Study On The Seismic Risk Source Recognition And Practical Method Of Seismic Analysis For Metro Structures

With the large-scale construction of urban rail transit and the development andutilization of urban underground space, the number of the subway were graduallyincreased, which led to the form of combination and structure of subway are more andmore complex. At the same time, the subway stations, the important part of animportant part, are to provide convenient services for the travel of people, for thesefunctional characteristics, as that the subway line network and undergroundengineering is often planned decorated along the city’s downtown district, the variousfunctional areas and the living of residents. so that can inevitably lead to catastrophicdamage once earthquake. This would bring problem to the city, and put forwardhigher requirements for the seismic performance of underground structures.Paper relies on the National Natural Science Foundation large-scale closelyunderground structures of subway earthquake disaster research of considering seismicsurface wave effect in basin (41272337), the long tunnel earthquake responsemechanism and seismic (51038009) Beijing Natural Science Foundation: Study onseismic response of three-dimensional intersected underground subway structures andits seismic design method(8111001).Based on the geology, the characteristics ofground motion, and the typical complex structures form of subway station in Beijing,Studying the practical method of subway station seismic risk source identification andseismic analysis. The principal study contents and result are as follows:1、Basing on the environmental risk sources grading the complex structure of thesubway station commenced earthquake response of scholars at home and abroad,,clear and definite the subway station structure seismic risk source identification.2、Proposed the FLAC-SAP combination of the seismic analysis and practicalmethod that using FLAC on dynamic time-history analysis and calculation subwaystation structure displacement and deformation. Then the displacement deformationwill be applied to the structure node to calculate the action of internal forces underseismic conditions in SAP84.3、Seismic risk source identification and seismic safety evaluation for subwaystation’s main body, tunnel and subsidiary structure of the Beijing subway line16.(1)Comparative analysis the impact of the structural deformation of theTangshan earthquake-Beijing hotels measuring points north-south direction earthquake dynamic time course and Suzhouqiao station for50years beyond a10%probability of ground motion (3lines).(2)Relying on the Xiajiahutong station project, study the deformation of thesubway station in layered soil with earthquake by numerical simulation.(3)Input peak acceleration of0.2g Tangshan earthquake-Beijing hostels wavecase in bedrock, calculate the peak relative horizontal displacement and internalforces of structural key parts, and then determine the seismic design of key positions.(4)On the basis of the subway station earthquake risk source identification,using FLAC-SAP combination method for the type of different complex structuralmodel to seismic safety evaluation, prove that this method has good adaptability, andalso provide a new way of thinking for engineering seismic design.