Membrane - Plate - Shell

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.

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[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 .

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P&T Consultants Pte Ltd Civil & Structural Engineer Membrane Shell Overall ,[object Object],[object Object],[object Object],[object Object]

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[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

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Membrane - Plate - Shell

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