Influence of interface crack on dynamic characteristics of CRTS III slab ballastless track on bridge

Abstract

The damage of the self-compacting concrete in CRTS III slab ballastless track on bridge will lead to a partial void of the track slab, which will affect the comfort and safety of the train and the durability of the track slab and bridge structure. In order to study the impact of the interface crack on the dynamic response of CRTS I ballastless track system on bridge, based on the principle of multi-body dynamics theory and ANSYS+SIMPACK co-simulation, the spatial model of vehicle-track-bridge integration considering the longitudinal stiffness of supports, the track structure and interlayer contact characteristics were established. The dynamic characteristics of the system under different conditions of the width, length and position of the interface crack were analysed, and the limited values of the length and width of the cracks at the track slab edge were proposed. The results show that when the self-compacting concrete does not completely void along the transverse direction of the track slab, the crack has little effect on the dynamic characteristics of the vehicle -track-bridge system. However, when the self-compacting concrete is completely hollowed out along the transverse direction of the track slab, the dynamic amplitudes of the system increase. When the crack length is 1.6 m, the wheel load reduction rate reaches 0.769, which exceeds the limit value and threatens the safety of train operation. The vertical acceleration of the track slab increases by 250.1%, which affects the service life of the track system under the train speed of 200 km/h

Keywords

high-speed railway / railroad bridge / ballastless track / interface crack / dynamic characteristics / finite element

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