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Response-spectrum analysis (RSA) is a linear-dynamic st= atistical analysis method which measures the contribution from each natural= mode of vibration to indicate t= he likely maximum seismic response of an essentially elastic structure. Res= ponse-spectrum analysis provides insight into dynamic behavior by measuring= pseudo-spectral acceleration, velocity, or displacement as a function of s= tructural period for a given time history and level of damping. It is practical to envelope response spectra such = that a smooth curve represents the peak response for each realization of st= ructural period.
Response-spectrum analysis is useful for design decision-making because = it relates structural type-selection to dynamic performance. Structures of = shorter period experience greater acceleration, whereas those of longer per= iod experience greater displacement. Structural performance objectives shou= ld be taken into account during preliminary design and response-spectrum an= alysis.
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