This model has many issues like badly shaped plates, zero length members, orphan nodes, etc. which can be identified using Check options in the Tools menu. I am wondering how did you manage to create such model? Or the model does not have such issues till the analysis is performed?
If you have such, please send us the model before it gets corrupted.
One more thing - you should set DM (damping) value as 0.05 in the seismic definition instead of 5.
If you have such, please send us the model before it gets corrupted.
One more thing - you should set DM (damping) value as 0.05 in the seismic definition instead of 5.