Reinforced cement concrete (RCC) is a composite material made of cement concrete reinforced with steel bars. Some key points:
- François Coignet built the first reinforced concrete structure, a four story house in Paris in 1853.
- RCC is used in the construction of columns, beams, footings, slabs, dams, water tanks, tunnels, bridges, walls and towers due to its high strength and durability.
- The steel reinforcement provides tensile strength, while the concrete primarily resists compressive forces and protects the steel from corrosion. Together they form a very strong, stable structural material.
Reinforced concrete uses steel reinforcement bars embedded in concrete to resist tensile stresses that concrete cannot withstand on its own. The document discusses the composition, properties, and uses of plain cement concrete (PCC) and reinforced cement concrete (RCC). It explains that PCC is a mixture of cement, sand, aggregate and water, while RCC includes steel reinforcement to improve the concrete's tensile strength. The document also covers reinforcement techniques, types of reinforcing steel, mix proportions, characteristics of concrete structures, and ready-mix concrete.
Building materials elements of civil engineeringPriyank Bhimani
The document discusses various construction materials used in civil engineering projects. It describes properties and composition of common materials like stone, bricks, lime, cement, sand and aggregate. It provides details on manufacturing processes, types and qualities required for stones, bricks and lime to be suitable for construction purposes. The mechanical and physical properties of construction materials are also outlined.
The document discusses different types and uses of concrete. It describes three ways concrete can be classified: by binding material (cement or lime concrete), design (plain, reinforced, or pre-stressed concrete), and purpose (vacuum, air entrained, or light weight concrete). For each type, the key ingredients and common uses are provided. The document also covers mix design ratios, water-cement ratios, slump and workability tests, and the compaction factor test for evaluating concrete workability.
The document discusses different types of mortar used in construction. It defines mortar as a mixture of a binding material, fine aggregate, and water. Common binding materials include cement and lime. Mortars are classified by their binding material, such as cement mortar, lime mortar, and mud mortar. Specialty mortars include fire resistant mortar, lightweight mortar, and chemical resistant mortar which are formulated for specific applications. The document outlines the proper mixing and application of different mortars.
Prestressed concrete is concrete that is placed under compression using tensioned steel strands, cables, or bars. This is done through either pre-tensioning or post-tensioning. In pre-tensioning, the steel components are tensioned before the concrete is poured, while in post-tensioning, the steel components are tensioned after the concrete has hardened. Prestressed concrete provides benefits over reinforced concrete like lower construction costs, thinner structural elements, and longer spans between supports.
Reinforced concrete uses steel reinforcement bars embedded in concrete to resist tensile stresses that concrete cannot withstand on its own. The document discusses the composition, properties, and uses of plain cement concrete (PCC) and reinforced cement concrete (RCC). It explains that PCC is a mixture of cement, sand, aggregate and water, while RCC includes steel reinforcement to improve the concrete's tensile strength. The document also covers reinforcement techniques, types of reinforcing steel, mix proportions, characteristics of concrete structures, and ready-mix concrete.
Building materials elements of civil engineeringPriyank Bhimani
The document discusses various construction materials used in civil engineering projects. It describes properties and composition of common materials like stone, bricks, lime, cement, sand and aggregate. It provides details on manufacturing processes, types and qualities required for stones, bricks and lime to be suitable for construction purposes. The mechanical and physical properties of construction materials are also outlined.
The document discusses different types and uses of concrete. It describes three ways concrete can be classified: by binding material (cement or lime concrete), design (plain, reinforced, or pre-stressed concrete), and purpose (vacuum, air entrained, or light weight concrete). For each type, the key ingredients and common uses are provided. The document also covers mix design ratios, water-cement ratios, slump and workability tests, and the compaction factor test for evaluating concrete workability.
The document discusses different types of mortar used in construction. It defines mortar as a mixture of a binding material, fine aggregate, and water. Common binding materials include cement and lime. Mortars are classified by their binding material, such as cement mortar, lime mortar, and mud mortar. Specialty mortars include fire resistant mortar, lightweight mortar, and chemical resistant mortar which are formulated for specific applications. The document outlines the proper mixing and application of different mortars.
Prestressed concrete is concrete that is placed under compression using tensioned steel strands, cables, or bars. This is done through either pre-tensioning or post-tensioning. In pre-tensioning, the steel components are tensioned before the concrete is poured, while in post-tensioning, the steel components are tensioned after the concrete has hardened. Prestressed concrete provides benefits over reinforced concrete like lower construction costs, thinner structural elements, and longer spans between supports.
The document discusses composite construction using precast prestressed concrete beams and cast-in-situ concrete. It describes how the two elements act compositely after the in-situ concrete hardens. Composite beams can be constructed as either propped or unpropped. Propped construction involves supporting the precast beam during casting to relieve it of the wet concrete weight, while unpropped construction allows stresses to develop under self-weight. Design and analysis of composite beams involves calculating stresses and deflections considering composite action. Differential shrinkage between precast and in-situ concrete also induces stresses.
The document discusses reinforced cement concrete (RCC), including its history, materials, specifications, and advantages/disadvantages. RCC uses steel reinforcement embedded in concrete to resist tensile, shear, and sometimes compressive stresses. François Coignet is considered a pioneer of RCC, building the first reinforced concrete structure in 1853. Proper proportions and mixing of cement, aggregates like sand and gravel, and water are needed to produce durable concrete. Precast concrete involves casting pieces off-site then transporting them for assembly.
The document discusses reinforced cement concrete (RCC) structures. It describes two types of building structures - load bearing, where walls transmit loads directly to the ground, and framed structures, where loads are transferred through RCC beams, columns, and slabs. It also discusses design loads on buildings including dead loads from structural weight and live loads. Common RCC structural elements like beams, slabs, shear walls and elevator shafts are described. Raw materials, advantages, specifications, common ratios, one-way and two-way slabs, and examples of RCC structures are covered.
Building Materials & Construction Module-1 Building Materials Abhilash B L
This document provides information on building materials including stone, bricks, aggregates, and concrete blocks. It discusses the requirements of good building stones such as crushing strength, appearance, structure, and resistance to weathering. It also describes the processes of stone dressing, deterioration of stonework, and methods for stone preservation. Details are given on the manufacturing process of clay bricks and various field and laboratory tests conducted on bricks including water absorption, compressive strength, and efflorescence. Classification of bricks based on properties is also mentioned.
Concrete is a composite material made by binding aggregates with a cement paste. It comes in various types depending on the binding material (cement or lime) and purpose (plain, reinforced, pre-stressed). Good concrete has strength, durability, density, water tightness, workability and resistance to wear and tear. Proper mixing, placing, compaction and curing are required to develop these qualities in concrete.
