Space Dynamics Analysis Of High-speed Train-Floating Slab Track-Viaduct Coupling System

High-speed railway of our country is mainly based on the bridge as a bearing structure,the vibration of the bridge structure has gradually been taken seriously.Steel spring floating slab track can effectively reduce the upper train load on the bridge vibration effects as an efficient vibration isolation track structure.Currently,the study of steel spring floating slab track structure,which are based on urban rail transportation mostly.But the study of vibration reduction performance for high speed railway spring floating slab track structure research is still blank on the elevated line.In order to learn more about the vibration characteristics of steel spring floating slab track on high speed railway bridge and its influence on the vibration of the bridge,this article established a complete relatively space coupling dynamics analysis model of high-speed train-track-bridge through the software of finite element analysis(ANSYS).From vibration transmissibility of floating slab track structure,vibration responses comparison of floating slab track and common slab track,and vibration response of the whole system,this paper analyses the vibration characteristics of steel spring floating slab track structure,and researchs vibration response of the whole system in different track structure parameters and speeds.The details are as follows:(1)With harmonic analysis of steel spring floating slab track-bridge system by changing different orbit structural parameters,and then study the vibration transmission characteristics of the steel spring floating slab track-bridge system.Research suggests that steel spring stiffness,spring spacing and the density of floating slab have great important effect on vibration transfer characteristics of the system,which should be the major consideration.But the changing of fastener rigidity has little effect on vibration transfer characteristics of the system.(2)Through comparative dynamic simulation analysis of the steel spring floating slab track and the common slab track,the research shows that the steel spring floating slab track can reduce the vibration response of the bridge greatly and the effect of high frequency vibration on bridge effectively.The results show that the steel spring floating slab track structure has better vibration isolation effect than common slab track.(3)Through transient dynamics analysis of high speed train-steel spring floating slab track-bridge coupling system,the influence of the structural characteristics of steel spring floating slab track on the vibration characteristics of each component is studied.The research shows that steel spring stiffness,spring spacing,the density of floating slab and fastener rigidity have great important effect on vibration response of the system.But the changing of train speed has little effect on vibration of the train and bridge structure.In this article,based on the simulation analysis of steel spring floating slab track on high speed railway bridge,the vibration regularity of the system is determined,which provide the relevant theoretical basis for the application of steel spring floating slab track in the high-speed railway bridge...