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An improved probabilistic spectrum superposition
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DOI：10.1016/S0267-7261(97)00030-4.png)
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Several investigations have been concerned with the statistics of peaks in the seismic response of multi-degree-of-freedom (MDOF) structures when all the peaks are arranged in decreasing level of amplitude. The present paper suggests improvements in the probabilistic formulation adopted in such studies. With these improvements, the probabilistic spectrum superposition approach becomes more accurate and convenient to use in practical applications. By computing the response of a five-story example building excited by several real accelerograms with differing frequency and nonstationary characteristics, it is shown that the probabilistic approach is able to predict accurately the amplitudes of several significant response peaks, corresponding to the strong-motion stationary part of input excitation. (C) 1997 Elsevier Science Ltd.
Keyword:
probabilistic response
spectrum superposition
stochastic mechanics
random vibrations
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