in formulating optimization problem. A Software program is made that uses an interior penalty function (IPF) for weight minimization of two-dimensional moment restricting steel encompassed structures. The program uses MATLAB, performs one dimensional interest, and structural design in an iterative technique. The design cases have exhibited that the proposed estimation gives a beneficial instrument to the practicing fundamental algorithm. The program is associated with 6 and 9 storey (4 bays) moment resisting frames (MRFs). The program showed its capacity of optimizing the largeness of two medium size frames. To get part obliges in frames an examination technique must be associated. In the present work Equivalent Lateral Force framework (ELF) and material nonlinear time history analysis (NTH) are associated and perfect qualities gained from both the examinations are contemplated.
IRJET- Experimental Investigation on Seismic Retrofitting of RCC StructuresIRJET Journal
This document summarizes an experimental investigation into seismic retrofitting of reinforced concrete beam-column joints using concrete jacketing. The study tested control specimens designed to code standards and retrofitted specimens with concrete jackets added. The specimens were subjected to reverse cyclic loading to examine their performance and lateral load capacity. The concrete jackets were intended to improve seismic performance by increasing strength, stiffness, deformation capacity, and connection integrity of the joints. The results provide information on the behavior and effectiveness of reinforced concrete beam-columns strengthened with concrete jacketing under cyclic loading conditions.
Lateral Load Analysis of a Building with & Without Knee BracingIJERA Editor
In last decades steel structures has played an important role in construction industry. Providing strength, stability
and ductility are major purposes of seismic design. It is necessary to design a structure to perform well under
seismic loads. Steel braced frame is one of the structural systems used to resist earthquake loads in structures.
Steel bracing is economical, easy to erect, occupies less space and has flexibility to design for meeting the
required strength and stiffness. Bracing can be used as retrofit as well. There are various types of steel bracings
such as Diagonal, X, K, V, inverted V type or chevron and global type concentric bracings. In the present study,
it was shown that modelling of the G+4 steel bare frame with various bracings (X, V, inverted V, and Knee
bracing) by computer software SAP2000 and pushover analysis results are obtained. Comparison between the
seismic parameters such as base shear, roof displacement, time period, storey drift, performance point for steel
bare frame with different bracing patterns are studied. It is found that the X type of steel bracings significantly
contributes to the structural stiffness and reduces the maximum interstate drift of steel building than other
bracing systems.
The document analyzes and designs a multi-cell post-tensioned pre-stressed concrete box girder bridge with a 35m span. Two different duct materials, HDPE and corrugated bright metal, are considered to determine the most economical design. Finite element modeling and analysis of the box girder is performed using CSI Bridge software. The design is done according to Indian code specifications, considering aspects such as section properties, load calculations, stress limits, prestressing calculations and loss estimates, and serviceability checks. Results for bending moments, shear forces, displacements and stresses are obtained and compared for both duct options.
Variation of deflection of steel high rise structure due to p- delta effect c...Yousuf Dinar
This document summarizes the results of a study that analyzed the effect of P-Delta on the deflection of steel high-rise structures considering global slenderness ratio. 40 different structural models were simulated with varying numbers of stories (7, 14, 20, 30) and bay dimensions to modify the slenderness. Both P-Delta analysis and linear static analysis were performed, and deflections were compared. P-Delta analysis resulted in significantly higher deflections than linear static analysis, especially as slenderness increased with taller buildings and smaller bays. Deflections at the top of each structure and for individual stories were evaluated. Results showed increasing deflections with P-Delta analysis as slenderness rose due to building height or
IRJET- Comparative Study of Different Bracing Systems in RCC Buildings using ...IRJET Journal
This document compares the seismic behavior of reinforced concrete buildings with different bracing systems using STAAD.Pro software. Four 15-story building models are analyzed: a moment resisting frame building and buildings with X-bracing, V-bracing, and diagonal bracing. The bracing systems are found to increase base shear and reduce story displacement compared to the non-braced building, indicating improved seismic performance. Of the braced buildings, the one with X-bracing performs best with the lowest displacements and highest base shear. The study concludes X-bracing is the most effective bracing system for seismic resistance of tall reinforced concrete buildings.
Performance Based Evaluation of Shear Walled RCC Building by Pushover AnalysisIJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
International Journal of Modern Engineering Research (IJMER) covers all the fields of engineering and science: Electrical Engineering, Mechanical Engineering, Civil Engineering, Chemical Engineering, Computer Engineering, Agricultural Engineering, Aerospace Engineering, Thermodynamics, Structural Engineering, Control Engineering, Robotics, Mechatronics, Fluid Mechanics, Nanotechnology, Simulators, Web-based Learning, Remote Laboratories, Engineering Design Methods, Education Research, Students' Satisfaction and Motivation, Global Projects, and Assessment…. And many more.
seismic response of multi storey building equipped with steel bracingINFOGAIN PUBLICATION
1) The document analyzes the seismic response of a multi-storey reinforced concrete building equipped with different steel bracing systems.
2) A 7-storey building model was created and linear analysis was conducted to compare the responses of an unbraced building model and models with X, V, and inverted V bracing systems.
3) The results showed that all bracing systems reduced displacement, drift, shear forces, and bending moments compared to the unbraced building, with the X bracing system providing the largest reductions in structural response.
Influence of Openings and Local Soil Conditions on the Seismic Behavior of Tu...IRJET Journal
The document analyzes the seismic behavior of tunnel form buildings using response spectrum analysis. Tunnel form buildings are reinforced concrete structures with relatively thin shear walls and flat slabs instead of beams and columns. The study models a 6-story RC wall building to analyze the effects of openings (0%, 6%, 22%, 50%) and soil conditions (bearing capacities of 50, 100, 200, 250) on seismic performance parameters like time period, displacement, drift, and base shear. Response spectrum analysis is performed using ETABS software according to Indian codes. Results show that RC wall buildings have significantly reduced time periods and displacements compared to equivalent RC frame buildings, indicating improved seismic performance.
Optimization of Cutting Parameters for Minimizing Cycle Time in Machining of ...IOSR Journals
This document describes an experimental study that optimized cutting parameters during machining of stainless steel SS 310 to minimize cycle time using Taguchi methodology and analysis of variance (ANOVA). The experiments were carried out using a CNC turning machine with coated carbide inserts. An L9 orthogonal array was used to test the effects of cutting speed, feed rate, and depth of cut on surface roughness and cycle time. ANOVA results showed that feed rate was the most significant factor for minimizing surface roughness, with higher feed rates providing higher surface roughness. The optimal cutting parameters for minimizing cycle time were also identified.
