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As I said, I used uniformexcitation pattern. And as your recommandation, I check two extreme cases. When I applied very small mass, accleration recorded by opensees was very small. And when very large mass, it is almost same as ground acceleration except sign. I think that If it is total acceleratio...

What is the definition of absolute acceleration? Is it mean equally total acceleration which mean sum of relative accleration and ground accleration? I applied earthquake load by using uniformexcitation pattern. After comparing with theoritical solution, opensees recorded relative acceleration, velo...

I can't find option to record total acceleration. In other way to get total acceleration, I sumed relative and ground acceleration. But it is much different to theoretical value.

Could you tell me how to get total acceleration..

I modeled SAC building with nonlinear beamcolumn element. When I used 5 integration points for nonlinear beamcolumne element, opensees gave good result, which was consitent with established study. But after reducing integration point to 2, it gave wrong result ( structure was more flexible; first pe...