Discussion
Time-history analysis of a building requires, in addition to the structural model,
Answer: A
Correct answer: one or more ground acceleration records
Time-history analysis computes the response at every instant, so it needs the excitation at every instant - a digitised accelerogram, not a summary of it.
A response spectrum, a peak ground acceleration or a zone factor are all condensations of ground motion into a single number or curve, and none can be integrated. Codes generally require several records, scaled and matched to the site's spectrum, because the response to a single record is sensitive to its particular sequence of pulses.
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