Reply To: Why does calculation of F = KU using exported Kmatrix only work for simple model

[dlooman]

In what way was the slightly more complex model more complex?  Just more nodes and elements or did it include contact, some other nonlinearity or more complicated boundary conditions?  In general, transient results will be affected by dt.  At some point dt is smaller than the shortest significant period of the response and then the results will stop changing.