Analysis Of Seismic Dynamic Response Of Rectangular Subway Station Structure

In recent years,the underground structure has become an indispensable and important part of the city's construction.Whether it is underground pipelines or subway tunnels,the city's energy and transportation aspects can be further optimized.However,there are still many problems that need to be solved in the development of underground structures,especially the earthquake resistance problem.Since the Hanshin subway station caused great damage and secondary disasters under the action of the earthquake in 1995,the earthquake resistance problem of underground structures has become an underground structure.Important issues of design concern.This article takes a subway station in Shenyang as the engineering background and uses Midas finite element software to analyze the seismic response and influencing factors of the subway station.The specific research contents and results are as follows:This paper sorts and analyzes the basic theory and key issues of finite element analysis of underground structures,and finds a reasonable calculation method to provide a guarantee for the correctness of the results of finite element analysis.The basic assumptions of the finite element model,the infinite simulation of soil,the choice of constitutive relationship,the selection,input and adjustment of seismic waves are determined through literature.In this paper,based on the basic theory of finite element,a three-dimensional finite element model of the interaction between the structure and soil of a rectangular double-layer subway station in Shenyang was established.It was found that the weaker position of the station under the action of the earthquake occurred on the slab and column and the slab and the side wall The seismic response of subway station structure is also very different under the action of different seismic waves at the intersection position and the same acceleration peak.The difference between the two-dimensional model and the three-dimensional model is analyzed to verify the feasibility of the two-dimensional model for the analysis of the influencing factors of the seismic dynamic response of the station structure.In this paper,a two-dimensional soil-structure finite element model is established for a double-layer rectangular subway station.Under the condition that other parameters of the soil are unchanged,the softness and hardness of the soil are controlled by changing the shear modulus of the soil,and the softness and hardness of different soil layers are studied.Degree of influence on the seismic response of underground structures.The results show that the impact of changes in the softness and hardness of the soil in the upper and lower layers of the station on the seismic response of the station is not isolated,but interrelated.The change in the shear modulus of the station's overburden on the station structure earthquake The impact of the response is small.The impact of the change in the hardness of the soil under the station on the earthquake of the station structure is related to the softness and hardness of the overlying soil at the station.In this paper,by changing the position and height of the adjacent structure,we observe its effect on the seismic dynamic response of the underground structure.The results show that the adjacent structure without basement has the greatest influence on the underground structure.When the adjacent structure exists in the basement,it can restrain the vibration of the soil around the station to a certain extent.As the height of the adjacent structure and the distance between the adjacent structure and the underground structure change,the seismic response of the underground structure will also be affected accordingly.The height of the adjacent structure is between 0.8B-1.6B(B is the width of the station section).The seismic response of the underground station structure increases continuously with the height of the adjacent structure,but when the height of the adjacent structure is 2B,the impact begins to become smaller;The adjacent structure within 0.2B of the underground structure has a greater impact on the seismic response of the underground structure.At 0.4B,the impact is greatly reduced,and L=0.4B can be regarded as a safe distance.