The 'response spectrum' analysis for seismic design gives maximum response as a function of:
Choose the correct answer
Frequency of loading force only
Natural period T (and damping ζ) — peak SDOF response for given T/ζ under design ground motion; used for MDOF by modal superposition
Building height alone
Rainfall intensity
Correct Answer
B. Natural period T (and damping ζ) — peak SDOF response for given T/ζ under design ground motion; used for MDOF by modal superposition
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Response spectrum: curve of maximum response (acceleration, velocity, or displacement) for SDOF systems of varying natural period T, all with the same damping ratio ζ, subjected to the design ground motion. Read-off: for given T and ζ, find Sa/g (spectral acceleration). IS 1893 provides design response spectra for different soil types. For MDOF: CQC or SRSS combination of modal maxima.
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