Abstract
In order to investigate the vertical dynamic response characteristics of train-track-bridge system on CWR (Continunously Welded Rail) under dynamic load of train on HSR (High-Speed Railway) bridge. Based on the principle of vehicle train-track-bridge coupling dynamics, taking the 32m simply supported bridge of a section of Zhengzhou-Xuzhou Passenger Dedicated Line as an example, the finite element software ANSYS and the dynamic analysis software SIMPACK are used for co-simulation, and bridge model of the steel spring floating slab track and the CRTSIII ballastless track (China Railway Track System) considering the shock absorbing steel spring, the limit barricade and the contact characteristics of track structure layers are established. On this basis, in order to study the dynamic response laws of the design of ballastless track structure parameters to the system when the train crosses the bridge and provide the basis for the design and construction, by studying the influence of the speed of train on the bridge, the damage of fasteners and the parameters of track structure on the train-track-bridge system, the displacement of rail, vertical vibration acceleration and wheel-rail force response performance are analyzed. Studies have shown that: At the train speed of 40 km/h, the displacement and acceleration of the rail and track slab in the CRTSIII ballastless track are smaller than the floating slab track structure, but the floating slab track structure has better vibration reduction performance for bridges. The acceleration of rail, track slab and bridge increases obviously with the increase of train speed, the rail structure has the largest increasement. Reducing the stiffness of fasteners could decrease the vertical acceleration response of the steel spring floating slab track system, the ability to absorb shock can be enhanceed by reducing the stiffness of the fastener appropriately. Increasing the density of the floating slab can increase the vertical acceleration of the floating slab and the bridge, thereby decreasing the vibration amplitude of the system.
Highlights
In recent decades, the world railway ballastless track structure is mainly characterized by HSR (High-Speed Railway) in Germany and Japan
The CRTSIII ballastless track on the bridge adopts the unit block structure where there is an intermediate isolation layer between the baseplate and the selfcompacting concrete (SCC) layer, and using the limit barricade to transmit the longitudinal and lateral forces of the track [3]; As for the steel spring floating slab track, it floats the concrete slab with a certain quality and stiffness on the steel spring isolator, 30mm away from the top surface of the base cushion, which forms the mass-spring-foundation isolation system [4]
By comparing the dynamic response of the CRTSIII ballastless track structure and the steel spring floating slab track structure, it can be found that the vertical displacement of the rail structure of the floating slab track in Fig (a) is greater than that of the the III type track structure
Summary
The world railway ballastless track structure is mainly characterized by HSR (High-Speed Railway) in Germany and Japan. The BeijingShanghai HSR subgrade section is only 18.5%, and the rest of the lines are arranged on the bridges Such as the CRTSI double block ballastless track, the CRTSII longitudinal ballastless track, the CRTSIII ballastless track and the steel spring floating slab track [2]. In view of the special structure of CRTSIII ballastless track and steel spring floating slab track, the vibration mechanism and time-history characteristics of the train-track-bridge system are not very clear. Based on the method of ANSYS+SIMPACK co-simulation, the modal analysis is carried out to investigate the dynamic response of the system under the parameters of the structure itself, the fastener damage and the train speed, at the same time, the dynamic characteristics such as vertical displacement, vibration acceleration and wheel-rail force are discussed
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