Take a look at the Help Topic - Reference Information - Analysis Considerations - Seismic Anchor Movement analysis. The crux of the issue as I see it is that the SAM analysis is a linear static analysis, so it can't be combined with a dynamic response spectrum analysis, but if the dynamic response spectrum analysis is set up to use MSRS, then an independent support motion analysis is performed. For an example of using MSRS Analysis, please refer to the 'AutoPIPE_MSRS_Example1.pdf' in the 'Examples' folder located within the program folder, the example file is also included.
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