Study On 3D Dynamic Response Of Large Subway Station Under Earthquake

With the increasing scale of city,the inconvenience caused by urban traffic congestion has caused great inconvenience.At the same time,it has also restricted the development of urban economy.With this series of new problems becoming increasingly prominent,therefore,improving the quality and efficiency of travel has become a focus issue that restricts urban development.As a new mode of transportation,the subway has gained more and more recognition from people,especially in densely populated large and medium-sized cities.Since the opening of the first subway line in China in 1969,China's subway construction has achieved rapid development in recent decades.However,since most of the cities in China are in seismic regions with seismic intensity of more than seven degrees,the impact of the disaster on the subway during the earthquake destruction is also the focus of current experts and scholars.This thesis is based on the basic theory of soil-underground structural dynamic analysis,and refers to the classical elasto-plastic constitutive model of soil,the Mohr-Coulomb strength theory,and the research background of the main structure of the metro station of the two rivers in the metro station of Qingdao City.The equivalent viscoelastic artificial boundary was intercepted and a three-dimensional finite element model of the subway station was established using the finite element software ABAQUS.The static analysis and seismic wave dynamic response analysis under the action of self-weight were established to reflect the changes in the stress,strain and internal forces of the main structure of the subway station.In the dynamic analysis,the classical horizontal seismic wave El-centro wave and Loma-Prleta wave are selected,and the dynamic response of the soil-structure system under different loading conditions is taken into account in consideration of the rare and multiple operating conditions respectively,and the safety of the subway station is also considered.Based on the research in this paper,it is shown that when the subway station is in the static state,the stress values at different positions of the pillars and the stress values at different nodes of the side wall are compared.Analyze the position of the most unfavorable force under static load and provide reference for engineering design.Under the action of earthquakes,the influence of different seismic waves on the dynamic responses of pillars,slabs and side walls at various levels of subway stations was analyzed.Some conclusions with reference value were obtained by comparison with static load analysis,and the safety of station structures was analyzed.