Rigid floor diaphragm with nonlinear elements

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sumitanand
Posts: 6
Joined: Thu Jan 13, 2011 1:39 pm
Location: Beca Ltd

Rigid floor diaphragm with nonlinear elements

Post by sumitanand » Sat Mar 10, 2012 4:47 pm

Hello,

I have looked at the presentation 'Modeling Diaphragms in 2D Models with Linear and Nonlinear Elements' by Vesna Terzic.

But if you take away the rigid diaphragm constraint for nonlinear RC frames, the number of free dofs increases which gives unrealistic mode shapes? How do you overcome this problem?

Regards

Sumit

vesna
Posts: 3033
Joined: Tue May 23, 2006 11:23 am
Location: UC Berkeley

Re: Rigid floor diaphragm with nonlinear elements

Post by vesna » Sun Mar 11, 2012 6:17 am

if in 3D you can use elastic truss elements with high stiffness (equivalent to floor axial stiffness) to model the diaphragm.

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