This document defines bricks and their constituents and manufacturing process. It provides the following key details:
- Bricks are clay constructions of uniform size and shape, traditionally 23cm x 11.4cm x 7.6cm or modular 19cm x 9cm x 9cm.
- Good bricks contain 50-60% silica, 20-30% alumina, up to 5% lime, and 5-6% iron oxide.
- Bricks are manufactured through processes of preparation, molding, drying for 7-14 days, and burning at 750-1000°C using clamp or kiln methods.
- Various bonds including English, Flemish, stretcher and header are used in brickwork construction
This document discusses pile foundations. It begins by listing the topics that will be covered, including types of piles, pile spacing, pile caps, load testing, and failures. It then defines a pile foundation as using slender structural members like steel, concrete or timber that are installed in the ground to transfer structural loads to deeper, stronger soil layers. The document goes on to classify piles based on their function, material, and installation method. It describes common pile types such as precast concrete, driven steel, and cast-in-place piles. The document provides details on pile uses, selection factors, and installation procedures.
This document discusses different types of stone masonry and brick masonry. It describes various stone masonry techniques including rubble masonry (uncoursed, coursed random, coursed squared, polygonal, flint) and ashlar masonry (fine, rough, rock-faced, chamfered, block). It also outlines key principles for stone and brick masonry work and compares their properties and construction methods. Supervision tips are provided to ensure proper brickwork.
Properties of fresh and Hardened ConcreteVijay RAWAT
The document discusses various properties of fresh and hardened concrete. It describes workability, consistency, segregation, bleeding, mixing, placing, consolidating, and curing of fresh concrete. It also discusses compressive strength, tensile strength, modulus of elasticity, permeability, and durability of hardened concrete. The key properties of fresh concrete include workability, consistency, segregation, bleeding, setting time, and uniformity. Compressive strength is identified as the most important property of hardened concrete.
Deep foundations are used when the bearing stratum is located at a significant depth below the surface. The most common types of deep foundations are pile foundations, cofferdams, and caisson foundations. Pile foundations support structures using vertical piles that transfer loads either through end bearing or skin friction. Piles can be made of timber, concrete, steel, or a composite. Cofferdams are temporary structures used to exclude water from a construction site to allow work below the water level. Common types include earthfill, rockfill, single-walled, and cellular cofferdams. Caissons are watertight structures that become part of the permanent foundation. Types are open caissons, box caissons
This document presents a summary of different types of bricks. It defines bricks and discusses their sizes, including modular and traditional bricks. It then describes several categories of bricks including building bricks (e.g. clay, sand lime, engineering), paving bricks, fire bricks, and special bricks. Building bricks are used for wall construction, paving bricks are used as pavers, and special bricks are used for uncommon designs. Bricks can also be classified based on their manufacturing quality. The document was created by students at Shree Santkrupa College of Engineering & Technology and discusses bricks to educate about their various types.
Concrete is a versatile building material made by mixing portland cement, water, aggregates like sand and gravel, and sometimes admixtures. It can be easily formed and customized for different uses. Freshly mixed concrete must be workable, meaning it can be easily transported, placed, compacted, and finished without segregating. Workability depends on factors like water content, mix design, and temperature.
Admixtures are materials added to concrete mixes to modify properties. There are two main types - chemical and mineral. Chemical admixtures include plasticizers, superplasticizers, retarders, accelerators, and air-entraining agents. Mineral admixtures include fly ash, slag, and silica fume. Admixtures are used to increase workability, strength, and durability while decreasing water demand and permeability. Common admixtures like plasticizers and superplasticizers work by dispersing cement particles and lubricating the mix to increase flowability.
Concrete is a widely used construction material consisting of cement, water, and aggregates. The strength of concrete is specified using its 28-day cube strength in N/sq.mm. Formwork is used to mold wet concrete into desired shapes and allow it to cure. Formwork design involves choosing traditional or systematic approaches using wood or steel components like props, beams, sheathing to form columns, walls, and beams until the concrete gains sufficient strength. Proper formwork is important for quality concrete finish and structural integrity.
This document provides an overview of concrete, including its composition, properties, production process, and testing. Some key points:
- Concrete is a composite material made of cement, fine and coarse aggregates, and water. It can be classified based on its cementing material, mix proportions, performance specifications, grade, density, and place of casting.
- The production of concrete involves batching, mixing, transporting, placing, compacting, curing, and finishing. Proper batching and mixing are important to ensure uniform strength. Compaction removes entrapped air for maximum strength. Curing maintains moisture for proper hardening.
- Concrete properties depend on water-cement ratio, with maximum theoretical
This document provides information on concrete mix design, including objectives, basic considerations, and the IS (Indian Standards) method for mix design. The objectives of mix design are to achieve the desired workability, strength, durability, and cost. Basic considerations include cost, specifications, workability, strength, durability, and aggregate grading. The IS method is then described in steps, including selecting target strength, water-cement ratio, air content, water and sand contents, cement content, and aggregate contents. An example application of the IS method is also provided.
The document discusses the process of manufacturing concrete. It begins by outlining the key ingredients in ordinary Portland cement - lime, silica, alumina, and iron oxide. These ingredients are heated to high temperatures in a kiln to form complex compounds. There are wet, dry, and semi-dry processes for manufacturing cement, which differ in whether raw materials are mixed dry or as a slurry. In the wet process, materials are ground into a slurry with water before being fed into a rotating kiln where they fuse at 1500°C to form clinker. The clinker is then cooled, ground, and gypsum is added to produce cement. Hydration occurs when cement mixes with water, forming hydrated compounds
Workability refers to the ease with which fresh concrete can be mixed, placed, compacted and finished. It is affected by factors like water content, mix proportions, aggregate size and shape, grading and surface texture. Increasing water content or using admixtures improves workability by acting as a lubricant between particles. Larger, rounded aggregates require less water than smaller, angular ones. Well-graded aggregates with minimal voids also increase workability. Workability can be measured using slump, compacting factor, flow, or Vee Bee tests.
Reinforced concrete is a composite material consisting of concrete and steel reinforcement. François Coignet built the first iron reinforced concrete structure in 1853. Reinforced concrete uses the strengths of both materials - concrete is strong in compression and steel is strong in tension. It is used widely in construction for buildings, bridges, tunnels and other structures due to its high strength and durability.
The document provides information about a course on reinforced concrete structures design and drawing. The course aims to introduce students to limit state design concepts and impart knowledge on designing structural elements like slabs, beams, and columns. The course outline details the various units that will be covered, including introduction to limit state design methodology, design of beams, shear and torsion, slab design, column design, and footing design.
