The Seismic Design Method Research Of City Underground Space Structure

With the development of Chinese economy and big cities,the pattern of the subway station and the underground commercial street in large cities appeared one after another,we need the industry do the analysis and the research that How to ensure that underground space structures can not occur serious damage under the seismic effect?What kind of calculation method for the calculation and which case will be more effective to accurately calculate the seismic effect of structural earthquake.Through applying the finite element software—ANSYS and ABAQUS in this article,I establish proper three-dimensional and two-dimensional finite element model of "Lanzhou Metro Rail Transit Line No.1 and the affiliated development of large-scale underground space".In the same time,based on the dynamic time history and the response displacement method,I separately analyze the seismic response of the structure,compare the accuracy of the structural seismic response calculated by different methods,and compare and analyze the seismic response of the adjacent structure of underground commercial street and subway tunnel so as to guide similar engineering practice.The main research results of this paper are as follows:(1)Taking the Subway station and commercial street in the city of Lanzhou Olympic Sports Center Subway Station in the middle of the building structure as an object of study and using the equivalent uniform viscoelastic boundary conditions.I analyzed the structure performance of combination building structure in the threedimensional dynamic response.The study find that the combination building structure in seismic response under different seismic waves are basically the same,and the connection structure of side wall and roof plate bending great damage.(2)By comparing the result of the response displacement methods,the internal force result of the combination building structure by the response displacement methods and the dynamic time history method tend to be consist.But the value is a little small.(3)Comparing the combination building structure of the different buried depth,The calculation accuracy of the reaction displacement method is consistent with the result of the dynamic time history method when the buried depth is shallow,and the calculation error increases with the increase of the buried depth.the calculation accuracy of the response displacement method in the calculation precision of buried depth is shallow consistent with the results of the dynamic time history method,with the buried depth increases,increases the calculation error.(4)In view of the characteristics of the subway crossing tunnel across the underground commercial street in the west section of the underground space.the seismic response and interaction between the upper and lower commercial streets and interval tunnels are analyzed by using the dynamic time history method.Under the action of earthquake load,the structure of underground commercial street will reduce the moment value of shield tunnel structure under the close distance subway section,and play a role in restraining the tunnel.And the structure of the subway tunnel on the underground commercial street has no effect on the structure of the commercial street.