A simplified time-history seismic analysis method for underground structures based on forced displacement

Abstract

The traditional dynamic time-history analysis method is widely adopted in seismic analysis and design of underground structures, but it presents complex parameters and relatively high calculation costs. Therefore, a simplified time-history seismic analysis method for underground structures was proposed based on the traditional forced response displacement method. The implementation procedure, parameter determination, and main features of the method were introduced in detail. The full-range seismic response of underground structures can be obtained, and the dynamic soil-structure interaction could be appropriately considered with the method. The seismic responses of a typical subway station were analyzed using the proposed method. The calculating results were compared with that of the traditional dynamic analysis method, which showed that the lateral boundary distance of the pseudo-static analysis model could significantly affect the results of the proposed method, and the relevant suggestions were given. When the distance of the lateral boundary was taken as the width of the structure, the simplified pseudo-static time-history seismic analysis method had reasonable calculating accuracy and efficiency, which can be applied for the seismic response analysis and design of underground structures.