The document discusses composite construction using precast prestressed concrete beams and cast-in-situ concrete. It describes how the two elements act compositely after the in-situ concrete hardens. Composite beams can be constructed as either propped or unpropped. Propped construction involves supporting the precast beam during casting to relieve it of the wet concrete weight, while unpropped construction allows stresses to develop under self-weight. Design and analysis of composite beams involves calculating stresses and deflections considering composite action. Differential shrinkage between precast and in-situ concrete also induces stresses.
The document discusses reinforced cement concrete (RCC), including its history, materials, specifications, and advantages/disadvantages. RCC uses steel reinforcement embedded in concrete to resist tensile, shear, and sometimes compressive stresses. François Coignet is considered a pioneer of RCC, building the first reinforced concrete structure in 1853. Proper proportions and mixing of cement, aggregates like sand and gravel, and water are needed to produce durable concrete. Precast concrete involves casting pieces off-site then transporting them for assembly.
The document discusses reinforced cement concrete (RCC) structures. It describes two types of building structures - load bearing, where walls transmit loads directly to the ground, and framed structures, where loads are transferred through RCC beams, columns, and slabs. It also discusses design loads on buildings including dead loads from structural weight and live loads. Common RCC structural elements like beams, slabs, shear walls and elevator shafts are described. Raw materials, advantages, specifications, common ratios, one-way and two-way slabs, and examples of RCC structures are covered.
Building Materials & Construction Module-1 Building Materials Abhilash B L
This document provides information on building materials including stone, bricks, aggregates, and concrete blocks. It discusses the requirements of good building stones such as crushing strength, appearance, structure, and resistance to weathering. It also describes the processes of stone dressing, deterioration of stonework, and methods for stone preservation. Details are given on the manufacturing process of clay bricks and various field and laboratory tests conducted on bricks including water absorption, compressive strength, and efflorescence. Classification of bricks based on properties is also mentioned.
Concrete is a composite material made by binding aggregates with a cement paste. It comes in various types depending on the binding material (cement or lime) and purpose (plain, reinforced, pre-stressed). Good concrete has strength, durability, density, water tightness, workability and resistance to wear and tear. Proper mixing, placing, compaction and curing are required to develop these qualities in concrete.
This document defines bricks and their constituents and manufacturing process. It provides the following key details:
- Bricks are clay constructions of uniform size and shape, traditionally 23cm x 11.4cm x 7.6cm or modular 19cm x 9cm x 9cm.
- Good bricks contain 50-60% silica, 20-30% alumina, up to 5% lime, and 5-6% iron oxide.
- Bricks are manufactured through processes of preparation, molding, drying for 7-14 days, and burning at 750-1000°C using clamp or kiln methods.
- Various bonds including English, Flemish, stretcher and header are used in brickwork construction
This document discusses pile foundations. It begins by listing the topics that will be covered, including types of piles, pile spacing, pile caps, load testing, and failures. It then defines a pile foundation as using slender structural members like steel, concrete or timber that are installed in the ground to transfer structural loads to deeper, stronger soil layers. The document goes on to classify piles based on their function, material, and installation method. It describes common pile types such as precast concrete, driven steel, and cast-in-place piles. The document provides details on pile uses, selection factors, and installation procedures.
This document discusses different types of stone masonry and brick masonry. It describes various stone masonry techniques including rubble masonry (uncoursed, coursed random, coursed squared, polygonal, flint) and ashlar masonry (fine, rough, rock-faced, chamfered, block). It also outlines key principles for stone and brick masonry work and compares their properties and construction methods. Supervision tips are provided to ensure proper brickwork.
Properties of fresh and Hardened ConcreteVijay RAWAT
The document discusses various properties of fresh and hardened concrete. It describes workability, consistency, segregation, bleeding, mixing, placing, consolidating, and curing of fresh concrete. It also discusses compressive strength, tensile strength, modulus of elasticity, permeability, and durability of hardened concrete. The key properties of fresh concrete include workability, consistency, segregation, bleeding, setting time, and uniformity. Compressive strength is identified as the most important property of hardened concrete.
Deep foundations are used when the bearing stratum is located at a significant depth below the surface. The most common types of deep foundations are pile foundations, cofferdams, and caisson foundations. Pile foundations support structures using vertical piles that transfer loads either through end bearing or skin friction. Piles can be made of timber, concrete, steel, or a composite. Cofferdams are temporary structures used to exclude water from a construction site to allow work below the water level. Common types include earthfill, rockfill, single-walled, and cellular cofferdams. Caissons are watertight structures that become part of the permanent foundation. Types are open caissons, box caissons
This document presents a summary of different types of bricks. It defines bricks and discusses their sizes, including modular and traditional bricks. It then describes several categories of bricks including building bricks (e.g. clay, sand lime, engineering), paving bricks, fire bricks, and special bricks. Building bricks are used for wall construction, paving bricks are used as pavers, and special bricks are used for uncommon designs. Bricks can also be classified based on their manufacturing quality. The document was created by students at Shree Santkrupa College of Engineering & Technology and discusses bricks to educate about their various types.
Concrete is a versatile building material made by mixing portland cement, water, aggregates like sand and gravel, and sometimes admixtures. It can be easily formed and customized for different uses. Freshly mixed concrete must be workable, meaning it can be easily transported, placed, compacted, and finished without segregating. Workability depends on factors like water content, mix design, and temperature.
Admixtures are materials added to concrete mixes to modify properties. There are two main types - chemical and mineral. Chemical admixtures include plasticizers, superplasticizers, retarders, accelerators, and air-entraining agents. Mineral admixtures include fly ash, slag, and silica fume. Admixtures are used to increase workability, strength, and durability while decreasing water demand and permeability. Common admixtures like plasticizers and superplasticizers work by dispersing cement particles and lubricating the mix to increase flowability.
Concrete is a widely used construction material consisting of cement, water, and aggregates. The strength of concrete is specified using its 28-day cube strength in N/sq.mm. Formwork is used to mold wet concrete into desired shapes and allow it to cure. Formwork design involves choosing traditional or systematic approaches using wood or steel components like props, beams, sheathing to form columns, walls, and beams until the concrete gains sufficient strength. Proper formwork is important for quality concrete finish and structural integrity.
This document provides an overview of concrete, including its composition, properties, production process, and testing. Some key points:
- Concrete is a composite material made of cement, fine and coarse aggregates, and water. It can be classified based on its cementing material, mix proportions, performance specifications, grade, density, and place of casting.
- The production of concrete involves batching, mixing, transporting, placing, compacting, curing, and finishing. Proper batching and mixing are important to ensure uniform strength. Compaction removes entrapped air for maximum strength. Curing maintains moisture for proper hardening.
