Civil Engineering/E-tabs

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Question
hello sir,
I'm a civil engineer student, and kindly i ask you for some explanations,
when i used to design in robot i used to assign a diaphragm behavior instead of the slab,
But why in Etabs although I've assigned a slab i also have to assign a diaphragm ?? please answer me as soon as possible with best thanks and  regards.

Answer
Dear Ali

Rigid diphragm is an ideal model. The slab modelling is a realistic model. You should select between these 2 models. You are not obligated to assign diaphragm when you have a slab. BUT you must get sure about the slab model to use it instead of an ideal diaphragm. If you are not sure and in the case of any doubt , you may need to use diaphragm constraints to model the slab action. Please feel free to ask me further in the case of any doubt.

Regards
BEH

Civil Engineering

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Babak Esmailzadeh Hakimi

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I can answer questions in Structural Engineering, Earthquake Engineering, Project Management and Project Control topics!

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I am experienced in the area of earthquake engineering in electrical power industry, i.e. Lifeline Earthquake Engineering. My focus has been on structural seismic design of power installations. Recently I have got involved in project management in the category of constructional engineering.

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