This document proposes a method for preventing cheating of messages based on block cipher using a digital envelope. It begins with an introduction to the need for data security during storage and transmission. It then discusses the AES encryption algorithm and related work involving encryption for wireless devices. The proposed method uses AES key expansion techniques to generate multiple keys for encryption and decryption of messages using a digital envelope, packing the encrypted message and key into a single packet. It claims this prevents attackers from accessing sensitive data. Future work could expand this to image encryption and decryption applications.
This document provides a literature review on aluminium-based metal matrix composites for aerospace applications. It discusses factors that affect the properties of Al-MMCs, including reaction at the interface, wettability, distribution of reinforcing materials, strengthening mechanisms, grain size, and fabrication methods. It also reviews studies on hybrid aluminium composites reinforced with multiple materials. The conclusion is that Al-MMC shows promise for aerospace due to its high strength-to-weight ratio, good ductility, corrosion and wear resistance. Proper consideration of interface reactions, reinforcement properties, and fabrication process is important to achieve optimal mechanical properties.
This document summarizes the evolution of wireless mobile communication systems from 1G to 5G. It discusses the key technologies and features of each generation. 1G systems used analog signals for voice calls. 2G introduced digital encryption and SMS. 3G enabled faster speeds and services like video calls and internet access. 4G provides further increased speeds up to 1Gbps and is based on LTE. 5G is expected to offer much higher speeds and bandwidth, near unlimited connectivity, low latency, and new applications through convergence of technologies like cloud computing and nanotechnology. It is predicted 5G will revolutionize wireless communications and be a major driver of social and economic development.
This paper proposes a method to integrate distributed generation (DG) from renewable energy sources into a distribution network to maximize the amount of DG power injected while maintaining bus voltages within limits. It uses optimal power flow analysis and a static synchronous compensator (STATCOM) for voltage control. Simulations on the IEEE 13-bus test system show the DG increases bus voltages closer to nominal levels compared to without DG integration. The STATCOM helps optimize the system by regulating voltages despite additional problems from high DG penetration.
This document presents a study on using PIDF auto-tuning to determine the parameters of a PIDF controller for an automatic voltage regulator (AVR) system to improve power system stability. A MATLAB GUI was developed to simulate a synchronous generator with an AVR. The PIDF controller provided better transient response than a conventional PID controller, with lower overshoot, rise time, and settling time. In conclusion, the PIDF controller enhanced system performance with minimal additional electronic components compared to the conventional AVR system.
Blind Signature Scheme Based On Elliptical Curve Cryptography (ECC)IOSR Journals
This document summarizes a blind signature scheme based on elliptic curve cryptography. It begins with an introduction to cryptography and the history of cryptography. It then discusses symmetric key cryptography, asymmetric key cryptography including public and private key pairs. It describes digital signatures, how they are generated and verified. It introduces the concept of blind signatures, how a message can be signed without revealing its contents to the signer. It discusses the mathematics behind elliptic curves and elliptic curve cryptography. It describes how to represent points on an elliptic curve and perform operations like point addition. The document focuses on implementing a blind digital signature scheme using elliptic curve cryptography.
This document summarizes a research study on the cultural factors that affect communication during the requirements engineering process in software development projects. The study used surveys and interviews of software professionals to investigate how factors like attitudes, language, roles, social organization, and time influence communication. The results showed that attitudes and language have the most significant impact on communication, while time, roles, and social organization have less influence. Miscommunication due to cultural differences can increase rework and delays. Understanding which cultural factors most affect communication can help minimize conflicts, reduce errors and rework, and ultimately decrease delays in the software development life cycle.
An Assessment on Food Security in Developing Economies-Problems and Policy In...IOSR Journals
This document discusses food security in developing economies and policy initiatives to address it. It begins by defining food security as access to sufficient nutritious food. Over 800 million people in developing countries lack adequate food. Food security indicators measure availability, access, and utilization. The FAO reported that in 2010-2012, almost 870 million people were undernourished, with higher rates in developing countries. India has added 30 million hungry people since the 1990s and 46% of children are underweight. The document examines food security challenges and measures in developing economies and the US, and initiatives by UN agencies to improve global food security.
Physical Fitness Index of Indian Judo Players assessed by Harvard step test.IOSR Journals
This study assessed the physical fitness index of 31 Indian judo players using the Harvard step test and compared it to 31 sedentary controls. The judo players were divided into two groups based on duration of training: Group A trained for 5 years or less, Group B trained for over 5 years. Group B showed a significantly higher physical fitness index than Group A. Both judo player groups had a higher index than the controls. A positive correlation was also found between physical fitness index and performance in a special judo fitness test, suggesting higher fitness is associated with better judo performance. The results indicate that longer training duration has a positive effect on physical fitness levels in judo players.
This document summarizes a research paper that explores using an Adaptive Neuro Fuzzy Inference System (ANFIS) to optimize the throughput of the Guaranteed Time Slot (GTS) mechanism in IEEE 802.15.4 wireless sensor networks. The GTS mechanism allows for time-critical data transmission but bandwidth utilization is reduced if packet arrival rates are low. The document outlines the IEEE 802.15.4 standard, its superframe structure and GTS mechanism. It then proposes using ANFIS to dynamically determine the number of packets to transmit based on packet interarrival time and data rate to improve GTS throughput.
1) The proposed method controls the RF communication module in wireless sensor nodes to periodically turn on and off to reduce power consumption compared to leaving it on continuously.
2) Experimental results showed there was no data loss with the periodic toggling and battery life was extended up to 12 times longer than systems without toggling.
3) In addition to the RF module toggling, the paper discusses energy-conserving strategies for wireless sensor networks including finding minimum cover sets of sensor nodes to maintain coverage and opportunistically selecting active sensor nodes using randomization.
This document presents a novel 15-level smart inverter topology for integrating renewable energy sources like photovoltaic cells and fuel cells into microgrids. It proposes two asymmetric multilevel inverter topologies (Topologies I and II) that can generate 15 voltage levels using fewer switches than traditional topologies. Topology I uses 10 switches to generate 15 levels, while Topology II uses only 7 switches. The topologies are controlled using various intelligent controllers to optimize switching states and produce high quality output voltages synchronized with the grid. Simulation results in Matlab/Simulink validate the performance of the proposed topologies.
This document summarizes a smart car collision avoidance system that uses GPS technology and vehicle-to-vehicle communication to help prevent accidents caused by overtaking. The system determines the position, speed, and direction of nearby vehicles and alerts the driver if an oncoming vehicle comes within 50 meters. It displays speed and distance for vehicles further away. The system was developed using a GPS module, myRIO controller, and LabVIEW software to calculate distance and speed between vehicles from GPS data and warn the driver or display information as needed to help avoid collisions during overtaking maneuvers.
