Seismic Research Of Subway "T" Type Transfer Station Based On Time History Analysis Method

With subway construction enters the golden period in our country,the transfer subway station between each line is very important,and the overlapping transfer mode is the most widely used transfer mode at present.Along with the increasing number of subway station,and the frequent earthquakes in recent years,to enhance the stability of the subway station under earthquake load has become the current subway is urgently in need of solution in the construction of large-scale problems.The interchange station is large,with complicated structure and large passenger flow.If it is not verified by seismic design,it will cause great loss if it is destroyed in the earthquake.Therefore,it is of great significance and application value to study the earthquake damage and damage mechanism of cross node transfer station.This paper,taking Chengdu metro line 8 and line 2 of the overlapping T-shaped station Dongda Road station structures as the research object,using the finite element software ABAQUS to establish two-dimensional and three-dimensional finite element dynamic analysis model,using time history analysis method to analysis seismic response law of the station structure.The main research contents of the paper are as follows:(1)Based on dynamic theory of dynamic time history analysis and damping theory,seismic wave selection and input,material constitutive,boundary conditions,a detailed analysis of problems such as the modeling conditions were determined,thus to establish two-dimensional second three across the station structure,two-dimensional floor three across the station structure and the three-dimensional finite element model of the structure of the station.(2)The static analysis of two-dimensional and three-dimensional subway stations is conducted respectively.The analysis results show that the stress of the column is the largest,especially the lower column.In the side wall and the bottom of the wall,the force is larger,and the rest of the side wall is less stressed.(3)Of two-dimensional second and third floors underground station on seismic dynamic response analysis of the results show that different seismic wave input,internal force and displacement response of subway station structure differences,in the same vertical position at different heights,the structure of the vertical displacement,lateral displacement increases gradually with the increase of height.(4)Structure for the whole station three-dimensional numerical model is established,the calculation results show that cross interchange station,and mutual restraint between the horizontal displacement and internal force of the same height with the vertical line from the intersection node distance increases with the increase gradually.At the transfer node,the top plate,the middle plate and the base plate are stressed.(5)The results of dynamic calculation of the structure of two-dimensional and three-dimensional subway stations show that,in the structure of subway station,the middle and side walls of the subway station are more stressed than the roof,the middle plate and the bottom plate.