基于 pushover 法的地铁车站柱墙剪力比研究

As an important seismic performance index, the inter-story drift radio is often used to evaluate the horizontal displacement of the above ground or underground structure to ensure the stiffness in serviceability states. However, because the underground subway station structure is buried in soil and constrained by the surrounding soil, the inter-story drift radio during earthquake is small and difficult to control and monitor. In view of this, based on the finite element program ABAQUS, the nonlinear soil-structure-interaction model is established in this paper, and the elastoplastic pushover analysis is carried out. The whole process curve of shear force - story drift of each structural component is obtained, and the key performance points and their thresholds are further determined. The shear distribution between column and sidewall in different performance states of station structure is also studied. Results show that the column in lower story first enters the failure state; the shear force of column in lower story increases first and then decreases, but compared with the side wall of the station, the proportion of story shear force allocated to the column has been decreasing. On this basis, the normalized shear ratio of column to sidewall is proposed as a mechanical index to evaluate the seismic performance of subway stations, which can effectively make up for the deficiency of single displacement index.