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Thanks for your response Vesna. Regarding the 2nd and 3rd questions: 2) So, if I need to use a number of truss elements in series, do I have to connect them with elastic rotational springs to avoid buckling, or there's a better way to do that? I am asking this because I use three truss elements in s...

I have come up with the following questions, I would appreciate if anyone could help me them: 1) Is it not possible to directly attach a truss element (with high stiffness to work as a rigid element) to an element with fiber section (e.g. dispBeamColumnInt or dispBeamColumn, etc). Do we have to use ...

Thanks Vesna. I tried to break my model into simpler elements and so I started off with my wall only (fixed at the base) and then I applied "-fullGenLapack" as the eigen solver which gave me reasonable Periods and Mode shapes. Then I added a rotational spring at the base and it still gave ...

Thanks a lot for your response Vesna. I just tried 2 as the requested number of eigenvalues but I still get the same error message. Do I need to change the default solver? If yes, how would I do that?

Hello, I am pretty new to Opensees and am trying to model a seismic-force resisting system (called PRW) which consists of an unbonded post-tensioned (PT) concrete wall (with rocking behavior at the base) and two Buckling-Restrained Braces (BRB) diagonally attached to the wall (at a point around mid-...