This document discusses methods for migrating applications from on-premise systems to cloud computing environments. It begins by introducing cloud computing and describing the common cloud service models of infrastructure as a service (IaaS), platform as a service (PaaS), and software as a service (SaaS). The document then analyzes existing migration methods and strategies, dividing them into migrating to IaaS, PaaS, or SaaS. It proposes an architecture for the cloud migration process, starting with understanding the application architecture, choosing a cloud environment type, and identifying migration approaches. Finally, it reviews existing research on comparing different migration strategies.
This document discusses using fuzzy set theory and decision trees to predict student performance. It proposes using fuzzy sets to represent numeric student data like test scores and attendance to allow for imprecise values. A decision tree is generated on this fuzzy data set to classify students as passing or failing. The fuzzy decision tree achieves an accuracy of 81.5% compared to 76% for a non-fuzzy decision tree, indicating fuzzy sets improve predictive performance. Location, attendance, and prior academic performance were identified as important factors impacting student results.
Face Image Restoration based on sample patterns using MLP Neural NetworkIOSR Journals
This document presents a face image restoration method using MLP neural networks. Low resolution face images are generated from a high resolution image using an observation model. Patches are extracted from the high and low resolution images and used to train an MLP network. After training, the model can be used to restore low resolution images. The method is tested on images from the ORL database. Results show the proposed method has better performance than other methods in terms of statistical metrics and visual quality, especially when there are only geometric changes between images. When noise levels are varied, performance decreases.
This document discusses social media and comment volume prediction. It begins by providing background on the rise of social media and its various functional blocks like identity, conversations, sharing, and relationships. It then examines the importance of user comments in influencing people's perceptions and trending topics. Different techniques for predicting comment volume are discussed. The document aims to review approaches for comment volume prediction that have been proposed in previous literature.
Male and female rats were exposed to mercury (0.5, 1.0 and 1.5mg/kg) for 12 weeks to investigate the effects on antioxidant enzymes. Mercury exposure inhibited antioxidant enzymes like catalase and superoxide dismutase in a gender-specific manner. In female rats, mercury inhibited catalase and superoxide dismutase in the plasma, erythrocytes, liver and kidneys. In male rats, mercury inhibited superoxide dismutase in the liver and catalase in the kidneys. Mercury levels in tissues correlated negatively with antioxidant enzyme levels, specifically in females. The findings support that mercury exposure affects antioxidant defenses differently between males and females.
This document summarizes research on using ultraviolet (UV) light to inactivate Escherichia coli (E. coli) bacteria in water. The research tested water samples from three locations in Ambazari Lake in India over different seasons. Testing measured physio-chemical parameters like turbidity, pH, and hardness, as well as E. coli levels before and after UV treatment. Results found physio-chemical parameters within standards, and over 99.999% reduction in E. coli after UV exposure times from 0.5 to 8 hours depending on initial bacterial levels and water quality. The research concluded UV light is an effective alternative to chlorine for water disinfection, avoiding harmful chlorination byproducts, though pre-
A Review of “Seismic Response of RC Structures Having Plan and Vertical Irreg...IRJET Journal
This document summarizes and reviews a research paper on the seismic response of reinforced concrete (RC) structures with plan and vertical irregularities, with and without infill walls. It discusses how infill walls can improve or reduce the seismic performance of RC buildings, depending on factors like wall layout, height distribution, connection to the frame, and relative stiffness of walls and frames. The reviewed research paper analyzes the behavior of infill walls, effects of vertical irregularities, and seismic performance of high-rise structures under linear static and dynamic analysis. It studies response characteristics like story drift, deflection and shear. The document also provides literature on similar research investigating the effects of infill walls, soft stories, plan irregularities, and different
Seismic Behavior of Steel Frame Structure with and Without BracingIRJET Journal
This document summarizes a study on the seismic behavior of steel frame structures with and without bracing. A 21-story steel building model was analyzed using ETABS software under seismic zone III conditions with different soil types. The building's plan was 35m x 35m with a floor height of 3.2m. Response spectrum analysis was used to analyze the building with different bracing configurations including X, V, inverted V, and without bracing. Story drift, displacement, and base shear were compared for each configuration. The results showed that braced frames had reduced drift and displacement compared to unbraced frames, with X-bracing performing most efficiently. Bracing improved the seismic performance of steel structures by increasing their lateral stiffness
Finite Element Modeling of a Multi-Storeyed Retrofitted Reinforced Concrete F...IOSR Journals
In the present study, the non-linear response of RC frame using FE modeling under the incremental
loading has been carried out in the first phase of analysis to study the response and load-carrying capacity of a
four storeyed RC frame using non-linear finite element analysis. In the second phase of study an analysis model
for retrofitted RC frame using finite element method using software ATENA is presented. The results obtained
from FE analysis in both cases are compared with the experimental data for four storeyed RC frame tested by
BARC at CPRI. The results from finite element analysis were calculated at the same location as used in
experimental test. The accuracy of the finite element model is assessed by the comparison with experimental
results which are to be in good agreement. The base shear/ displacement curves from finite element analysis
agree well with the experimental results in linear range. The maximum difference in base shear is observed to
be 7.9%
IRJET- A Study on Seismic Performance of Reinforced Concrete Frame with L...IRJET Journal
This document presents a study on the seismic performance of a 10-storey reinforced concrete frame with different lateral force resistant systems, including a base isolation system using lead rubber bearings. Three models of the frame were analyzed: fixed base, braced with X-bracing, and base isolated. Time history, static, and pushover analyses were conducted. The results show that the base isolated frame performed best in reducing story drift, displacement, shear, and acceleration under seismic loading compared to the fixed base and braced frames. Maximum drift was 0.415mm for the base isolated frame versus 26.62mm for the fixed base frame. The base shear was also significantly reduced from 2294.3kN to 32.935
IRJET- Improvement in Seismic Performance of Multistoried Building using Meta...IRJET Journal
The document discusses improving the seismic performance of multi-story reinforced concrete buildings through the addition of metallic bracing systems. It presents the results of a study that modeled a 7-story reinforced concrete building in the software SAP 2000 with different bracing configurations, including X, V, diagonal, and inverted V patterns. Non-linear dynamic time history analyses were performed using ground motion records to analyze the performance and response of each braced model in terms of story displacement and drift. The results showed that all braced models had improved seismic performance compared to the unbraced model, with bracing helping to dissipate seismic energy and reduce structural damage through inelastic yielding and buckling of the brace members.
