Dynamic Response Analysis Of Pier Settlement To Traffic

The displacement of piers will cause rail deformation and have a great impact on the driving safety and comfort of high-speed vehicles.In order to make clear the action law of bridge pier settlement to vehicle dynamic response and ensure the safety of high-speed railway operation,The main work of this paper is as follows:(1)the model of dynamic response of pier displacement to driving is established.On the basis of a large number of domestic bridge pier settlement cases and analysis methods,combined with finite element theory,multi-body dynamics,rigid-flexible coupling theory and so on,computer simulation method is adopted.The static analysis model of rail-ballastless track-bridge and the rigid-fiexible coupling dynamic analysis model of vehicle-line-bridge are established.(2)the action mechanism of pier displacement on rail deformation is analyzed.The mapping relationship between pier displacement and rail deformation is analyzed by applying a given forced displacement load to the pier.The deformation of rail decreases rapidly when it is far from the main settlement pier,and the upper arch occurs at the adjacent undisplaced pier.The greater the displacement of the pier,the greater the rail displacement in the main settlement zone,and the larger the deformation of the rail arch at the beam joint.(3)The dynamic response of vehicle in displacement section of pier is analyzed.The obtained rail deformation curve is used as the excitation input of the wheel-rail system in the rigid-flexible coupling dynamic model of the vehicle-line-bridge,and the dynamic characteristics of the displacement section of the high-speed train passing through the bridge pier under different driving speeds are analyzed.The settlement of bridge pier has significant influence on the vertical acceleration of car body.The transverse displacement of bridge pier has significant influence on the transverse acceleration of car body.The acceleration of car body increases with the increase of vehicle speed.The research results can provide a theoretical basis for guiding the maintenance of high-speed railway.