Seismic response of the subway station due to a specific active fault

Abstract

In this paper, seismic response of a subway station structure was analyzed using a fault-structure system, which was performed in a two-step process. First, the strong ground motions induced by the specific active fault were synthesized using the revised empirical Green’s function (EGF) method at a geologic-length scale. Then, the synthesized seismic waves were used as the input seismic excitations for the dynamic response analysis of a subway station structure at an engineering-length scale. The maximum story drift deformation was calculated by finite element methods. The calculated results indicate that the maximum story drift angles of the subway station have a linear correlation with the peak ground displacements, which are different from the surface structures. Correlation between maximum story drift angles and the flexibility ratio were discussed at last. The results show that subway stations with smaller flexibility ratio suffer smaller story drift deformation. For underground structures with small flexibility ratio, the decreasing of frictional coefficients of the interfaces between the underground structure and the surrounding soil would decrease the maximum story drift deformation.