| With the urbanization process in China,urban land resources are increasingly scarce,the utilization of urban underground space has become a trend.As a means of solving urban traffic,the subway has become a major component of the current urban underground space utilization.As a country with many earthquakes,China’s Tangshan shan earthquake and Wenchuan earthquake have suffered huge losses,so the seismic research of subway stations needs to be deepened.Metro stations are usually buried under the city roads,and there must be a situation in which the municipal bridges overlap in space.In such a circumstance,the seismic calculation needs to consider the interaction between the station and the structure.This paper takes "Xiamen Rail Transit Line 2 Overlying Bridge Wuyuanwan Transfer Station" as the research object,and uses ANSYS finite element software to establish a three-dimensional numerical model of soil-station-piercary pier.The linear model uses soil dynamic equivalent linear constitutive model and is based on the equivalent uniform viscoelastic boundary condition.The dynamic history response method is used to analyze the single-column and double-span station structure,the double-column three-span station structure and the transfer node respectively.A comparative study was conducted with basic combinations and standard combinations.Through the system analysis,the dynamic characteristics of the bridge pier and the station construction are understand.It is proposed that the pier bearing platform affects the station mainly within where it is in the longitudinal span of the station;the pier cap must span the entire cross section of the station which would for structural stress;the cross section of the station should be strengthened as a whole,and the tension transmission measures should be set for the side wall;the structural weak link of the transfer node is the junction between the node and the outer structure.It is recommended to consider the connection part,irregular members and irregular longitudinal beams according to the two-way plate;in irregular part of the station,seismic condition is the control condition;the middle column is a two-way force member under seismic conditions,and the circular section is reasonable.,using a rectangular section,should limit its aspect ratio.The research results provide technical support for the design of the Wuyuanwan transfer station on the No.2 line of Xiamen Rail Transit. |