- Concrete properties depend on water-cement ratio, with maximum theoretical
This document provides information on concrete mix design, including objectives, basic considerations, and the IS (Indian Standards) method for mix design. The objectives of mix design are to achieve the desired workability, strength, durability, and cost. Basic considerations include cost, specifications, workability, strength, durability, and aggregate grading. The IS method is then described in steps, including selecting target strength, water-cement ratio, air content, water and sand contents, cement content, and aggregate contents. An example application of the IS method is also provided.
The document discusses the process of manufacturing concrete. It begins by outlining the key ingredients in ordinary Portland cement - lime, silica, alumina, and iron oxide. These ingredients are heated to high temperatures in a kiln to form complex compounds. There are wet, dry, and semi-dry processes for manufacturing cement, which differ in whether raw materials are mixed dry or as a slurry. In the wet process, materials are ground into a slurry with water before being fed into a rotating kiln where they fuse at 1500°C to form clinker. The clinker is then cooled, ground, and gypsum is added to produce cement. Hydration occurs when cement mixes with water, forming hydrated compounds
Workability refers to the ease with which fresh concrete can be mixed, placed, compacted and finished. It is affected by factors like water content, mix proportions, aggregate size and shape, grading and surface texture. Increasing water content or using admixtures improves workability by acting as a lubricant between particles. Larger, rounded aggregates require less water than smaller, angular ones. Well-graded aggregates with minimal voids also increase workability. Workability can be measured using slump, compacting factor, flow, or Vee Bee tests.
Reinforced concrete is a composite material consisting of concrete and steel reinforcement. François Coignet built the first iron reinforced concrete structure in 1853. Reinforced concrete uses the strengths of both materials - concrete is strong in compression and steel is strong in tension. It is used widely in construction for buildings, bridges, tunnels and other structures due to its high strength and durability.
The document provides information about a course on reinforced concrete structures design and drawing. The course aims to introduce students to limit state design concepts and impart knowledge on designing structural elements like slabs, beams, and columns. The course outline details the various units that will be covered, including introduction to limit state design methodology, design of beams, shear and torsion, slab design, column design, and footing design.
This document provides an outline for lectures on prestressed concrete, including basic concepts, materials, flexural analysis, design considerations, shear/torsion, loss of prestress over time, composite beams, and deflections. Key points covered include how prestressing controls cracking by applying compressive stresses to concrete before service loads; common prestressing methods of pre-tensioning and post-tensioning; estimating stresses in uncracked concrete beams using elastic theory; and accounting for various load stages in analysis and design.
This document provides a brief history of prestressed concrete, beginning in 1824 with the development of Portland cement. It then outlines several important developments in prestressed concrete technology from the late 19th century through the mid-20th century by innovators from various countries. These include early uses of steel in concrete, prestressing methods like pre-tensioning and post-tensioning, and development of high-strength steel and anchoring systems. It also mentions increased use of prestressed concrete during World War 2 and establishment of professional organizations to support the field.
1 CE133P Introduction to Reinforced Concrete Design (Robles) 2.pdfjoerennelapore
This document provides an introduction to reinforced concrete design. It defines reinforced concrete as a composite material of concrete and steel reinforcement. Concrete provides compressive strength while steel provides the tensile strength lacking in concrete. The document discusses the advantages and disadvantages of using reinforced concrete, properties of concrete and steel, stress-strain relationships, design codes, and concepts like shrinkage and creep.
Reinforcement concrete and properties of matrial VIKAS4210607
The document discusses the properties and characteristics of reinforced concrete and its constituent materials - concrete and steel reinforcement. It provides information on:
- Concrete is composed of cement, aggregate and water that hardens over time to form a durable stone-like material. Reinforced concrete includes steel reinforcement to increase its tensile strength.
- The properties of concrete and steel depend on their composition and standards. Concrete properties include compressive strength and shrinkage properties. Steel properties include yield strength.
- Permissible stresses values for concrete and steel under different loads and grades are defined in codes based on material testing. Reinforced concrete exploits the composite action of concrete and steel to form an efficient structural material.
This document provides an introduction to reinforced concrete, including its key components and purposes. Reinforced concrete is a composite material made of concrete, which resists compression well but has low tensile strength, and steel reinforcing bars, which resist tension well. Together they create an economical and strong structural material. The document outlines structural elements, design considerations for safety, reliability, and economy, and limit state design principles which ensure structures do not fail under expected loads. It also discusses factors that affect concrete durability and different failure modes in reinforced concrete depending on steel reinforcement ratios.
This document provides an overview of pre-stressed and precast concrete. It discusses basic concepts like pre-stressing, uses of pre-stressed concrete, materials used including high-strength concrete and steel, and methods of prestressing like pre-tensioning and post-tensioning. It also covers topics like tendon profiles, advantages and disadvantages of pre-stressed concrete, losses in prestressing, types of prestressing steel, properties of prestressing steel, and use of non-prestressed reinforcement. The document is submitted by 5 students and contains 15 chapters with information on concepts, introduction, early introduction, uses, the basic idea, methods, profiles, advantages, disadvantages, losses, materials, types of
This document discusses prestressed concrete, including:
- The basic concepts of prestressing including using metal bands, pre-tensioned spokes, and introducing stresses to counteract external loads.
- Design concepts like losses in prestressing structures from elastic shortening, creep, shrinkage, relaxation, friction, and anchorage slip.
- Provisions for prestressing in the Indian Road Congress Bridge Code and Indian Standard Code.
- Construction aspects like casting of girders, post-tensioning work, and load testing of structures.
This document provides an introduction to reinforced concrete, including:
- Concrete is a mixture of cement, sand and aggregate that gains strength through chemical bonding when water is added. Reinforcing concrete with steel overcomes its weakness in tension.
- The history of reinforced concrete dates back to 1855 when it was first used in a boat. Later developments included its use in buildings in the 1860s and the first theory published in 1886.
- Structures must be designed to safely carry all loads that will act on it over its lifetime, including dead loads from structural elements, live loads from occupants/contents, and loads from wind, earthquakes, etc.
- The properties and classification of concrete are discussed, noting
This document provides an introduction to reinforced concrete. It defines concrete, reinforced concrete, and prestressed concrete. It discusses the mechanical properties of concrete and steel. It also covers the different types of loads that act on structures, including dead loads, live loads, wind loads, and earthquake loads. The document emphasizes that structures must be designed to carry all anticipated loads throughout their design life while maintaining adequate strength, serviceability, and safety with consideration for uncertainties in analysis, design, construction, and loading.
This document provides an introduction to reinforced concrete, including:
- Concrete is a mixture of cement, sand and aggregate that gains strength through chemical bonding when water is added. Reinforcing concrete with steel overcomes its weakness in tension.
