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STAAD Commands and Input Instructions
Section 5
5-174
The advantage of this command is that one may find the amount of
structural response generated from a specific mode or a set of
modes. For example, if 50 modes are extracted, but the effect of
just the 40
th
to the 50
th
mode in a response spectrum analysis is to
be determined, one may set the active modes to be 40 through 50.
The results will then be devoid of any contribution from modes 1
through 39.