Seismic vulnerability analysis of subway station based on two-parameter model

Abstract

In order to study the dynamic response and damage status of subway station structure under earthquake, we establish a numerical model of nonlinear dynamic system of subway station under saturated sand soil. By using the incremental dynamic analysis method, we select the inter-story displacement drift angle and deformation-energy index of a two-parameter model to investigate the seismic vulnerability of the subway station structure and thus to obtain the exceedance probability of the limit state of subway station structure under different seismic intensities. The results show that when the peak ground acceleration (PGA) is less than 0.2g, the structure is safe and the damage is mainly mild; when PGA is greater than 0.2g, the damage is moderate and more severe. The maximum deformation plays a major role in controlling the structural damage when the structural damage degree is mild (slight or moderate damage). When the damage of the structure is serious (serious damage or collapse), the cumulative hysteretic energy consumption plays a key role in the damage of the structure. The research can provide reference for disaster prevention and seismic design of subway station structure.