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Structural Engineering and Mechanics Volume 59, Number 4, August25 2016 , pages 683-701 DOI: https://doi.org/10.12989/sem.2016.59.4.683 |
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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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Chaoyi Xia, Nan Zhang, He Xia, Qin Ma and Xuan Wu
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| Abstract | ||
| 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 trussedarch 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. | ||
| Key Words | ||
| trussed-arch bridge; vessel collision load; high-speed train; dynamic response; running safety evaluation | ||
| Address | ||
| Chaoyi Xia, Nan Zhang and He Xia: School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China; Beijing Key Laboratory of Track Engineering, Beijing 100044, China Qin Ma: CCCC Highway Consultants Co., Ltd., Beijing 100088, China Xuan Wu: School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China | ||