- The history of reinforced concrete dates back to 1855 when it was first used in a boat. Later developments included its use in buildings in the 1860s and the first theory published in 1886.
- Structures must be designed to safely carry all anticipated loads, including dead loads from structural elements, live loads from occupants/contents, and environmental loads like wind and earthquakes.
- Reinforced concrete structures form a monolithic three-dimensional system. For analysis, floors and
Reinforced Concrete (RC) design is the process of planning and specifying the construction of structures or components using reinforced concrete. Reinforced concrete is a composite material made up of concrete (a mixture of cement, water, and aggregates) and reinforcing steel bars or mesh, which enhances its strength and durability. RCC is commonly used in the construction of buildings, bridges, dams, highways, and various other infrastructure projects due to its versatility and strength.
It's important to note that RCC design can be quite complex and should be carried out by experienced structural engineers who have a deep understanding of the principles, codes, and standards related to reinforced concrete design. Additionally, local building authorities and regulations must be followed to ensure the safety and compliance of the structure.
Here are the key steps involved in RCC design:
Structural Analysis: The first step in RCC design is to analyze the structural requirements of the project. This involves determining the loads that the structure will need to support, such as dead loads (permanent loads like the weight of the structure itself) and live loads (variable loads like people, furniture, and equipment). Structural analysis helps in understanding the internal forces and moments acting on the structure.
Material Properties: Understanding the properties of the materials used in RCC is crucial. This includes knowledge of concrete mix design (proportions of cement, water, aggregates, and admixtures), as well as the properties of reinforcing steel (yield strength, tensile strength, etc.).
Design Codes and Standards: RCC design must adhere to local building codes and standards, which dictate safety and design criteria. These standards may vary by region or country, so it's important to consult the relevant codes for your project.
Structural Design: The structural design phase involves selecting appropriate dimensions for the structural elements (beams, columns, slabs, etc.) to withstand the anticipated loads. This involves calculations and considerations for factors like safety, serviceability, and economy.
Reinforcement Design: Once the structural elements are sized, the design of the reinforcement (rebar or mesh) is carried out. This includes determining the quantity, size, spacing, and placement of reinforcement to ensure the concrete can handle the expected tensile forces.
Detailing: Detailed drawings and specifications are created, specifying all the design details, including reinforcement layouts, concrete cover, joint locations, and more. Proper detailing is essential for construction contractors to follow the design accurately.
After construction, proper maintenance is essential to ensure the longevity and safety of the structure. This includes routine inspections, repairs, and protection against environmental factors like corrosion.
Quality control measures, such as testing concrete and inspecting reinforcement
Prestressed concrete is a combination of steel and concrete that uses compressive stresses applied during construction to oppose tensile stresses that occur in use. There are three main types: pre-tensioned concrete uses steel tendons tensioned before concrete is placed; bonded post-tensioned concrete uses unstressed steel placed then tensioned after curing; and unbonded post-tensioned concrete provides freedom of movement between steel and concrete. Pre-tensioned concrete requires molds that can resist internal forces and calculations to account for losses over time. Prestressed concrete provides benefits like reduced cracking and corrosion, higher strength, and more economical construction for bridges compared to steel.
The document summarizes various reinforced concrete structural elements used in building construction, including:
1. Columns, beams, slabs, staircases, lintels, chhajjas (eaves), canopies, and coffer slabs are discussed. Columns transfer loads from above to the foundation. Beams provide horizontal load resistance and resist bending. Slabs are floor and ceiling elements supported by columns and beams.
2. Staircases can be made of reinforced concrete and come in different arrangements like straight flights or landings. Lintels support walls above openings. Chhajjas project from walls to provide shade. Canopies provide shelter from weather. Coffer slabs have sunken, decorated
This document discusses steel-concrete composite construction. It describes shear connectors, which provide composite action between steel beams and concrete slabs. There are three main types of shear connectors: rigid connectors made of steel bars or angles that resist shear through bearing pressure; flexible stud connectors that bend and fail through yielding; and bond-type connectors that rely on bond and anchoring. The document discusses the design of shear connectors according to Indian codes IRC 22-1986 and IS 11384-1985, providing methods to calculate the design strength of shear connectors.
Prepared by madam rafia firdous. She is a lecturer and instructor in subject of Plain and Reinforcement concrete at University of South Asia LAHORE,PAKISTAN.
This presentation is about RCC. one can find most of the information about RCC with architecture in mind. Structure Design - 2 Semester 2 B. Arch Notes
The document discusses the design of reinforced concrete beams. It defines key terms related to beam design such as effective depth, clear cover, and balanced/unbalanced sections. It also describes the process for designing beams, which involves calculating design constants, assuming beam dimensions, determining loads and bending moments, calculating steel reinforcement requirements, checking for shear and deflection, and developing a design summary. The goal of the design process is to select a beam section that will safely and satisfactorily carry loads over the structure's lifetime.
Folded plate structures are assemblies of flat plates connected along their edges that form a rigid structural system capable of carrying loads without internal beams. Engineer Eudene Freyssinet performed the first roof with a folded structure in 1923. Folded structures mimic systems in nature like leaves and insect wings. Their structural behavior depends on factors like the folding pattern and connection of planes. Folded structures have applications as roofs, walls, floors, and foundations and provide advantages like lightness and long spans but also challenges like complex formwork. Examples include the US Air Force Academy Chapel and structures in Bangladesh.
Yield line theory is an analysis approach for determining the ultimate load capacity of reinforced concrete slabs. It was pioneered in the 1940s and is closely related to plastic collapse analysis of steel frames. It assumes ductile behavior where yield lines form that allow further rotation without additional moment. Yield line analysis is allowed by some codes if the ratio of crack spacing to depth is low. Advantages are it is simpler than elastic analysis and gives ultimate capacity rather than just yield load, while disadvantages are it requires understanding likely failure mechanisms and may allow dangerous designs without further checking.
Space frames are rigid, lightweight structures constructed from interlocking struts arranged in geometric patterns. They can span large areas with few interior supports due to their inherent rigidity from triangular formations that transmit loads as tension and compression. Folded plate structures are assemblies of rigidly connected flat plates that can carry loads without interior beams. They were first used in 1923 for an aircraft hangar roof in Paris and take inspiration from structures in nature like tree leaves. Cable structures have cables as their primary load-bearing elements and are often used in bridges and roofs to transmit loads between supports.
