Seismic performance of single-story subway station structures with different types of intermediate columns

In view of the seismic weak component of the single frame type underground subway station structure, using the rectangular reinforced concrete columns, the circular reinforced concrete columns, and the proposed precast concrete-filled steel tube (CFST) columns with quick connection devices, a three-dimensional global time-domain finite element analysis model for the nonlinear statically and dynamically coupled soil-main structure interaction is established. The influence rules of the interlayer displacement angle, seismic damage and dynamic stress response of the main structures of the subway station are compared and analyzed when different types of intermediate columns are adopted. The results show that compared with the rectangular columns, the circular columns with equal moment of inertia suffer less damage in earthquakes, and have better seismic performance. The proposed precast CFST columns with quick connection devices can effectively ensure that the columns in the structures will not be seriously damaged in strong earthquakes. They can be quickly replaced after earthquakes so as to improve the overall seismic performance of the underground subway station structure.