Dynamic Response For Curve On Bridge Of Heavy Haul Railway Under Train Load

ABSTRACT:When heavy haul railway pass through the complex terrain area, to meet the requirements of line position control, a large of curves are set on the viaduct. The mechanical property of viaduct curves under the action of train is vital for circuit design. Dynamic response of the viaduct curves under the train load is analyzed by using the theoretical model. The range of influence of curve section under train dynamic action has been confirmed in the research. The main research results are as follows:(1) A relatively complete dynamic analysis model of viaduct curve location is established. The rail, sleeper, ballast bed and bridge vibration characteristics are taken into account in the model. The structural natural vibration of curve location is analyzed. And the model is verified by relevant test data.(2) Under the centrifugal force of curve, the lateral dynamic of viaduct curve location shows that:The number of marshaling has no effect on the amplitude and scope of lateral dynamic response in the viaduct curve location when it is greater than4carriages. The amplitude of lateral dynamic response increases with the speed, not as the scope. When the train passes through curves, the dynamic response which is caused by centrifugal force has an impact on the adjacent bridge span of the train operation position.(3) Under the axle load, the vertical dynamic of viaduct curve location shows that: The number of marshaling has no effect on the amplitude and scope of vertical dynamic response in the viaduct curve location when it is greater than3carriages. The amplitude of vertical dynamic response increases with the speed, not as the scope. When the train passes through curves, the dynamic response which is caused by axle load has an impact on the adjacent bridge span.