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Membrane - Plate - Shell

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The document discusses the different section assignment options for slabs and walls in ETABS - membrane, shell, and plate. Membrane sections have no out-of-plane stiffness and cannot contribute to resisting bending moments, while plate sections have full out-of-plane stiffness but no in-plane stiffness. Shell sections have both. The effects of each assignment are verified in models of a simple slab. Membrane assignment results in zero slab moments and increased beam moments. Shell and plate assignments produce similar results that account for slab contribution, with lower beam moments. Recommendations are provided on appropriate usage of each section type.

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Presentation by DUY NGUYEN OF P&T Consultants Pte Ltd A BRIEF STUDY OF USING MEMBRANE, SHELL OR PLATE IN ASSIGNING A SLAB/WALL
P&T Consultants Pte Ltd Civil & Structural Engineer FOREWORD: * When using Etabs we may recognize that their are 3 options for a Wall/Slab section assignment. They are Shell, Membrane and Plate. * Each type of section has different features. * Since Slab or Wall is main element so its section assignment will has significant effect into our model output. * In this brief doc, we will go through major meanings of each type, what it will affect to our model and some useful recommendations.
[object Object],P&T Consultants Pte Ltd Civil & Structural Engineer ,[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],P&T Consultants Pte Ltd Civil & Structural Engineer 1. Membrane 2. Shell 3. Plate ,[object Object]
P&T Consultants Pte Ltd Civil & Structural Engineer ,[object Object],[object Object],2.Shell 3. Plate Moment contour of Shell and Plate is similar ,[object Object],[object Object],Slab moment
P&T Consultants Pte Ltd Civil & Structural Engineer ,[object Object],Beam bending moment 2. Shell 3. Plate ,[object Object]
P&T Consultants Pte Ltd Civil & Structural Engineer ,[object Object],Conclusion 3 : The displacement, story drift and period of a Membrane model are also larger than Shell model .
[object Object],P&T Consultants Pte Ltd Civil & Structural Engineer Membrane Shell Slab design ,[object Object],[object Object],[object Object],Beam design ,[object Object],[object Object],[object Object],[object Object],Overall ,[object Object],[object Object],[object Object],[object Object]
P&T Consultants Pte Ltd Civil & Structural Engineer Membrane Shell Overall ,[object Object],[object Object],[object Object],[object Object]
P&T Consultants Pte Ltd Civil & Structural Engineer ,[object Object],[object Object]
[object Object],P&T Consultants Pte Ltd Civil & Structural Engineer “ Different companies will have different styles of using Etabs. It will be depended on the common practice of each company. However, understanding the philosophy of Etabs is the most important so that the modeler can ensure that his model is under controlled.” 1. Membrane is used to transfer the load to the beams without considering the strength contributed by the slab.  It distributes the load in a yield like manner i.e. trapezoidal and triangular loads to the beams.  One thing to note is that membrane will only work if there are 4 surrounding beams. If there is a missing beam, the program divides the triangular or trapezoidal loads to point loads at the supporting columns. 2. Defining slab as membrane sometime generate a lot of errors, especially when the model is not orthogonal. Membrane element may not transfer loading to the beams accurately if it has more than 4 sides.
P&T Consultants Pte Ltd Civil & Structural Engineer 3. Be carefully to check the arrangement of membrane and beams so that loading can be transferred to the correct column and correct quantity similar to load take down by loading area method. 4. For cases where we know that membrane will not work and we wish for our design philosophy to be consistent I.e. ignoring the slab strength, you could always define a shell with a reduced out of plane bending stiffness at locations where the membrane assumption cannot be met.
[object Object],P&T Consultants Pte Ltd Civil & Structural Engineer 1. Etabs manual and help 2. P&T Consultant PTE Practice Note
[object Object],[object Object],P&T Consultants Pte Ltd Civil & Structural Engineer

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Membrane - Plate - Shell

  • 1. Presentation by DUY NGUYEN OF P&T Consultants Pte Ltd A BRIEF STUDY OF USING MEMBRANE, SHELL OR PLATE IN ASSIGNING A SLAB/WALL
  • 2. P&T Consultants Pte Ltd Civil & Structural Engineer FOREWORD: * When using Etabs we may recognize that their are 3 options for a Wall/Slab section assignment. They are Shell, Membrane and Plate. * Each type of section has different features. * Since Slab or Wall is main element so its section assignment will has significant effect into our model output. * In this brief doc, we will go through major meanings of each type, what it will affect to our model and some useful recommendations.
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  • 12. P&T Consultants Pte Ltd Civil & Structural Engineer 3. Be carefully to check the arrangement of membrane and beams so that loading can be transferred to the correct column and correct quantity similar to load take down by loading area method. 4. For cases where we know that membrane will not work and we wish for our design philosophy to be consistent I.e. ignoring the slab strength, you could always define a shell with a reduced out of plane bending stiffness at locations where the membrane assumption cannot be met.
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