Fibre reinforced concrete is a composite material consisting of cement, mortar or concrete and discrete, uniformly dispersed fibres that can improve the flexural, impact and fatigue strength of concrete. Common fibres used include steel, polypropylene, nylon, glass and carbon fibres. The fibre geometry, content, orientation and distribution affect the composite material properties. Self-compacting concrete is a highly flowable mixture that does not require vibration for placing and consolidation due to its high deformability and low yield value. It provides benefits over conventional concrete such as faster construction, better surface finish and reduced noise levels. The mix design of SCC focuses on optimizing the powder content, chemical admixtures and viscosity.
Circular slabs are used for roofs that are circular in plan, floors of circular tanks or towers, and roofs over pump houses or traffic control posts. Bending occurs in two perpendicular directions for circular slabs. Reinforcement is provided as a mesh with equal area in both directions, sized for the larger of the radial or circumferential moments. Near edges, radial and circumferential reinforcement may be needed if edge stresses are significant or if the edge is fixed. Circular slabs are commonly used in water tanks, where they deflect into a saucer shape under uniform loads and develop tensile and compressive stresses radially and circumferentially.
The document discusses the design of beams subjected to combined bending, shear, and torsional moments according to Indian code IS 456. It defines the two types of torsional moments, provides examples of structural elements that experience torsion, and explains the code's approach which involves determining equivalent shear and bending moments. The design procedure involves selecting a critical section and determining longitudinal and transverse reinforcement based on the equivalent internal forces. Numerical examples are also provided to illustrate the design process.
- Deep beams are defined as beams with a shear span to depth ratio of less than 2. They behave differently than ordinary beams due to two-dimensional loading and non-linear stress distributions.
- Deep beams transfer significant load through compression forces between the load and supports. Shear deformations are more prominent.
- Design of deep beams requires considering two-dimensional effects, non-linear stress distributions, and large shear deformations. Procedures include checking minimum thickness, designing for flexure and shear, and detailing reinforcement.
The document discusses different types of slabs used in structures. Slabs can be one-way or two-way, with one-way slabs primarily deflecting in one direction and two-way slabs supported by columns allowing deflection in two directions. Common slab types include simply supported, cantilever, fixed, overhanging, and continuous. Slabs require formwork, reinforcement including straight bars and cranked bars near supports, and concrete casting and curing.
Columns are structural elements that transmit loads in compression from beams and slabs above to other elements below. Columns can experience both axial compression and bending loads. Biaxial bending occurs when a column experiences simultaneous bending about both principal axes, such as in corner columns of buildings. The biaxial bending method permits analysis of rectangular columns under these conditions. The document provides details on analyzing a sample reinforced concrete column for adequacy using the reciprocal load method to check that factored loads do not exceed design capacity. Diagrams are presented showing interaction surfaces and stress distributions for concentrically and eccentrically loaded columns.
The document discusses buckling of columns under axial compression. It describes:
1) Different buckling theories including elastic buckling, inelastic buckling using tangent modulus theory and reduced modulus theory. Shanley's theory accounts for the effect of transverse displacement.
2) Factors affecting buckling strength including end conditions, initial crookedness, and residual stresses. Effective length accounts for end restraint.
3) Local buckling of thin plate elements can reduce the column's strength before its calculated buckling strength is reached. Flange and web buckling must be prevented.
This document discusses the design of columns subjected to axial compression. It covers various buckling failure modes including flexural, local, and torsional buckling. It provides definitions of critical load and slenderness ratio, which are important parameters for column design. Design approaches are discussed including selecting a trial section based on slenderness ratio, calculating the design compressive stress, and checking if the design strength exceeds the factored load. Details are also provided on built-up column design using lacing, battens, and back-to-back members.
Calulation of deflection and crack width according to is 456 2000Vikas Mehta
This document discusses the calculation of crack width in reinforced concrete flexural members. It provides information on:
1) Crack width is calculated to satisfy serviceability limits and is only relevant for Type 3 pre-stressed concrete members that crack under service loads.
2) Crack width depends on factors like amount of pre-stress, tensile stress in bars, concrete cover thickness, bar diameter and spacing, member depth and location of neutral axis, bond strength, and concrete tensile strength.
3) The method of calculation involves determining the shortest distance from the surface to a bar and using equations involving member depth, neutral axis depth, average strain at the surface level. Permissible crack widths are specified depending on exposure
- The document discusses the design of a combined footing to support two columns carrying loads of 700 kN and 1000 kN respectively.
- A trapezoidal combined footing of size 7.2m x 2m is designed to support the loads and transmit them uniformly to the soil.
- Longitudinal and transverse reinforcement is designed for the footing and a central beam is included to join the two columns. Detailed design calculations and drawings of the footing and beam are presented.
This document discusses the design and analysis of flat slab structures. It begins with an introduction to flat slabs and their uses of column heads and drop panels. The benefits of flat slabs are then outlined, including flexibility in layout, reduced building height, and ease of M&E installation. Design considerations are presented such as structural stiffness, deflection limits, and shear reinforcement. The document analyzes flat slab design methodology including finite element analysis, simplified methods, and equivalent frame analysis. Moment distribution, punching shear, deflection, and detailing of reinforcement mesh are also summarized.
Foundations can be broadly classified as shallow or deep. Shallow foundations include spread footings, combined footings, strap footings, and mat/raft foundations. Deep foundations transfer load to deeper soils and include pile foundations, pier foundations, and caissons/well foundations. Under-reamed pile foundations are recommended for expansive soils like black cotton soil as they anchor the structure below the moisture fluctuation zone. The piles are bored, under-reamed at the base, reinforced, and poured with concrete to provide a stable foundation.
Footings are the lower part of a building's foundation constructed below ground level. They transfer the building's live and dead loads to the soil over a large area to prevent movement of the soil or building. Footings must resist settlement and lateral loads. Their size depends on the allowable bearing capacity of the soil, total load on the footing, and column dimensions. Shear failure can occur at the footing-column connection or within the footing itself. Combined or strap footings are used to distribute loads across property lines or between closely spaced columns.
Deep beams are structural elements where a significant portion of the load is carried to the supports by compression forces combining the load and reaction. As a result, the strain distribution is nonlinear and shear deformations are significant compared to pure flexure. Examples include floor slabs under horizontal loads, short span beams carrying heavy loads, and transfer girders. The behavior of deep beams is two-dimensional rather than one-dimensional, and plane sections may not remain plane. Analysis requires a two-dimensional stress approach.
Definition Where this system can be used
Features of the Grid Slab
Decorative grid slabs in historical structures
Types of Grid Slab
Comparison: Long Span Structures
Construction
Technique
Formwork Required
Reinforcements Details
Modification in Grid Slab for Utility
Services Provided in Grid Slab
Benefits
Iconic Landmarks using Grid Slabs
The document defines different types of structural footings used to support columns, walls, and transmit loads to the soil. It discusses isolated, combined, cantilever, continuous, raft, and pile cap footings. It also covers footing design considerations like allowable bearing capacity, shear strength, bending moment, and reinforcement requirements. The document provides formulas and steps for calculating footing size, reinforcement, and checking design requirements.
