Concrete02 convergence

[xavio]

Hello,

I am modelling a bridge. The columns are forceBeamColumn elements with fiber section. When I use material Concrete02, the analysis fail to converge (failed to get compatible element forces and deformations for element error), but when i use Concrete01, it works. I don't understand how this is possible. I'm pretty sure my material definition is good. Does someone have any ideas? Thank you!

[vesna]

So far, Concrete02 was extensively used by OpenSees users and I never had anyone with the same problem. Check the definition of your material again.

[xavio]

I found the problem. It was because of a wrong definition of the geomtransf command (bad orientation of self weight). Thank you for your attention.

[parsaparvanehro]

Dear xavio
After 11 years . Could you please explain it. I faced with similar problem.

[mhscott]

Probably had to do with member loads being defined with respect to local element axes whereas xavio may have assumed the member loads were defined with respect to global axes.