Our experience is that with friction under seismic you tend to get higher loads on your supports, guides etc and without friction under seismic you tend to get higher loads on your anchors. Hence when we run AutoPIPE we run the model twice, once with friction under seismic and once with no friction under seismic and then compile all the results to get the highest loads. In CAESAR II we are still not confident how to set up the load cases to run the no friction under seismic case.