Seismic Research Of A Subway Station Based On The Time-procedure Analysis

With the rapid development of urbanization in our country, all kinds of underground structures have been being built up heavily in the city, and the seismic design and the safety evaluation of the underground structure has become an important topic. But for the earthquake response of underground structure, studies are still in the phase of exploration research both at home and abroad, even though its design has not yet been standardized. So the analysis of the subway stations, underground structure seismic problems has important theoretical significance and engineering application value.In this paper, taking a two layers of Shijiazhuang island type as the background, the subway station structure engineering simulations(two-dimensional standard section, open hole section calculation model and three-dimensional standard calculation model) are established by using a large finite element software ABAQUS. With time-history method, the stress and displacement of subway station structure under earthquake action are analyzed. The main content of this paper is as follows:(1)Through the analysis of the key issues in the dynamic analysis of numerical integration methods, damping model, material constitutive, boundary conditions, and seismic wave selection and input, the modeling conditions are determined, thereby the standard two-dimensional sections, two-dimensional calculation model open hole section and three-dimensional standard segment subway station are established.(2)Stress of the key components in the subway station structure model is computed by static analysis. The results show that under static force, and has a certain regularity of the stress distribution. Overall, the internal force of the ground floor is small, but the second floor underground is larger.(3)The results of paragraph two computing model(the standard two-dimensional and two-dimensional open-hole section) for dynamic analysis show that in the earthquake response, the internal forces and displacements of open hole section are larger than the standard segment. It can indicate that the open hole section of subway station structure is the weak section.(4) The response results of both two and three dimensional models show that the column and sidewall of the subway station are the weak components, and for the seismic design of structure, it should be paid sufficient attention to both column and sidewalls in order to improve members’ strength and ductility.