Constant Modal Damping

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sugandha
Posts: 8
Joined: Tue Sep 22, 2015 11:07 am
Location: North Carolina State University

Constant Modal Damping

Post by sugandha »

Hi,

I am writing an analysis for a 9DoF system with a constant modal damping ratio of 0.05 so that I can compare my results with SAP linear analysis. How can I do that?

Thanks,
Sugandha Singh
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srihari
Posts: 1
Joined: Wed May 24, 2017 7:31 am
Location: Politecnico Di Milano, Italy

Re: Constant Modal Damping

Post by srihari »

This command may help, but I could not find documentation for it.
modalDamping 0.05;

check this post for more:
http://opensees.berkeley.edu/community/ ... ng#p110188
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selimgunay
Posts: 916
Joined: Mon Sep 09, 2013 8:50 pm
Location: University of California, Berkeley

Re: Constant Modal Damping

Post by selimgunay »

I would use Rayleigh damping both in OpenSees and SAP2000 and run a direct time integration analysis in SAP2000 (not a modal superposition analysis)
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