Analysis of Elastic-Plastic Dynamic Response of Subway Station Structure in Sand and Gravel Strata
This article focused on the study of underground structures of subway stations in sand and gravel strata.A soil-structure interaction-based finite element analysis model was established.Nonlinear dynamic time history analysis method was used to simulate the structure's response under horizontal seismic motion and horizontal-vertical coupled seismic motion.The results show that inter-story displacement and horizontal acceleration responses of the structure are less affected by the vertical component of the seismic motion.However,additional vertical seismic motion can significantly increase the axial force of critical sections of the structure and reduce overall seismic performance,and the lower nodes of the sidewalls,the top of the middle column,and the top plate area exhibit weak seismic performance.The above findings could provide reference for seismic design of underground structures in gravel layer site in Southwest,China.
subway stationsand and gravel strataseismic responsenumerical simulation
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