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论文类型：期刊论文

发表时间：2010-06-01

发表刊物：EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION

收录刊物：SCIE、EI

卷号：9

期号：2

页面范围：201-211

ISSN号：1671-3664

关键字：multi-support excitation; spatial correlation; power spectrum-compatibility; non-stationary; ground motion simulation

摘要：A spectral-representation-based algorithm is proposed to simulate non-stationary and stochastic processes with evolutionary power, according to a prescribed non-stationary cross-spectral density matrix. Non-stationary multi-point seismic ground motions at different locations on the ground surface are generated for use in engineering applications. First, a modified iterative procedure is used to generate uniformly modulated non-stationary ground motion time histories which are compatible with the prescribed power spectrum. Then, ground motion time histories are modeled as a non-stationary stochastic process with amplitude and frequency modulation. The characteristic frequency and damping ratio of the Clough-Penzien acceleration spectrum are considered as a function of time in order to study the frequency time variation. Finally, two numerical examples are presented to validate the efficiency of the proposed method, and the results show that this method can be effectively applied to the dynamic seismic analysis of long and large scale structures.