Research On Seismic Mitigation And Isolation Performance Of Subway Station Based On Integral Response Displacement Method

This paper analyzes the deformation of the Dakai station damaged by the Hanshin earthquake,uses the integral response displacement method to study its internal force and displacement,and analyzes the necessity of seismic isolation of subway stations.Combined with the geological conditions of the Luoyang subway project,through numerical analysis of the integral response displacement method and model test,the isolation effect of the seismic isolation layer is analyzed,and the thickness and distance parameters of the seismic isolation layer are optimized and analyzed.The main work and research conclusions are as follows:(1)Using the integral response displacement method,conduct seismic analysis of Dakai Station and study its internal force and displacement changes.The research results are compared with the research results of Hiroto and domestic scholars to verify the applicability of the integral response displacement method in MIDAS modeling.And using this method to study the seismic isolation effect of the seismic isolation layer of the subway station.(2)Research and analyze the seismic isolation effects of different seismic isolation materials under the action of seismic waves with peak accelerations of 0.1g,0.2g,and0.4g.The roof and floor displacement and internal force results of the structure show that under the action of various peak acceleration seismic waves,EPS has a seismic isolation rate of 20%-30% for the internal force of the structure,which has a good seismic isolation effect.It is used in the seismic isolation and reduction of subway stations.Can be used as one of the options for seismic isolation.(3)Using the integral response displacement method,the dimensional parameters of the EPS isolation layer were optimized.In this paper,from the two angles of thickness and relative distance from the station,different seismic isolation layer thickness and relative distance are set to compare the seismic isolation effect under various working conditions.The numerical results show that under the working conditions set in this paper,the isolation effect is better when the thickness of the isolation layer is 1.4m,and the relative distance between the isolation layer and the subway station is 6m.(4)Carried out the model test of the parameter optimization of the seismic isolation layer under the condition of sandy soil layer.Using intelligent monitoring methods,the floor acceleration of the station model under various working conditions was analyzed and compared.The test setting conditions and results show that when the thickness of the seismic isolation layer is 1.0cm,the seismic isolation effect is better;when the distance between the seismic isolation layer and the station is 5cm,the seismic isolation performance is the best.By comparing with the results of the numerical study,it is obtained that the change law of the seismic isolation effect of the model test seismic isolation layer is basically the same,which verifies the correctness of the model test.Based on the integral response displacement method,this paper compares and analyzes the seismic isolation performance of different seismic isolation materials,and conducts a study on the optimization of the location parameters of the seismic isolation layer.Through the model test,the correctness and feasibility of the numerical simulation are verified.The research in this article provides a reference for the seismic isolation construction of subway stations in the future.