Abstract: To investigate the seismic response of a prefabricated metro station in different site conditions, a threedimensional static and dynamicallycoupled nonlinear finite element model of a prefabricated metro station is established based on finite element software. Then, the seismic response of the fabricated metro station under different site conditions, peak accelerations of seismic waves, and vertical seismic waves is systematically analyzed. Finally, the acceleration, deformation, stress, and plastic damage laws of the fabricated metro station are obtained. The results demonstrate that: (1) The horizontal displacement difference between top and bottom of the station structure and the opening angles of the joint gradually increase as the site conditions change from category Ⅱ to category Ⅲ, and the growth rate gradually increases, but the opening angles of the joint are maintained at a low level(less than 0.10°), verifying the stability and safety of the joint. (2) The waist and shoulder of the top arch and the envelope structure near the sidewall are prone to plastic damage in site condition category Ⅲ. (3) Compared with singlehorizontal seismic waves, the deformation, stress, opening angles of joint, and plastic damage of the fabricated metro station will be significantly increased by increasing the horizontal seismic waves. Generally, under site condition category Ⅱ and an input peak acceleration of seismic waves of 0.1〖WT5《TNR#I》〗g〖WT５《TNR》〗 and 0.2〖WT５《TNR#I》〗g〖WT５《TNR》〗, the structure is basically in a flexible working state; whereas under site condition category Ⅲ and an input peak acceleration of a seismic wave of 0.4〖WT５《TNR#I》〗g〖WT５《TNR》〗, the prefabricated metro station is in a plastic working state and the area of the plastic zone is large.

Key words: prefabricated metro station, site classification, seismic response, numerical simulation