Research On The Influence Of Municipal Bridge To The Subway Station On The Seismic Response

At present, China began to strive to develop underground transport, especially the subway project, which has become an important part of the urban lifeline. Typically, underground structure has good anti-seismic performance, so the earthquake disasters are fewer. However, once the underground structure is destroyed by earthquake, the loss will be serious and the structure is difficult to repair. In 1995, Daikai subway station was badly damaged that makes people gradually realized that the anti-seismic performance of underground structure was not as good as being expected. In order to facilitate people to travel, the subway stations often locate close to prosperous commercial street, residential area and transport facilities. Some subway stations are surrounded by constructions, even some are under the bridge and the tunnel. Therefore, anti-seismic performance of the subway station and the influence of surface buildings on it become urgent problems to solve. This dissertation is based on this background, major studies are as follows:(1) Firstly, this paper describes its background and significance, displays the characteristics of earthquake disasters in underground structure, systematically summarizes the research methods and contents of underground structure seismic damage, objective problems of all kinds of seismic analysis and calculation method are reviewed, and put forward the research content and the goal.(2) Describes the basic theory of soil-structure dynamic interaction, Drucker Prager-model of soil and plastic damage model of concrete in ABAQUS, which lay the foundation for the dynamic material nonlinear finite element analysis of underground structures.(3) The two-layers-three-cross-island subway station is selected as the research object, which is often adopt in the subway construction. Make a nonlinear dynamic response analysis of the subway station. The response results of station are given under the different seismic waves and seismic peak acceleration. The results include relative displacement, horizontal acceleration and stress, and the responses of the station structure are summarized.(4) A systematic study of the anti-seismic performance of subway station through existing bridge is carried out. The dynamic response change of underground subway station is studied for two cases whether through the existing bridge. The relevant results are given which includes the acceleration, the relative displacement and stress, also analyzes the tensile plastic damage development process of the station. Finally the results and the influence of the factors to seismic response of the existing bridge is studied, which include soil stiffness, characteristics of the contact between the bridge and the subway station and relative position.