Earthquakes and Structures

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Seismic response of single-arch large-span fabricated subway station structure

  • He, Huafei (School of Civil Engineering, Beijing Jiaotong University) ;
  • Li, Zhaoping (School of Civil Engineering, Beijing Jiaotong University)
  • Received : 2021.12.22
  • Accepted : 2022.07.22
  • Published : 2022.07.25
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Abstract

A new type of fabricated subway station construction technology can effectively solve these problems. For a new type of metro structure form, it is necessary to clarify its mechanical properties, especially the seismic performance. A soil-structure elastoplastic finite element model is established to perform three-dimensional nonlinear dynamic time-history analysis based on the first fabricated station structure-Yuanjiadian station of Changchun Metro Line 2, China. Firstly, the nonlinear seismic response characteristics of the fabricated and cast-in-place subway stations under different seismic wave excitations are compared and analyzed. Then, a comprehensive analysis of several important parameters that may affect the seismic response of fabricated subway stations is given. The results show that the maximum plastic strain, the interlayer deformation, and the internal force of fabricated station structures are smaller than that of cast-in-place structure, which indicates that the fabricated station structure has good deformation coordination capability and mechanical properties. The seismic responses of fabricated stations were mainly affected by the soil-structure stiffness ratio, the soil inertia effect, and earthquake load conditions rarely mentioned in cast-in-place stations. The critical parameters have little effect on the interlayer deformation but significantly affect the joints' opening distance and contact stress, which can be used as the evaluation index of the seismic performance of fabricated station structures. The presented results can better understand the seismic responses and guide the seismic design of the fabricated station.

Keywords

Acknowledgement

This research is funded by the National Natural Science Foundation of China (No. 51678033), Fundamental Research Funds for the Central Universities (No. C20JB500160). Their supports are gratefully acknowledged.

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