DYNAMIC ANALYSIS OF BALLASTED-BALLASTLESS TRACK TRANSITION SECTION ON HIGH SPEED RAILWAY BRIDGE

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (9) : 76-81.

Based on the project of transition section between ballasted track and CRTS II ballastless track on super large bridge of Beijing-Shanghai high-speed railway, the finite element model of vehicle-track coupling dynamics is established, and the influence of different structural measures on dynamic characteristics of the transition section are studied. The results show that overall stiffness of the ballasted track is greater than ballastless track when the under-rail pads stiffness of ballast track is 55~75MN/m and that of ballastless track is 20~30MN/m. The overall stiffness of ballasted and ballastless track are roughly identical when the rail pad stiffness of ballasted track is 55~75MN/m while that of ballastless track is 40~50MN/m. Transition sleeper and wide sleeper is unsuitable to be used in the transition section when ballast track stiffness is greater than ballastless track. The ballast glue improves the integrity of ballast bed and the stability of track structure in transition section but it also increases the track stiffness. In order to reduce the wheel-rail forces caused by the increased track stiffness, the rail pad stiffness has to be decreased. The auxiliary rails enhance the stability of track structure but it has little impact on the track stiffness.

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Abstract

Based on the project of transition section between ballasted track and CRTS II ballastless track on super large bridge of Beijing-Shanghai high-speed railway, the finite element model of vehicle-track coupling dynamics is established, and the influence of different structural measures on dynamic characteristics of the transition section are studied. The results show that overall stiffness of the ballasted track is greater than ballastless track when the under-rail pads stiffness of ballast track is 55~75MN/m and that of ballastless track is 20~30MN/m. The overall stiffness of ballasted and ballastless track are roughly identical when the rail pad stiffness of ballasted track is 55~75MN/m while that of ballastless track is 40~50MN/m. Transition sleeper and wide sleeper is unsuitable to be used in the transition section when ballast track stiffness is greater than ballastless track. The ballast glue improves the integrity of ballast bed and the stability of track structure in transition section but it also increases the track stiffness. In order to reduce the wheel-rail forces caused by the increased track stiffness, the rail pad stiffness has to be decreased. The auxiliary rails enhance the stability of track structure but it has little impact on the track stiffness.

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transition section / ballastless track / ballasted track / dynamic response

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LIU Yu，Zhao Guo-tang，QI Wei，CHEN Pan . DYNAMIC ANALYSIS OF BALLASTED-BALLASTLESS TRACK TRANSITION SECTION ON HIGH SPEED RAILWAY BRIDGE[J]. Journal of Vibration and Shock, 2015, 34(9): 76-81

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