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Shock and Vibration
Volume 2014, Article ID 401469, 11 pages
http://dx.doi.org/10.1155/2014/401469
Review Article

Seismic Response of Base-Isolated High-Rise Buildings under Fully Nonstationary Excitation

1State Key Laboratory of Structural Analysis for Industrial Equipment, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian 116023, China
2Bridge Science Research Institute Co. Ltd., China Railway Major Bridge Engineering Group, Wuhan 430034, China
3Earthquake Engineering Research and Test Center, Guangzhou University, Guangzhou 510405, China

Received 26 November 2013; Revised 12 January 2014; Accepted 28 February 2014; Published 24 June 2014

Academic Editor: Jeong-Hoi Koo

Copyright © 2014 C. F. Ma et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Stochastic seismic responses of base-isolated high-rise buildings subjected to fully nonstationary earthquake ground motion are computed by combining the pseudoexcitation and the equivalent linearization methods, and the accuracy of results obtained by the pseudoexcitation method is verified by the Monte Carlo method. The superstructure of a base-isolated high-rise building is represented by a finite element model and a shear-type multi-degree of freedom model, respectively. The influence of the model type and the number of the modes of the superstructure participating in the computation of the dynamic responses of the isolated system has been investigated. The results of a 20-storey, 3D-frame with height to width ratio of 4 show that storey drifts and absolute accelerations of the superstructure for such a high-rise building will be substantially underestimated if the shear-type multi-degree of freedom model is employed or the higher modes of the superstructure are neglected; however, this has nearly no influence on the drift of the base slab.