Hey. I’m doing a response spectrum analysis as per section 12.9 of ASCE7-05. It does not address how to distribute the seismic base shear (like the equivalent lateral force procedure does). As I recall, there is some formula to use (i.e. F(level)=participation factor x mode shape vector x acceleration x etc.,etc.). Does anyone have an opinion on this? Does STAAD perform this for you?
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