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A framework for carrying out train safety evaluation and vibration analysis of a trussed-arch bridge subjected to vessel collision
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 Title & Authors
A framework for carrying out train safety evaluation and vibration analysis of a trussed-arch bridge subjected to vessel collision
Xia, Chaoyi; Zhang, Nan; Xia, He; Ma, Qin; Wu, Xuan;
Safety is the prime concern for a high-speed railway bridge, especially when it is subjected to a collision. In this paper, an analysis framework for the dynamic responses of train-bridge systems under collision load is established. A multi-body dynamics model is employed to represent the moving vehicle, the modal decomposition method is adopted to describe the bridge structure, and the time history of a collision load is used as the external load on the train-bridge system. A (180+216+180) m continuous steel trussed-arch bridge is considered as an illustrative case study. With the vessel collision acting on the pier, the displacements and accelerations at the pier-top and the mid-span of the bridge are calculated when a CRH2 high-speed train running through the bridge, and the influence of bridge vibration on the running safety indices of the train, including derailment factors, offload factors and lateral wheel/rail forces, are analyzed. The results demonstrate that under the vessel collision load, the dynamic responses of the bridge are greatly enlarged, threatening the running safety of high-speed train on the bridge, which is affected by both the collision intensity and the train speed.
trussed-arch bridge;vessel collision load;high-speed train;dynamic response;running safety evaluation;
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