Is it possible to combine S.A.M. load case (S1..S10) with a static seismic load case (E1..E30) in AutoPIPE?
Yes it is possible, but why ?
AutoPIPE will do exactly what you tell it to do. Therefore if you are specify a Static Seismic case and a SAM case, then create a combination to combine these results the application will do just that. However the user is cautioned to understand exactly what is happening, how the loads are being applied, and if it makes sense to combine such load cases.
In this example, recall how the loads are applied to the system
SAM - applied as impose support displacement to the base anchor. Movement will be affected by the spring stiffness of the anchor / support.
Static Seismic - Static seismic loads are given in factors of gravity, g. As an example, if a static seismic acceleration of 0.5 g's is applied on the x-axis, a force equal to half the systems weight is turned into a uniform load in the x-direction.
Finally, one could create any number of combination that would combine them together.
Example: Gr+E1+S1
Note, use caution to completely understand what loads are being combined, the type of analysis (Linear / Nonlinear), and if the results make sense.
SAM is a pseudo dynamic analysis so we believe it should only be combined with response spectrum. The static earthquake approach is only recommended for low rise buildings which do not twist significantly, and which will respond in its fundamental mode of vibration. So the idea of different floors moving in different ways doesn't really apply here. However, we do have the Static Earthquake Scale Factors that can be used to apply different G values to different areas of the piping when running the static earthquake analysis, if the user wishes to do so.
"Static Earthquake" - AutoPIPE Load Case
Bentley AutoPIPE