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2. Brief History
• François Coignet was a French industrialist of the
nineteenth century, a pioneer in the development of structural,
prefabricated and reinforced concrete.
• In 1853 Coignet built the first iron reinforced concrete structure, a four story
house inParis.
• Ernest L. Ransome, was an innovator of the reinforced concrete techniques in
the end of the 19thcentury
3. Uses of RCC
• It is used in the construction of Columns, Beams, Footings, Slabs etc.
• It is used in storage structures like Dams, Water Tanks, Tunnels etc.
• It is used to build heavy structures like Bridges, Walls, Towers, Under water
structures.
• It is used in tall structures and skyscrapers.
4. Why it is essential?
• High relative strength
• High toleration of tensile strain
• Good bond to the concrete, irrespective of pH, moisture, and
similar factors
• Thermal compatibility, not causing unacceptable stresses in response
to changingtemperatures.
• Durability in the concrete environment, irrespective of corrosion or sustained
stress forexample.
5. Merits of Reinforced Concrete
• Good Binding Between Steel and Concrete
there is a very good development of bond between steel and concrete.
• Stable Structure
Concrete is strong in compression but week in tension and steel as strong in
tension so their combination give a strong stable structure.
• Less Chances of Buckling
Concrete members are not slim like steel members so chances of
buckling are much less.
• Aesthetics
concrete structures are aesthetically good and cladding is not required
• Lesser Chances of Rusting
steel reinforcement is enclosed in concrete so chances of rusting are
reduced.
6. Short Reinforced Concrete Compression Members
Short - slenderness does not need to be considered–column will
not buckle
Only axial load
Cross-sectional
Areas:
As =Area ofsteel
Ac =Area of
concrete Ag =
Totalarea
Fs =stress in
steel
Fc =stress in
concrete
From Equilibrium:
P =Acfc +Asfs
L
P
If bond is maintained εs = εc
7. Reinforced Concrete
Load
Roof Surface
Roof Slab
Beams
Column
Foundation
Sub Soil
Mechanism of Load
Transfer
Function of structure is
to transfer all the loads
safely to ground.
A particular structural
member transfers load
to other structural
member.
8. Design Loads
Dead Load
“The loads which do not change their magnitude and
position w.r.t. time within the life of structure”
Dead load mainly consist of superimposed loads and self
load of structure.
Self Load
It is the load of structural member due to its own weight.
Superimposed Load
It is the load supported by a structural member. For
instance self weight of column is self load and load of beam and
slab over it is superimposed load.
9. Design Loads (contd…)
Live Load
“Live loads consist chiefly of occupancy loads in buildings
and traffic loads on bridges”
They may be either fully or partially in place or not present at all, and
may also change in location.
Their magnitude and distribution at any given time are uncertain, and even
their maximum intensities throughout the life time of the structure are not
known with precision.
The minimum live loads for which the floor and roof of a building should be
designed are usually specified in the building codes that governs at the site
construction.
10. Objectives of Designer
There are two main objectives
1. Safety
2. Economy
Safety
The structure should be safe enough to carry all the applied
throughout the life.
Economy
Structures should be economical. Lighter structures are more
economical.
Economy α1/self weight (More valid for Steel Structures)
In concrete Structures overall cost of construction decides the
economy, not just the self weight.
11. Load Combinations
To combine various loads in such a way to get a critical situation.
Load Factor = Factor by which a load is to be increased x probability of
occurrence
1. 1.2D + 1.6L
2. 1.4D
3. 1.2D + 1.6L + 0.5Lr
4. 1.2D + 1.6Lr + (1.0L or 0.8W)
Where
D = Dead load
L = Live load on intermediate floors
Lr = Live load on roof W
= Wind Load
12. Shrinkage
“Shrinkage is reduction in volume of concrete due to loss of water”
Coefficient of shrinkage varies with time. Coefficient of shortening is:
0.00025 at 28 days
0.00035 at 3 months
0.0005 at 12 months
Shrinkage = Shrinkage coefficient x Length
Excessive shrinkage can be avoided by proper curing during first 28
days because half of the total shrinkage takes place during this period
13. Creep
“creep is the slow deformation
of material over considerable
lengths of time at constant
stress or load”
Creep deformations for a given
concrete are practically
proportional to the magnitude of the
applied stress; at any given stress,
high strength concrete show less
creep than lower strength concrete.
Compressive
strength
Specific
Creep
(MPa) 10-6 perMPa
20 145
30 116
40 80
55 58
14. Plain & Reinforced Concrete
Creep (contd…)
How to calculate shortenings due to creep? Consider a column of 3m
which is under sustained load for several years.
Compressive strength, fc’ = 30 MPa
Sustained stress due to load = 10 MPa
Specific creep for 28 MPa fc’ = 116 x 10-6 per MPa Creep
Strain = 10 x 116 x 10-6 = 116 x 10-5
Shortening due to creep = 3000 x 116 x 10-5
= 3.48 mm
15. Strength measurement
Specified Compressive Strength Concrete, fc’
“28 days cylinder strength of concrete”
The cylinder has 150mm dia and 300mm length.
According to ASTM standards at least two cylinders should be tested
and their average is to be taken.
ACI 5.1.1: for concrete designed and constructed in accordance with ACI
code, fc’ shall not be less than 17 Mpa (2500 psi)
19. When the earthquake forces exceed the design parameters, the alternating forces
of the earthquake first break the concrete on one side of the column and
subsequently on the other side.
21. Building A :- has thick and stiff floors and
slender supportingcolumns.
During a earthquake, the whole building will pancake. the bottom columns
receive the largest forces and bend; wallscrack
Building B :- has a ductile floordesign.
During Earthquake, Floors will be waving and cracking, but the building
would notcollapse.
24. How to avoid corrosion?
⚫ Careful detailing to protect from water
⚫ Use stainless steel
⚫ Protect steel with galvanizing (zinc coating) or other
protective coating
25. Corrosion of Steel
Every 90 seconds, across the world, one ton of steel turns
to rust; of every two tons of steel made, one is to replace
rust.
26. • Most concrete used for construction is a combination of
concrete and reinforcement that is called reinforced
concrete.
• Steel is the most common material used as reinforcement, but
other materials such as fiber-reinforced polymer (FRP) are also
used
Reinforcement in aconcrete column
27. REINFORCEMENT USED IN RCC BUILDING
Fiber reinforcement:
Fiber-reinforced concrete (FRC) is concrete with the addition of discrete
reinforcing fibers made of steel, glass, synthetic(nylon, polyester, and
polypropylene), and natural fiber materials.