A THEORETICAL STUDY ON COLLAPSE MECHANISM AND STRUCTURAL BEHAVIOR OF MULTI-ST...nhandoan10
This document presents a theoretical study on the collapse mechanism and structural behavior of multi-story reinforced concrete (RC) frames subjected to earthquake loading. A nonlinear finite element analysis was utilized to investigate the behavior and collapse mechanism. Plastic hinges were assumed to occur when steel yields or concrete reaches ultimate strength. The behavior of RC frames was investigated focusing on propagation of plastic hinges with varying numbers of stories, concrete grades, and reinforcement ratios, under three earthquake motions. Parameters like member rotations, hinge formation times, maximum shear and displacements were examined. Several conclusions were drawn regarding plastic hinge behavior and design of RC frames under seismic loads.
Comparative Study of Post Tensioned and RCC Flat Slab in Multi-Storey Commerc...IRJET Journal
This document compares post-tensioned flat slabs to reinforced concrete (RCC) flat slabs in multi-story commercial buildings. It finds that post-tensioned flat slabs are more cost effective than RCC slabs. The document reviews literature on flat slab design and seismic behavior. It also presents the benefits of post-tensioning, including larger spans, reduced dead loads, smaller columns and foundations, and the ability to incorporate additional floors in a given building height. Analysis using RAPT and ETABS software indicates that post-tensioned flat slabs require less reinforcing steel, post-tensioning steel, and concrete, resulting in lower overall building costs per square meter compared to RCC slab systems.
Descriptive study of pushover analysis in rcc structures of rigid jointYousuf Dinar
ABSTRACT: Structures in mega cities, are under serious threat because of faulty and unskilled design and construction of structures. Sometimes structure designers are more concerned in constructing different load resistant members without knowing its necessity and its performance in the structure. Different configuration of construction may also lead to significant variation in capacity of the same structure. Nonlinear static pushover analysis provides a better view on the performance of the structures during seismic events. This comprehensive research evaluates as well as compares the performances of bare, different infill percentage level, different configuration of soft storey and Shear wall consisting building structures with each other and later depending upon the findings, suggests from which level of performance shear wall should be preferred over the infill structure and will eventually help engineers to decide where generally the soft storey could be constructed in the structures. Above all a better of effects of pushover analysis could be summarized from the findings. Masonry walls are represented by equivalent strut according to pushover concerned codes. For different loading conditions, the performances of structures are evaluated with the help of performance point, base shear, top displacement, storey drift and stages of number of hinges form.
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Analysis and Optimum Design for Steel Moment Resisting Frames to Seismic Exci...IJCMESJOURNAL
The essential purpose of this wander is to develop an Interior Penalty Function (IPF) based estimation to multi-storey steel traces for slightest weight of frames. The frames are proposed for contradicting even impact in view of seismic stacking close by gravity forces. Various structural stems are used for restricting seismic (lateral) forces; however steel moment resisting frames (MRFs) are considered for the present work. The framework solidifies codal courses of action of IS 800-2007, as needs be gets the edges with perfect weight for in-plane moments with lateral support of beam element. Strength and buckling criteria are considered as direct goals close by side constraints in formulating optimization problem. A Software program is made that uses an interior penalty function (IPF) for weight minimization of two-dimensional moment restricting steel encompassed structures. The program uses MATLAB, performs one dimensional interest, and structural design in an iterative technique. The design cases have exhibited that the proposed estimation gives a beneficial instrument to the practicing fundamental algorithm. The program is associated with 6 and 9 storey (4 bays) moment resisting frames (MRFs). The program showed its capacity of optimizing the largeness of two medium size frames. To get part obliges in frames an examination technique must be associated. In the present work Equivalent Lateral Force framework (ELF) and material nonlinear time history analysis (NTH) are associated and perfect qualities gained from both the examinations are contemplated.
The document reviews literature on the optimization of steel frames, moment resisting frames, and buckling restrained braced frames. It discusses several past studies that used optimization techniques and linear/nonlinear analysis methods to minimize weight and seismic response of steel structures. Key findings from experimental testing of buckling restrained braces are also summarized, including the importance of ensuring a ratio of tube buckling strength to core yield strength above 1.5 to prevent global buckling.
Study of Eccentrically Braced Outrigger Frame under Seismic ExitationIJTET Journal
Outrigger braced structures has efficient structural form consist of a central core, comprising braced frames with
horizontal cantilever ”outrigger” trusses or girders connecting the core to the outer column. When the structure is loaded
horizontally, vertical plane rotation of the core is restrained by the outriggers through tension in windward column and
compression in leeward column. The effective structural depth of the building is greatly increased, thus augmenting the lateral
stiffness of the building and reducing the lateral deflections and moments in core. In effect, the outriggers join the columns to the
core to make the structure behave as a partly composite cantilever. By providing eccentrically braced system in outrigger frame by
varying the size of links and analyzing it. Push over analysis is carried out by varying the link size using computer programs, Sap
2007 to understand their seismic performance. The ductile behavior of eccentrically braced frame is highly desirable for structures
subjected to strong ground motion. Maximum stiffness, strength, ductility and energy dissipation capacity are provided by
eccentrically braced frame. Studies were conducted on the use of outrigger frame for the high steel building subjected to
earthquake load. Braces are designed not to buckle, regardless of the severity of lateral loading on the frame. Thus eccentrically
braced frame ensures safety against collapse.
SEISMIC RESPONSE OF EXISTING RC BUILDING UNDER REVISED SEISMIC ZONE CLASSIFIC...IAEME Publication
This document summarizes a research paper that analyzes an existing 7-story reinforced concrete building using pushover analysis under old and revised seismic zone classifications. The building was originally designed according to older seismic code provisions. Pushover analysis was conducted in both directions to obtain capacity curves and identify plastic hinge locations. The results show the building can withstand seismic forces with some yielding, providing insight into its real behavior. Comparing demand and capacity points indicates the building's expected performance under different seismic codes.
Out of Plane Behavior of Contained Masonry Infilled Frames Subjected to Seism...paperpublications3
The document discusses the out-of-plane behavior of reinforced concrete (RC) frames with contained masonry infill subjected to seismic forces. It presents results from a finite element analysis of RC frames with different configurations: bare frames, frames with plain masonry infill, and frames with contained masonry infill wrapped in steel wires. The analysis determined the natural frequencies of the frames under different configurations and aspect ratios. It found that frames with contained masonry infill had the highest natural frequencies, followed by frames with plain masonry infill, with bare frames having the lowest natural frequencies.
A Study of R. C. C. Beam Column Junction Subjected To QuasiStatic (Monotonic)...IOSR Journals
This document summarizes a study on reinforced concrete beam-column junctions subjected to quasi-static (monotonic) loading. The study analyzes parameters like stress, displacement, and joint stiffness. Previous research on corner and exterior beam-column joints under cyclic loading is reviewed. The behavior of exterior joints differs from corner joints. Finite element analysis is used to model the joints, and results are compared to experimental data. Design and performance criteria for beam-column joints in seismic regions are discussed. Joint shear strength and bond strength are important factors addressed in the design process.
