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论文类型：期刊论文

发表时间：2013-07-01

发表刊物：COMPUTERS & STRUCTURES

收录刊物：SCIE、EI

卷号：123

页面范围：39-47

ISSN号：0045-7949

关键字：Non-stationary; Base-isolated buildings; Equivalent linearization method; Pseudo excitation method; Reduction of hysteretic components

摘要：Based on reduction of the number of the equivalent linearization differential equations, an efficient approximation method is presented for the computation of the stochastic non-stationary response of base-isolated buildings represented by large Finite Element models. The analysis combines the pseudo excitation method and the equivalent linearization method. In the stochastic analysis, it is supposed that the superstructure of the isolated system remains elastic even when subjected to a major earthquake ground motion, and so the modal superposition method is used to reduce the number of degrees of freedom of the system. Meanwhile the static correction procedure is employed to consider the contributions of the higher modes of the structure, with minimal increase in computation effort. The proposed method can deal with different types of isolators, and obtain the performance of each isolator during the earthquake. However the number of the equivalent linearization differential equations is reduced greatly by assuming that isolators of the same type have equal hysteretic components in the same direction. This improves the computation efficiency and accuracy. Finally, the stochastic response of a simple base-isolated frame structure is obtained by both the Monte Carlo method and the pseudo excitation method presented, in order to verify the accuracy of the latter even for large finite element structures with many hysteretic devices. (C) 2013 Elsevier Ltd. All rights reserved.