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You can record the plastic deformation and the time that it is not recording zero or (very small numbers), means that your member is yielded at that time step. So the recorded is on.

Does anyone has any experience with the C++ code for P-Delta or corrotational. I want to make some changes on that to include vertical acceleration effects.

I really appreciate your comments.
Erol

If you are comparing the elastic response from your 3D model with the one from SDOF aproximation (i.e., from elastic spectra of records) then you should not expect to see a good match. It can only happen if your structure behaves in pure first mode only. Otherwise discrepancy is evident.

Are you sure that you have no movement in the other direction other than the load applied in the pushover

How about rigid links or zero length elements for joint problem.
or you may want to use brick elements to model whole arch

Why dont you approximate arch with many but short length nonlinear beam column elements.

Thanks Silvia

As far as I remember, the libraries of this model is in Opensees source code, so we cannot see the actual code (I will check again, some things may change)

I need more details about the hysteretic model in opensees. e.g. What are those energy and damage degreading parameters and how they work.

I really appreciate if you let me know any reference (at least)

omega square

May be you should put the masses to master nodes not to slaves

As far as I remember, someone from georgia tech has written some commands to get damping and hysteretic energy. Actually I also would like to use them. If he/she can share with us, we definitely appreciate it.

The problem is you dont have nonlinear material model, thats why you are getting elastic results.

Did you check your material model, what kind of material model are you using.

Does uniform excitation work only for orthogonal directions or I can also use it for otation instead of translation in a transient analysis. If not, is there any easy way of imposing rotations in a transient analysis to the support. (Rather than rotational spring with aka penalty). Thanks Erol Kalkan