Dynamic Response of High Rise Structures Under The Influence of Shear WallsIJERA Editor
This study presents the procedure for seismic performance estimation of high-rise buildings based on a concept of the capacity spectrum method. In 3D analytical model of thirty storied buildings have been generated for symmetric buildings Models and analyzed using structural analysis tool ETABS. The analytical model of the building includes all important components that influence the mass, strength, stiffness and deformability of the structure. To study the effect of concrete core wall & shear wall at different positions during earthquake, seismic analysis using both linear static, linear dynamic and non-linear static procedure has been performed. The deflections at each storey level has been compared by performing Equivalent static, response spectrum method as well as pushover method has also been performed to determine capacity, demand and performance level of the considered building models. From the below studies it has been observed that non-linear pushover analysis provide good estimate of global as well as local inelastic deformation demands and also reveals design weakness that may remain hidden in an elastic analysis and also the performance level of the structure. Storey drifts are found within the limit as specified by code (IS: 1893-2002) in Equivalent static, linear dynamic & non-linear static analysis.
IRJET- A Study on Effect of LRB Isolators on Varying Height of Rectangula...IRJET Journal
This document analyzes the effect of using lead rubber bearing (LRB) isolators on structures of varying heights when subjected to seismic activity. Non-linear time history analyses were conducted on 4, 10, 15, and 20-story rectangular reinforced concrete structures both with and without LRB isolators. The results showed that using LRB isolators significantly reduced story rotation, acceleration, displacement, and drift across all building heights compared to fixed-base structures. Additionally, LRB isolators increased the natural period of the structures, which decreased the lateral forces experienced. In conclusion, seismic isolation through the use of LRB isolators improved the performance of structures and was more effective at mitigating earthquake effects in taller buildings.
IRJET-A Comparative Study of RC Column and Composite Column with Flat Slab Sy...IRJET Journal
This document presents a comparative study of linear static analysis and construction sequential analysis (CSA) for reinforced concrete (RC) column structures and composite column structures with flat slabs. The analysis is performed using ETABS software for different earthquake zones in India. Results show that CSA provides more accurate results than linear static analysis by considering the staged construction and varying loads. Base shear values from CSA models differ from linear static models by 100-200kN for composite columns. Composite column structures exhibit higher storey stiffness, shorter time periods, and require smaller column sizes compared to RC column structures. In conclusion, CSA should be used for multi-storey buildings to improve analysis accuracy regarding displacements, forces and stresses at different construction
Optimum participation of beams and columns in lateral resistance of steel mom...Alexander Decker
This document discusses optimizing the participation of beams and columns in providing lateral resistance in steel moment frames. It presents research on five steel moment frames with varying numbers of stories and bays. The frames were modeled in ETABS2000 software and subjected to earthquake loads. The research aims to determine the optimum ratio of story drift to maximum allowable drift, based on the ratio of beam and column flexural stiffness. It found that increasing the flexural stiffness of columns, while keeping beam stiffness constant, reduced lateral displacement and brought story drift within allowable limits. Controlling the ratio of beam and column stiffness provides a way to optimize lateral frame resistance and displacement.
Study on Seismic Behaviour of RC Frame Vertically Asymmetrical BuildingsIRJET Journal
This document discusses the seismic behavior of vertically asymmetrical reinforced concrete (RC) frame buildings. It begins with an abstract that introduces the topic and defines key terms like balanced, irregular, and vertical irregularity. The introduction provides more context, explaining that structural failure often occurs at points of weakness during earthquakes, like discontinuities in mass, stiffness, and geometry. These types of irregular structures are common in urban areas. The document then reviews the current research status on modeling different types of vertically irregular buildings, like open ground storey buildings, and analyzing them using equivalent static analysis and response spectrum analysis. It also describes the experimental procedure for conducting seismic analysis on these structures using various modeling and analysis techniques.
This document provides a technical review of secure banking using RSA and AES encryption methodologies. It discusses how RSA and AES are commonly used encryption standards for secure data transmission between ATMs and bank servers. The document first provides background on ATM security measures and risks of attacks. It then reviews related work analyzing encryption techniques. The document proposes using a one-time password in addition to a PIN for ATM authentication. It concludes that implementing encryption standards like RSA and AES can make transactions more secure and build trust in online banking.
This document analyzes the performance of various modulation schemes for achieving energy efficient communication over fading channels in wireless sensor networks. It finds that for long transmission distances, low-order modulations like BPSK are optimal due to their lower SNR requirements. However, as transmission distance decreases, higher-order modulations like 16-QAM and 64-QAM become more optimal since they can transmit more bits per symbol, outweighing their higher SNR needs. Simulations show lifetime extensions up to 550% are possible in short-range networks by using higher-order modulations instead of just BPSK. The optimal modulation depends on transmission distance and balancing the energy used by electronic components versus power amplifiers.
This document provides a review of mobility management techniques in vehicular ad hoc networks (VANETs). It discusses three modes of communication in VANETs: vehicle-to-infrastructure (V2I), vehicle-to-vehicle (V2V), and hybrid vehicle (HV) communication. For each communication mode, different mobility management schemes are required due to their unique characteristics. The document also discusses mobility management challenges in VANETs and outlines some open research issues in improving mobility management for seamless communication in these dynamic networks.
This document provides a review of different techniques for segmenting brain MRI images to detect tumors. It compares the K-means and Fuzzy C-means clustering algorithms. K-means is an exclusive clustering algorithm that groups data points into distinct clusters, while Fuzzy C-means is an overlapping clustering algorithm that allows data points to belong to multiple clusters. The document finds that Fuzzy C-means requires more time for brain tumor detection compared to other methods like hierarchical clustering or K-means. It also reviews related work applying these clustering algorithms to segment brain MRI images.
1) The document simulates and compares the performance of AODV and DSDV routing protocols in a mobile ad hoc network under three conditions: when users are fixed, when users move towards the base station, and when users move away from the base station.
2) The results show that both protocols have higher packet delivery and lower packet loss when users are either fixed or moving towards the base station, since signal strength is better in those scenarios. Performance degrades when users move away from the base station due to weaker signals.
3) AODV generally has better performance than DSDV, with higher throughput and packet delivery rates observed across the different user mobility conditions.