Synthetic fibers can be delivered to the mixing system in preweighed, degradable
bags that break down during the mixing cycle. Steel fibers are introduced to the
rotating mixer via conveyor belt, either at the same time as the coarse aggregate or
on their own after all the conventional ingredients have been added.
1. The major applications of FRC are slab-on-grade construction, precast concrete, and
shotcrete.
2. Some examples of slab-on-grade construction are airport runways, residential,
commercial, and industrial floor slabs, and hydraulic structures
3. Fiber- reinforced shotcrete is used for rock slope stabilization, tunnel liners,
hydraulic structures, and maintenance of existing concrete.
4. FRC is also used in repair applications, such as repair of bridge decks, piers, and
parapets.
28. Steel reinforcement:-Steel reinforcement is available in the form of plain steel
bars, deformed steel bars, cold-drawn wire, welded wire fabric, and deformed
welded wire fabric.
Deformed steel bars:—Deformed bars are round steelbars with lugs, or
deformations, rolled into the surface of the bar during manufacturing
Threaded steel bars:—Threaded steel bars are made by several
manufacturers in different grades They are used as an alternative to lapping
standard deformed bars when long bar lengths arerequired
Welded wire fabric:—Welded wire fabric reinforcement also known as welded
wire reinforcement is a square or rectangular mesh ofwires.
Typicaldeformed reinforcing bar
Welded wirereinforcement sheets
29. TYPES OF CONCRETE
1.Prestressed concrete:
Prestressed concrete is structural concrete in which internal stresses have
been introduced to reduce potential tensile stresses in the concrete
resulting from loads.
Applications
a. Toresist internal pressures in circular structures like tank,pipe
b. To limit cracking in bridge decks and slabs-on-grade.
c. To improve capacity of columns and piles.
d. To reduce long-term deflections.
2.Plain concrete:
Plain concrete is structural concrete withoutreinforcement
It is sometimes used in slabs-on grade ,pavement, basementwalls,
small foundations, and curb-and-gutter.
30. 3.Pretensioned concrete:
Pretensioning is usually performed in a factory (or precasting yard). The
tendons are held in place and tensioned against the ends of the casting
bed before the concrete is placed.
Advantages of pretensioned concrete are that it
tendons are bonded to the concrete over theirentire length.
4.Post-tensioned concrete:
Post-tensioning is usually performed at the job site. Post- tensioning tendons
are usually internal but can be external.
Some of the advantages of post-tensioning are that it does not require the
large temporary anchorages required for pretensioning,
It allows for larger members than are possible in aprecasting plant.
31. Plain & Reinforced Concrete
Reinforced Cement Concrete (RCC) contd..
Mix Proportion
Cement : Sand : Crush
1 : 1.5 : 3
1 : 2 : 4
Water Cement Ratio (W/C)
1 : 4 : 8
W/C = 0.5 – 0.6
For a mix proportion of 1:2:4 and W/C = 0.5, if cement is 50 kg
Batching By Weight
Sand
Crush
Water
= 2 x 50 = 100 Kg
= 4 x 50 = 200 Kg
= 50 x 0.5 = 25 Kg
33. Slabs
It is better to provide a max spacing of 200mm(8”) for main bars and
250mm(10”)in order to control the crack width and spacing.
A min. of 0.24% shall be used for the roof slabs since it is subjected to higher
temperature. Variations than the floor slabs. This is required to take care of
temp. differences.
It is advisable to not to use 6mm bars as main bars as this size available in
the local market is of inferior not only with respect to size but also the
quality since like TATAand SAILare not producing this size of bar.
34. Beams
A min. of 0.2% is to be provided for the compression bars in order to take care of
thedeflection.
The stirrups shall be minimum size of 8mm in the case of lateral load resistance .
The hooks shall be bent to 135degree.
36. Foundation
Minimum size of foundation for a single storey of G+1building, where
soil safe bearing capacity is 30 tonnes per square meter, and the oncoming
load on the column does not exceed 30tonnes.
Reinforcing bar details
37. Arrangement of reinforcement in various
structural members :
R.C.C. is used as a structural element, thecommon structural elements in
a buildingwhere
R.C.C. is used are:
(a) Footings (b) Columns
(c) Beams and lintels (d) roofs and slabs.
38. 1) Footings :
• In rectangular footing the reinforcement parallel to the long direction shall be
distributed uniformly across the width of the footing.
• In short direction, since the support provided to the Footing by the column is
concentrated near the middle, the moment per unit length is largest i.e., the
curvature of the footing is sharpest immediately under the column and
decreases in the long direction with the increasing distance from the column.
• For this reason larger steel area is needed in the central portion and is
determined in accordance with the equation given below.
39. 2) Columns :
The main reinforcement in columns in longitudinal , parallel to the direction
to the direction of the load and consists of bars arranged in square,
rectangular or spherical shape.
Main steel is provided to resist the compression load along with the
concrete.
The bar shall not be less than 12mmin diameter
Nominal max. Size of coarse aggregte is 5mm.
The no of bars in columns are varies from 10,12,14,16 with varyingdiameter.
40. 3) Beams :
Generally a beam consists of following types of
reinforcements :
Longitudinal reinforcement .
Shear reinforcements.
Side face reinforcement in the web of the beam isprovided
when the depth of the web in a beam exceeds 750mm.
Arrangements of bars in a beam should confirm to the requirements of
clause given in 8.1and 8.2of SP34.Bars of size 6,8,10,12,16,20,25,32,50 mm are
available in market.
41. Thickness of the slab is decided based on span to depth ratio . Min
reinforcement is 0.12% for HYSD bars and 0.15% for mild steel bars. The
diameter of bar generally used in slabs are: 6 mm, 8 mm, 10mm, 12mm and 16
mm.
The maximum diameter of bar used in slab should not exceed 1/8 of the total
thickness of slab. Maximum spacing of main bar is restricted to 3 times
effective depth . For distribution bars the maximum spacing is specified as 5
times the effective depth .
4) Slabs :
42. Minimum clear cover to reinforcements in slab depends on the durability
criteria . Generally 15 mm to 20 mm cover is provided for the main
reinforcements.
Torsion reinforcement shall be provided at any corner where the slab is
simply supported on both edges meeting at that corner.
It shall consist of top and bottom reinforcement, each with layer of bars
placed parallel to the sides of the slab and extending from the edges a
minimum distance of one fifth of the shorterspan.
43. Thank you
Mr. VIKAS MEHTA
School of Mechanical and civil engineering
Shoolini University
Village Bajhol, Solan (H.P)
vikasmehta@shooliniuniversity.com
+91 9459268898