Influence of the diaphragm wall on the earthquake responses of the underground station structure under two different connection types

Two types of connection methods are often used to connect the diaphragm wall with the side wall of underground subway station. In this paper, the different seismic response of underground subway station caused by different connection types is studied by the finite element method. As a result, the connection types between the diaphragm wall and the subway station have great influence on the seismic response of the underground station structure, such as the interlayer displacement angles, the lateral displacement response, the seismic damages of structure, and so on. The tie connection type should greatly increase the lateral resisting stiffness of the underground subway station, which should alleviate its seismic damages as a whole. However, the tie connection type should also aggravate the earthquake damages of the top and bottom plates near to the side wall. The above findings should be recognized in the seismic design of underground subway station.