This document describes the design and implementation of 4-bit QPSK and 256-bit QAM modulation techniques using MATLAB. It compares the two techniques based on SNR, BER, and efficiency. The key steps of implementing each technique in MATLAB are outlined, including generating random bits, modulation, adding noise, and measuring BER. Simulation results show scatter plots and eye diagrams of the modulated signals. A table compares the results, showing that 256-bit QAM provides better performance than 4-bit QPSK. The document concludes that QAM modulation is more effective for digital transmission systems.
The document proposes a hybrid technique using Anisotropic Scale Invariant Feature Transform (A-SIFT) and Robust Ensemble Support Vector Machine (RESVM) to accurately identify faces in images. A-SIFT improves upon traditional SIFT by applying anisotropic scaling to extract richer directional keypoints. Keypoints are processed with RESVM and hypothesis testing to increase accuracy above 95% by repeatedly reprocessing images until the threshold is met. The technique was tested on similar and different facial images and achieved better results than SIFT in retrieval time and reduced keypoints.
This document studies the effects of dielectric superstrate thickness on microstrip patch antenna parameters. Three types of probes-fed patch antennas (rectangular, circular, and square) were designed to operate at 2.4 GHz using Arlondiclad 880 substrate. The antennas were tested with and without an Arlondiclad 880 superstrate of varying thicknesses. It was found that adding a superstrate slightly degraded performance by lowering the resonant frequency and increasing return loss and VSWR, while decreasing bandwidth and gain. Specifically, increasing the superstrate thickness or dielectric constant resulted in greater changes to the antenna parameters.
This document describes a wireless environment monitoring system that utilizes soil energy as a sustainable power source for wireless sensors. The system uses a microbial fuel cell to generate electricity from the microbial activity in soil. Two microbial fuel cells were created using different soil types and various additives to produce different current and voltage outputs. An electronic circuit was designed on a printed circuit board with components like a microcontroller and ZigBee transceiver. Sensors for temperature and humidity were connected to the circuit to monitor the environment wirelessly. The system provides a low-cost way to power remote sensors without needing battery replacement and avoids the high costs of wiring a power source.
1) The document proposes a model for a frequency tunable inverted-F antenna that uses ferrite material.
2) The resonant frequency of the antenna can be significantly shifted from 2.41GHz to 3.15GHz, a 31% shift, by increasing the static magnetic field placed on the ferrite material.
3) Altering the permeability of the ferrite allows tuning of the antenna's resonant frequency without changing the physical dimensions, providing flexibility to operate over a wide frequency range.
This document summarizes a research paper that presents a speech enhancement method using stationary wavelet transform. The method first classifies speech into voiced, unvoiced, and silence regions based on short-time energy. It then applies different thresholding techniques to the wavelet coefficients of each region - modified hard thresholding for voiced speech, semi-soft thresholding for unvoiced speech, and setting coefficients to zero for silence. Experimental results using speech from the TIMIT database corrupted with white Gaussian noise at various SNR levels show improved performance over other popular denoising methods.
This document reviews the design of an energy-optimized wireless sensor node that encrypts data for transmission. It discusses how sensing schemes that group nodes into clusters and transmit aggregated data can reduce energy consumption compared to individual node transmissions. The proposed node design calculates the minimum transmission power needed based on received signal strength and uses a periodic sleep/wake cycle to optimize energy when not sensing or transmitting. It aims to encrypt data at both the node and network level to further optimize energy usage for wireless communication.
This document discusses group consumption modes. It analyzes factors that impact group consumption, including external environmental factors like technological developments enabling new forms of online and offline interactions, as well as internal motivational factors at both the group and individual level. The document then proposes that group consumption modes can be divided into four types based on two dimensions: vertical (group relationship intensity) and horizontal (consumption action period). These four types are instrument-oriented, information-oriented, enjoyment-oriented, and relationship-oriented consumption modes. Finally, the document notes that consumption modes are dynamic and can evolve over time.
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K012116773
1. IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE)
e-ISSN: 2278-1684,p-ISSN: 2320-334X, Volume 12, Issue 1 Ver. I (Jan- Feb. 2015), PP 67-73
www.iosrjournals.org
DOI: 10.9790/1684-12116773 www.iosrjournals.org 67 | Page
Seismic Performance Assessment of RCS Building By Pushover
Analysis
Ashraf. E. Morshed1
Associate Professor of Civil Engineering, Housing and Building National Research Center Cairo, Egy.
Abstract: RCS moment-resisting frame systems, consisting of Reinforced Concrete (RC) columns and Steel (S)
beams, take advantage of the inherent stiffness and damping, as well as low-cost of concrete, the lightweight
and construction efficiency of structural steel. Past studies have shown these systems to be efficient in both
design and construction stages while able to maintain sufficient strength and ductility necessary in seismic
applications. Despite this past research, use of this hybrid structural system in the United States has been
limited to non- or low-seismic zones. In addition, past studies have acknowledged that there is a fundamental
need to test full structural systems, both analytically and experimentally, in order to (1) substantiate the
knowledge that has accumulated up to this point and (2) act as a proof of concept for the composite RCS
frames. This paper aim to facilitate the greater acceptance and use of composite RCS systems as a viable
alternative to conventional lateral resisting systems in comparison with the ordinary RC building.
Two structures are considered to represent low rise RCS and RC structures for study. Theses consist of two
typical steel beam and RC columns frame buildings without shear walls. Three story RCS buildings is designed
according to EGP Codes of practice. Design columns under provisions of Egyptian reinforced concrete
structures code and beams are designed according to Egyptian steel construction code. The comparative studies
for the two buildings are presented.
Keyword: Seismic assessment, Pushover, RCS system, Moment resisting frame
I. Introduction
Innovative applications of composite steel and concrete structures provide attractive alternatives to
conventional steel or reinforced concrete systems. RCS moment-resisting frame systems, consisting of
Reinforced Concrete (RC) columns and Steel (S) beams, take advantage of the inherent stiffness and damping,
as well as low-cost of concrete, and the lightweight and construction efficiency of structural steel (Liang et al
2004)
RCS frame systems have shown to possess several advantages from economic and construction
viewpoints (Griffis 1986) compared to either RC or steel frame systems. RC columns are approximately 10
times more cost-effective than steel columns in terms of axial strength and stiffness (Sheikh et al 1987). On the
other hand, steel floor systems are significantly lighter compared to RC floor systems, leading to substantial
reductions in the weight of the building, foundation costs, and inertial forces. From the construction viewpoint,
RCS buildings are generally built by first erecting a steel skeleton with light columns, which for medium- or
high-rise buildings could be as high as 8 to 10 stories. This steel frame then allows the simultaneous
performance of several construction tasks at different floor levels, such as placing of steel deck, pouring of
concrete slabs, and encasement of the light steel columns by RC columns (Griffis 1986).
