Analysis Of The Factors That Affect The Seismic Response Of The Underground Subway Structure Which Bears Bridge

As the great development of urban mass transit system, a question is getting more and more important in both economic and society, which is the study research on the field of the seismic loads or earthquakes that act on the underground structures. Urban metros take a great chance to cross closely or beneath the up-ground structures. The article studies the seismic reaction of the metro station structure which bears a bridge structure. The study work includes below:(1) Introduce methods of soil-underground structure seismic analysis system. And introduce the process developments and characteristics of all the methods, including their advantages and disadvantages. Also make a brief introduction about choosing the seismic wave and how to correct the wave.(2) With the roof of an underground structure and the basement of an up-ground structure attached, the underground structure gets different seismic reaction influenced by the ratio of the attachment square and the thickness of the roof. The article studies on the reaction.(3) Based the studies and the analyses mentioned upon, conclude that:enlarging the attachment square can be benefit to decrease the harmful influence to the underground structure caused by the structure upon it. At the same time, structure had better be located in a proper soil layer. Thickness of the roof has little influence to the structure’s seismic reaction.(4) According to the real engineering of the Sihuanlu Station of line Fang Shan, Beijing Metro, the article figures the structural calculation with the response-displacement method, and carries out the 3D finite numerical model analysis to analysis its stress and the seismic responese.