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Date of Publication:2011-01-01

Journal:振动与冲击

Issue:12

Page Number:103-107

ISSN No.:1000-3835

Abstract:Because of exploitation of urban underground space recently, a lot of large-scale subway stations were built. So, a new issue appeared for engineering design. The procedures for artificial simulation of multi-point seismic waves based on the code response spectrum were presented here. The generated seismic waves were spatially correlated to the ground motion, and had the double non-stationary properties of strength and frequency. The three-dimensional numerical models of a subway station were established under three different site conditions, and the infinite domain of soil was simulated with an infinite element. On this basis, the seismic responses of the subway station under non-uniform ground motion were analyzed compared with those under uniform seismic excitation. The results showed that horizontally relative displacements between top and bottom at different axial sections of the subway station have a great phase difference in soft sites because of non-uniform seismic action, and the effect on the dynamic stress of the side wall is great; the influence of the non-uniform feature on the dynamic response of the station is insignificant in medium hard sites and hard sites; a suggestion is given that the spatially multi-support earthquake excitations must be considered in the seismic analysis of a large-scale subway station in soft sites.

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