In the past thirty years, RCS moment-resisting frame systems have mostly used for high-rise buildings
located in regions of low seismicity. In recent years, research efforts have made to develop seismic design
guidelines for RCS systems located in regions of high seismic risk (Liang et al 2004)
Several groups of researchers have developed trial designs of RCS frames based on a common theme
building devised for the US-Japan program (Mehanny 2000, Bugeja 1999, Noguchi 1998). These studies apply
the proposed seismic design provisions for RCS systems and then evaluate the seismic performance of resulting
designs using nonlinear analyses and advanced performance assessment techniques. Traditional steel frames
were also investigated in these studies to benchmark the performance of conventional frames compared to the
composite RCS frames. Using a common floor plan, the building heights varied as well as the implementation
of perimeter versus space frame systems. These design studies have shown that the steel beam sizes tend to be
similar for the RCS and steel system and that the main differences lie in the column and connection designs.
Given the additional stiffness provided by the RC columns, the RCS frames tended to be controlled more by the
minimum strength requirements whereas the steel frames were restricted by lateral drift limitations. In general,
these investigations have shown that the inelastic dynamic response of the RCS frames is similar to comparably
designed steel moment frames.
The US-Japan program included two reduced-scale RCS moment frames – one at the Osaka Institute of
Technology (Baba and Nishirmura 2000) and the second at Chiba University (Noguchi and Uchida 2004). Both
are about 1/3-scale two-bay two-story RCS frames with through-beam type connections with differences only in
2. Seismic performance assessment of rcs building by pushover analysis
DOI: 10.9790/1684-12116773 www.iosrjournals.org 68 | Page
the joint details (one had cover plates and band plates while the other had face bearing plates and band plates).
The frame was designed such that the plastic strength of the beams was nearly equal to the ultimate shear
strength of the joints, so as to provide information on the interaction between frame and connection response.
Both test specimens were subjected to reverse cyclic loading and withstood story drift ratios in excess of 5%
without significant strength or stiffness degradation, thus confirming the reliable seismic behavior of RCS
framing systems.
Cordova et al 2005 design, and test a full scale 3-story composite RCS moment frame. Using the
pseudo-dynamic loading technique, this specimen is subjected to a series of earthquake motions ranging in
hazards from frequent to extremely rare events. Using the results of the test specimens and recommendation,
trial designs of three case study buildings (3, 6, and 20-stories) are generated, analytically modeled, and
subjected to a suite of earthquake ground motions at a range of hazard levels. They Investigate differences
between the response of beam-column subassembly and full-scale system testing and evaluate how this affects
the interpretations from these tests.
One of the efficient tool of addressing the behaviour of building under earthquake loading is the
pushover analysis. Due its simplicity, the structural engineering profession has been using the nonlinear static
procedure or pushover analysis. It is widely accepted that, when push over analysis is used carefully it provide
useful information that cannot be obtained by linear static or dynamic analysis procedure (mehmet inel et al
(2006).
This paper aim to study the seismic performance of the RCS system for buildings in comparison with
the ordinary RC buildings.
II. Pushover Analysis
Structures are expected to deform inelastically when subjected to severe earthquakes, so seismic
performance evaluation of structures should be conducted considering post-elastic behavior. Therefore, a
nonlinear analysis procedure must be used for evaluation purpose as post-elastic behavior can not be determined
directly by an elastic analysis. Moreover, maximum inelastic displacement demand of structures should be
determined to adequately estimate the seismically induced demands on structures that exhibit inelastic behavior.
Pushover analysis is an analysis method in which the structure is subjected to monotonically increasing
lateral forces with an invariant height-wise distribution until a target displacement is reached. Pushover analysis
consists of a series of sequential elastic analyses, superimposed to approximate a force-displacement curve of
the overall structure. A two or three dimensional model which includes bilinear or trilinear load-deformation
diagrams of all lateral force resisting elements is first created and gravity loads are applied initially.
A predefined lateral load pattern which is distributed along the building height is then applied. The
lateral forces are increased until some members yield. The structural model is modified to account for the
reduced stiffness of yielded members and lateral forces are again increased until additional members yield. The
process is continued until a control displacement at the top of building reaches a certain level of deformation or
structure becomes unstable. The roof displacement is plotted with base shear to get the capacity curve (Fig 1).
The pushover analysis is very useful in estimating the following characteristics of a structure. M.
Mouzzoun (2013)
1- The capacity of the structure as represented by the base shear versus roof- displacement graph
2- Maximum rotation and ductility of critical members load
3- The distribution of plastic hinges at the ultimate load
4- The distribution of damage in the structure, as expressed in the from of load damage indices, at the ultimate
load
5- Determination of the yield lateral resistance of the structure
6- Estimates of inter-story drifts and its distribution along the height
7- Determination of force demands on members, such as axial force demands on columns, moment demands
on beam-column connections
8- To assess the structural performance of existing or retrofitted buildings.
III. Seismic Perforamnace Assessment Of Buildings
The seismic performance of buildings is measured by the state of damage under a certain level of
seismic hazard. The state of damage is quantified by the drift of the roof and the displacement of the structural
elements. Initially, gravity push is carried out using force control method. It is followed by lateral push with
displacement control using commercial programs as SAP2000.
For carrying out displacement based pushover analysis, target displacement need to be defined.
Pushover analysis gives an insight into the maximum base shear that the structure is capable of resisting. A
building performance level is a combination of the performance levels of the structure and the nonstructural
components. A performance level describes a limiting damage condition, which may be considered satisfactory
for a given building with specific ground motion. The performance of the structure is determined by hinges
3. Seismic performance assessment of rcs building by pushover analysis
DOI: 10.9790/1684-12116773 www.iosrjournals.org 69 | Page
formation. Various types of plastic hinges: uncoupled/coupled moment, torsion, axial force and shear hinges are
available. After yielding, plastic hinges will form at different location indicating the risk of occupant as shown
in the (Fig. 2 and Fig. 3). The performance point is calculated from the guideline defined in FEMA-356 and
ATC-40. The lateral force is applied at the deformed state of the general loading from point A (Fig. 2). No
hinges will formed before point B where structure will shows linear behavior and after that one or more hinges
will start to form. Software will shows hinges with following remarkable indication:
Immediate occupancy IO: damage is relatively limited; the structure retains a significant portion of its original
stiffness and most if not all of its strength.
Life safety level LS: substantial damage has occurred to the structure, and it may have lost a
significant amount of its original stiffness. However, a substantial margin remains for additional lateral
deformation before collapse would occur.
Collapse prevention CP: at this level the building has experienced extreme damage, if laterally deformed
beyond this point; the structure can experience instability and collapse base shear.
