Study On The Damping Control Of Station-Bridge Structure Based On Viscous Dampers

In recent years,with the development of China's economic and technology,urban rail transit system has been gradually improved.Along with the extension of rail transit to the suburbs,the rail transit construction in all major cities shows a trend of elevated lines,and the form of elevated metro stations also arises at the historic moment.As an important building whose seismic fortification is class B,the seismic performance of subway station should be paid attention to.Considering many factors such as safety and economy,the research on the design of elevated metro stations is a choice which can both meet the structural performance requirements and reduce the cost.The viscous damper and its application in the construction of the station-bridge structure belong to the research and application of the energy dissipation in passive control.The form of station-bridge structure is one of the better overall performance structure forms of elevated metro station.But at present,the research on the application of viscous dampers to the station-bridge structure is still in the initial stage.In this paper,seismic analysis of the Guzhenkou South Station which is a station-bridge structure is analyzed under the condition of uncontrolled and controlled,and the parameters of the viscous dampers are optimized,the details are as follows:(1)First of all,this paper introduces the structures and the development of Metro elevated station,briefly summarizes the current research and application of energy dissipation structure,and expounds the background,significance and content of this research.(2)The engineering general situation of Guzhenkou South Station in Qingdao is introduced.The finite element model of station-bridge structure based on MIDAS GEN is established,and the dynamic characteristics of the structure are analyzed.According to the requirements of the performance level at home and abroad and the development of the plastic hinge in the structure,the performance level which needs to be met is put forward,and the seismic analysis of the structure is carried out based on the performance.(3)The structure and mechanical model of viscous dampers are briefly introduced,and the design scheme of shock absorption of the station-bridge structure is also discussed.Theparameters of viscous dampers are analyzed and optimized,so that the range of damper parameters which can effectively reduce earthquake response and the extent of the damping effect of changed damper parameters are obtained.The installation location of viscous dampers is also optimized,and where the viscous dampers can perform best has been obtained.The research results show that viscous dampers have obvious damping effect on Guzhenkou South Station.After the other parameters(the parameter and quantity of viscous dampers)are determined,it is most reasonable to arrange the dampers symmetrically at the maximum response of the uncontrolled structure(the structure without dampers).