Analysis Of Dynamic Interaction Between Complex Metro Station And Adjacent Structure Under Seismic Excitation Based On 3D Model

Due to China's economic development and increasing ground traffic,many cities begin to build the subway.Subway station seismic problem has caught the attention of more and more engineering and technical personnel.Most of the previous two-dimensional slice plane model has been unable to meet the requirements of seimic design under the condition of increasing complicated underground structure.Large-scale three-dimensional fine calculation model is imperative.For large cross-section changes,complex large underground space structure,the use of three-dimensional model to simulate,which is more close to the real situation.With the increasingly crowded underground space,subway stations are often adjacent to other structures.The dynamic interaction between them will significantly change their dynamic response characteristics.At present,there are very few studies on the dynamic response of subway stations to adjacent structures.Therefore,it is of great theoretical and engineering value to study the seismic problem of complex subway station hub and its adjoining structures.In this paper,the Shenzhen MTR CheGongmiao Station is the engineering background and three-dimensional viscoelastic artificial boundary,centralized mass finite element method were used.The model takes into account the fine structure of the station stringer,the beam,the roof opening,the middle plate opening and so on.In this paper,the innovation in the model cited aviation skin technology and stiffener technology.The article builds the structure model of station 7-9 and viaduct,Line 11 and Line 1 Station Joint Structure Model and 7-9 station and property construction joint structure analysis model.And then the dynamic time history analysis and calculation of the model is done.Then the dynamic response of the station structure and adjacent structures under the action of horizontal seismic force is obtained.Through the analysis and the comparison of the results,we found that:In the earthquake,the longitudinal stifness of the subway station is greater than the station lateral stiffness.Therefore,the main control of the station is the seismic wave lateral vibration input.In the seismic design should focus on strengthening the station's lateral stiffness,which can effectively reduce the station deformation and column internal force values.Adjacent property complex can effectively increase the lateral stiffness of the station,making the station deformation and column internal force reduction.When the horizontal seismic wave along the station transverse vibration input,the shear value and bending moment value of station post in the middle of the station column and roof connection are largest.The station post here should be designed as a control section of the station stand.In the plate escalator exposed bare beam is also in the earthquake-resistant parts,should be cause for concern.When the seismic wave propagates up from the bedrock to the hard rock and soft soil interface,the acceleration peak changes,which increases dramatically.The location of the underground continuous wall structure should be the focus of its seismic design.