Fig.1 Expected Capacity Curve of the frame element
Fig.2 Risk indicator curve
Fig.3 FEMA 273/356 Performance levels (taken from Fajfar et al. 2004)
4. Seismic performance assessment of rcs building by pushover analysis
DOI: 10.9790/1684-12116773 www.iosrjournals.org 70 | Page
IV. Description Of Studied Structures
Two structures without shear walls are considered to represent low-and medium rise RCS and RC
structures to study. Theses consist of a typical steel beam and RC columns frame building Three story RCS
buildings are designed according to EGP Codes of practice. Design columns under provisions of Egyptian
reinforced concrete structures code and beams are designed according to Egyptian steel construction code.
Material properties are assumed to be 25 Mpa for the concrete compressive strength and 360 Mpa for
the yield strength of reinforcement steel. For steel beams steel 52 is used with yield strength of 360 Mpa
Both building have 3 bays with 4.8 m span in both direction , story height is assumed to be 3.0 m. The
interior frame represents 2-D models of these buildings The columns dimensions in this study are considered
constant for each three story .
The three story building is assumed to be 9.0 m in elevation . Column dimensions are kept constant and
chosen to be 40*40 cm reinforced by 8 16mm as longitudinal reinforcement , Steel beams are considered as
BFI 220 section
For RC building, beams are considered of section 25*60 cm reinforced by 6 16 mm as main
reinforcement and 216 mm as secondary reinforcement at middle columns and with 216 mm as top and
bottom reinforcement at outer columns.
V. Building Performance
The lateral load pattern in Cairo City corresponding to the Egyptian Loading Code (ECP201-2012) is
adopted and applied as auto lateral load pattern in SAP 2000. The load pattern is calculated using
DL+SDL+0.25LL for the EQ load case. The direction of monitoring the behavior of the building is same as the
push direction. In case of columns, program defined auto PM2M3 interacting hinges are provided at both the
ends according to FEMA 356, while in case of beams, M3 auto hinges are provided.
In this study, displacement-controlled pushover analyses were performed on three models for RC, RCS
buildings with three and six floors. The displacement-controlled pushover analysis is basically composed of the
following steps:
1- A three dimensional model that represents the overall structural behavior is created.
2- Gravity loads composed of dead loads and a specified portion of live loads are applied to the structural
model initially.
3- A predefined lateral load pattern representing EQ load pattern is then applied.
4- Lateral loads are increased until some member(s) yield under the combined effects of gravity and lateral
loads.
5- Base shear and roof displacement are recorded at first yielding.
6- The structural model is modified to account for the reduced stiffness of yielded member(s).
7- A new lateral load increment is applied to the modified structural model such that additional member(s)
yield. Thus, member forces at the end of an incremental lateral load analysis are obtained by adding the
forces from the current analysis to the sum of those from the previous increments. In other words, the
results of each incremental lateral load analysis are superimposed.
8- Similarly, the lateral load increment and the roof displacement increment are added to the corresponding
previous total values to obtain the accumulated values of the base shear and the roof displacement.
9- Steps 6, 7 and 8 are repeated until the roof displacement reaches a certain level of deformation or the
structure becomes unstable.
10- The roof displacement is plotted with the base shear to get the global capacity (pushover) curve of the
structure.
Both RC. and RCS, buildings were analyzed using SAP2000 program. Base columns are assumed
hinged at the foundation level. The beams and columns are modeled as nonlinear frame elements with lumped
plasticity , hinges are defined according to the section properties at both ends at the columns and beams
The push over curve for RCS building are shown in Fig. 4 and for RC building in Fig 5. The push
over curves with each associated response spectrum curves for different levels of shaking levels are shown in
Fig 6 for RCS structures and in Fig 7 for RC structure . The hinge patterns are shown in Fig 8 for RC
structure and in Fig 9 for RCS structure.
In RC building plastic hinges formation starts with beam ends then propagates to the beams of the
second story. After that point intermediate base columns of lower stories, then propagates to the intermediate
columns of the second story the plastic hinges performed at outer columns of the lower story and continue with
yielding of interior columns in the upper stories until failure occurs.
In RCS building plastic hinges formation starts with intermediate columns of lower story , then propagates to
interior columns in the upper stories and the intermediate columns of the lower story reaching collapse before
the outer columns , then a failure mechanism occur as soft story of the lower story.
5. Seismic performance assessment of rcs building by pushover analysis
DOI: 10.9790/1684-12116773 www.iosrjournals.org 71 | Page
VI. Summary And Conclusions
A commercial nonlinear finite element computer program (SAP2000) was used to investigate the static
nonlinear behavior (pushover analysis) of (RCS) structures for lateral seismic loads. Two buildings are modeled
to represent low buildings. A Comparison with ordinary RC buildings are presented. the results shows that for
even both structures have almost the base shear capacity, the RCS structures behave linearly till the maximum
shear base capacity is reached , and soft story failure mechanism occurs.
Fig. 4 displacement vs base shear for RCS structure
Fig. 5 displacement vs base shear for RC structure
Fig. 6 pushover and demand spectrum for RCS building
Fig.7 Pushover and demand spectrum for RC building
6. Seismic performance assessment of rcs building by pushover analysis
DOI: 10.9790/1684-12116773 www.iosrjournals.org 72 | Page
Fig8-a Plastic hinges in RC building starts at beams of lower floor
Fig8-b Plastic hinges in RC building propagates to the at beams upper story
Fig8-c Plastic hinges in RC building propagates to the intermediate column
Fig8-d Plastic hinges in RC building propagates to the external columns
Fig. 8 Hinge pattern for RC building
Fig9-a Plastic hinges in RCS building starts at intermediate columns of the lower story
7. Seismic performance assessment of rcs building by pushover analysis
DOI: 10.9790/1684-12116773 www.iosrjournals.org 73 | Page
Fig9-b Plastic hinges in RCS building propgate to the outer columns of the lower story
Fig9-c plastic hinges in RCS building at failure
Fig. 9 hinge pattern for RCS building
Refrences
[1]. Liang Xuemei, Gustavo J. and James K. Wight , “Seismic behavior of RCS beam-column-slab subassemblies designed following
a connection deformation-based capacity design approach” , 13th World Conference on Earthquake Engineering,Vancouver, B.C.,
Canada, August 1-6, 2004.
[2]. Griffis, L.G. (1986). “Some Design Considerations for Composite-Frame Structures,” AISC Engineering Journal, Second Quarter,
pp. 59-64.
[3]. Sheikh, T.M., Yura, J.A., and Jirsa, J.O. (1987). “Moment Connections between SteelBeams and Concrete Columns,” PMFSEL
Report No. 87-4, University of Texas at Austin, Texas.
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