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Thanks for your reply; that is odd though. When I remove all loads except the eleload on one beam, using corotational transformation, I see a load. The load, which is verified as pointing directly downward by analyses with linear transformations, appears to act vertically upward when using corotatio...

it thinks it's done, and stops. I went back to the convergence helper code from the examples manual, and added the decreasing time step, and it continues running. The only difference I see is the extra while loop in the examples manual.

I tried this code, but for some reason, the analysis stops after "Converged at this step, continuing...." What forces the analysis to continue where it left off, that I'm missing?

I have run into a problem with axially distributed loads with corotational transformation before, but had never noticed the current issue before. Can you confirm that distributed loads in all directions are unreliable with corotational transformations? Thanks so much

I build a model 3D model and defined linear transformations as outlined in the online manual, and with local y's defined upwards. The gravity load checked out ok. I then switched to corotational transformations, and the gravity load suddenly didn't check out anymore. It appears that the local y axes...

Thanks, I see it now. I'll play around with hysteretic and steel02 in parallel.

I understand how that could provide a degrading backbone curve, but do you have any suggestion for including cyclic strength degradation?

I've been struggling to find a material that includes the Bauschinger effect that can also model strength degradation. Ideally, I would like to put inelastic rotational springs at the joints between elastic members in a steel frame. To start with, I have modeled a cantilevered column with a rotation...

I'm looking for a material that behaves like Steel02, but with strength degradation. I've looked at the hysteretic and pinching4 materials, but the unloading behavior isn't appropriate. The ReinforcingSteel material with the optional -CMFatigue parameters is probably closest, but if I understand cor...

Thank you; that makes a lot of sense.

Quick question:

Is the $Jd specified in VariableTransient analysis a maximum number of iterations at each time step, or a specified number?

Thanks

e-mail sent

sure, I'll do that tomorrow morning.

Sorry, I misread your idea the first time. I can try this. Thanks

That's sort of what I had in mind. However, I was hoping to run a MATLAB for loop using a series of ground motions, and pass the ground motion name to the opensees tcl file automatically. Unfortunately, I can't figure out how to pass a MATLAB variable into the nested Opensees.