Case study on the seismic response of a subway station combined with a flyover
Qi Wang, Ping Geng, Xiangyu Guo, Xinqiang Wang, Peisong Li, Bing Zhao
Abstract
With the rapid development of urban traffic networks, subway stations will inevitably be constructed close to other structures in the future. The subject of this study is a new subway station in China, combined with a flyover standing on the roof, owing to its unique structural design. Based on the time history-analysis method, the dynamic responses of the subway station, piers, and piles under seismic conditions were examined. The results show that the internal force and deformation of the underground structure vary under seismic excitation in different directions and are more dangerous in the under transverse excitation than under longitudinal excitation. Moreover, the dynamic response of the underground structure is severe under the action of low-frequency-rich Wenchuan waves, and the resonance effect is distinct. The load of the bridge was found to inhibit the deformation of the underground structure to a certain extent. Furthermore, the mid-pillar and slab-mid-pillar connections are the weakest parts, and special attention should be paid to their seismic design. Meanwhile, the piers and piles can maintain good working condition under the action of an earthquake with the peak acceleration of 0.1g.