Research On Evaluation Methodology Of Three Dimensional Seismic Performance Of Fabricated Subway Station Structure Connected By Sleeve

Fabricated subway station structure has been an effective way to solve problems in design and construction of subway, so it has been an important trend for the development of subway station structure in the future. However, researches existed are mainly concentrated on the traditional monolithic structure which is relative simple and it's uncommon to find the researches on the fabricated subway station structure. Based on the project example of Jin'anqiao fabricated subway station, we get the regularity understandings using numerical method about seismic performance of fabricated subway station under the horizontal seismic loading, the vertical seismic single loading and the coupling. And the results was analyzed comparing with the correspondent monolithic structure. In addition, considering the insufficiency of vertical stiffness of Jin'anqiao common fabricated subway station structure, the author suggested that the middle columns of structure could been replaced to the concrete-filled steel-tubular column. And seismic performance of the new scheme was verified by simulating. Now the new scheme has been adopted. The main work and achievement of this thesis are as follows:(1) Based on the results of full-scale pseudo static test about the side walls of the fabricated subway station connected by grouting sleeves, the equivalent mechanical model of joint zone was established. The finite-element simulation of the model indicates that the model can rationally describe deformation performance of the joints under cyclical loading and numeric parameters are set appropriately. A three-dimensional explicit nonlinear finite element model to analyze the seismic response of the system of underground structure and surrounding soil was established and the method of simulating of the joint zone, the processing methods for the boundary condition, the input of ground motion and the nonlinear contact between the structure and soil were given. Furthermore, the constitutive model parameters of the materials and the determination method were also introduced.(2) When the subway station is subject to the horizontal seismic single loading, the vertical seismic single loading and the coupling loading of horizontal and vertical seismic, the seismic response of Jin'anqiao fabricated subway station structure. The results show that the horizontal seismic performance of Jin'anqiao subway station is relatively strong under the horizontal or vertical seismic single loading. And the horizontal seismic response is the most strongest in the peak acceleration time. That is to say, in the elastic deformation range, the seismic response of structure depends on the peak load; The vertical seismic performance of the structure is relatively weaker. The middle columns of the structure have been deformed relatively largeThe horizontal seismic performance of Jin'anqiao subway station decreases slightly under the coupling loading of horizontal and vertical seismic and the elastic-plastic deformation has been occurred. The dynamic response increases by the time lasting of seismic loading; And the vertical seismic performance of the structure is relatively weaker as well which means the vertical stiffness of the Jin'anqiao common fabricated subway station structure is insufficient.(3) The vertical and horizontal seismic performance of fabricated subway station was analyzed quantitatively by using failure index(FI) and story drifts. The numerical simulation results indicate that the seismic behavior of fabricated structure has a measurable reduction comparing with the cast-in-situ structure. In the horizontal direction, the story drift of fabricated structure has a 10%-15% increase over the cast-in-situ structure at the moment of peak acceleration. In the vertical direction, the FI of fabricated structure is larger than which of the cast-in-situ structure at the moment of peak acceleration, and the increasing magnitude of upper layer is about 5%-10% while the under layer's is approaching to 20%-30%.(4) A three-dimensional finite element analysis model of the new Jin'anqiao subway station whose middle columns are using concrete filled steel tube is established. Based on this model, dynamic response of the new structure under the horizontal?vertical and couple earthquake action is analyzed by simulating. Comparing with the correspondent old scheme, we find that the vertical stiffness of the structure has been strengthen greatly and the seismic performance of Jin'anqiao subway station is improved by using concrete-filled steel-tubular columns.