| As our economy developing rapidly,the people who live in the city,no matter big or small,being more and more worried about the heavy traffic,urban subway project has become a part of life,but the earthquake disaster is a threat to the life and property of the people,people suffer from the sudden earthquake,and once underground structure is destroyed,the emergency work will become more difficult because of a large number of people who are active in the station,in addition it will take a lot of labor and money to the work of restoring the subway station,so it is very important to study on the response of the subway station under the earthquake.Based on the engineering background of a subway station in Shijiazhuang,the object of the study is the station-duct transition section,the responses under the earthquakes are analyzed on the structure.(1)Building subway station structure model of subway station with connecting air duct structure,the vertical stress and vertical displacement are analyzed under the static loading.Compared with structure that there is not duct,the vertical stress and vertical displacement increase and stress concentration appears significantly.(2)The applicability of the three methods on seismic analysis that it consists of response displacement method,time history analysis method and response acceleration method.Combined with the engineering practice,then,the time history analysis method is chosen to complete seismic response analysis.The horizontal accelerations of EI wave,Taft wave and Tianjin wave are applied in the three dimensional finite element model,in the earthquake and rare earthquake loads,the results of the earthquake off the horizontal displacement,the acceleration response and stress are analyzed.Under the same seismic waves but the different acceleration peak,the structure changes are similar,but in the frequent earthquake,the horizontal displacement and stress are far less than the force of rare earthquake,the stress and deformation amplitude of station that setting up duct are much larger than the station without duct,but the acceleration response amplitude is reduced.(3)As for the subway station-the air duct connection structure applying deformation joint,analyzing the distinguishes of stress and displacement,in the static load,the vertical displacement is increased and the vertical stress is decreased on the structure that setting of deformation joint.In the rare earthquake,the setting of deformation joint can improve the flexibility of the entire structure and the stress is reduced,at the same time the seismic capacity of the structure is improved. |
