Research On Vibration Serviceability And Vibration Reduction Optimization Of Train-Bridge Elevated Station

In recent years,China’s urban rail transit viaduct has developed rapidly,with an increasing number of viaduct stations and a gradual shortage of urban land.The "bridge construction integration" viaduct station came into being."Bridge construction integration" type elevated station refers to the elevated bridge that needs independent land occupation and becomes a part of the elevated station through common piers.Although the "bridge construction integration" elevated station can improve traffic and facilitate passengers’ transfer,the vibration caused by train operation will be directly transmitted to the interior of the elevated station through the track beam,which has the hidden danger of excessive vibration caused by vehicles in the elevated station.The structural forms of elevated stations are generally divided into "separation of bridge construction" and "integration of bridge construction".Because the station is separated from the viaduct,there are many ground columns and occupy a large space,which will affect the spatial layout of the station.The bridge structure and the station structure of the "bridge construction integration" elevated station are coupled with each other to form a space frame structure.The space frame structure is not only the structural body of the station structure,but also the support body of the bridge structure.There are few ground columns,which is convenient for commercial development.The structural form of "bridge construction integration" elevated station plays an important role in improving traffic pressure and saving urban land,but the vibration serviceability caused by train operation seriously limits the development of this structural form.The vibration excited by the "bridge construction integration" elevated station during train operation is directly transmitted to the frame beam and column through the track beam,which causes excessive vibration of the target floor,affects the physical and mental health and working mood of passengers and staff in the station,and leads to the problem of vibration serviceability.In view of the above problems,taking a typical "bridge construction integration" elevated station as the engineering background,this paper studies the vibration propagation law of "bridge construction integration" elevated station through the combination of field measurement and numerical simulation,and optimizes the vibration reduction of "bridge construction integration" elevated station on this basis.The main work is as follows:(1)This paper discusses the development of train bridge coupling vibration research at home and abroad,the general situation of vibration response analysis and research of elevated station,points out the shortcomings of existing research,and expounds the necessity of vehicle induced vibration response research of "bridge construction in one" elevated station under train load.(2)Establish the train station coupling vibration analysis model,calculate the vibration response of station structure under train load,and study the vehicle induced vibration propagation law of "bridge construction in one" elevated station,so as to prepare for the vibration reduction optimization of "bridge construction in one" elevated station in the next step.(3)Based on the train station coupling vibration analysis model,a parametric finite element model of "bridge construction in one" elevated station is established to study the vibration reduction effect of elevated station from three directions: vibration source,vibration propagation path and vibration subject.(4)Based on the existing train station coupling vibration analysis model,the track model and spring damping element are added to establish the train track station structure coupling vibration analysis model,and the influence law of track parameters on the floor vibration of station hall floor is studied.