Discussion
The first step in a response spectrum analysis is to
Answer: B
Correct answer: determine the natural periods and mode shapes
Everything else depends on them: the spectral ordinate is read at each modal period, the modal forces follow from the mode shapes and participation factors, and the combination rule needs the periods to judge how correlated the modes are. Scaling accelerograms belongs to time-history analysis, and member strengths are checked after the demands are known.
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