FB element section level convergence problem

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buddhasarah
Posts: 93
Joined: Thu Feb 12, 2009 8:31 pm
Location: The University of Tokyo

FB element section level convergence problem

Post by buddhasarah »

Hello, I made flexibility based fiber beam-column element program but it was found hard to converge in section level. I set the convergence criteria as the ratio of (absolute sum of risidual section force) to the (absolute sum of the section force applied at the first step of state determination iteration) smaller than 1e-8.
I want to know exactly how OpenSees set the section level convergence criteria, THANK YOU VERY MUCH in advance!
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vesna
Posts: 3033
Joined: Tue May 23, 2006 11:23 am
Location: UC Berkeley

Re: FB element section level convergence problem

Post by vesna »

It checks if the difference between applied and resisting sectional forces is smaller than the tolerance specified at the element level.
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