Reza Jafari

In time domain analysis, we can apply acceleration. In ansys workbench, boundary condition is all body! How come it is in dynamics formula? What is the rational or details of this way?

In this method, can we consider fixed boundary or not?

When I change "base excitation" to "yes" to apply earthquake acc, then I cannot select arbitrary BC!

I think another way is, using seismosignal. we can extract displacement and velocity of recorded acc and the utilize these instead of seismic loading to assign arbitrary target. My means, using displacement or velocity as a loading.