吊索断裂状态下公铁两用悬索桥及桥上列车动力响应研究

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摘要为研究大跨度公铁两用悬索桥在列车作用时吊索断裂状态下的动力响应，开发针对柔性结构断索分析的非线性有限元动力算法并验证了算法的合理性。以实际大跨度公铁两用悬索桥为研究对象建立了全桥3维计算模型，计算吊索突然断裂时全桥结构的动力响应；研究在列车-桥梁耦合动力作用下，不同突然断索工况发生时，桥梁结构与桥上行驶列车的动力响应。研究结果表明：大跨度公铁两用悬索桥通常具有较大安全冗余，跨中位置单侧3根以下吊索断裂造成的冲击荷载对桥梁结构的安全性影响较小；列车在桥上行驶时，若发生突然发生单根吊索断裂，会导致列车竖向加速度响应发生明显变化，但加速度值在安全范围内；单根吊索断裂后，桥梁可保持列车通行。研究结果可为分析与评估公铁两用悬索桥断索影响提供理论指导。

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	王涛
	王路
	张兴标
	刘德贵

关键词 ：桥梁工程, 悬索桥, 吊索断裂, 有限元方法, 动力响应

Abstract：In order to investigate the dynamic response of long-span road-rail suspension bridge under the action of train in case of suspender fracture, a nonlinear finite element dynamic algorithm for cable fracture analysis of flexible structure was developed, and the rationality of the algorithm was verified. A real long-span road-rail suspension was taken as the research object, and a 3 D calculation model of the whole bridge was established. The dynamic response of the whole bridge structure when the suspenders suddenly fracture was calculated. The dynamic response of the bridge structure and the train on the bridge was studied under different conditions of suspender fracture under train-bridge coupled dynamic action. The results show that long-span road-rail suspension bridge usually have large safety redundancy, and the impact load caused by the fracture of less than 3 suspenders on one side of the middle span of the suspension bridge has little influence on the safety of the bridge structure. When the train is running on the bridge, the vertical acceleration response of the train will change obviously if the cable fracture suddenly, but the acceleration is within the safe range. The fracture of a single suspender has little effect on the stiffness of the bridge structure, and the train can be kept running on the bridge. The results can provide theoretical guidance for the analysis and evaluation of the impact of suspender fracture on the road-rail suspension bridges.

Key words： Bridge engineering Suspension bridge; Suspender fraction Finite element method Dynamic response

收稿日期: 2023-03-06 出版日期: 2023-11-28

引用本文:

王涛，王路，张兴标，刘德贵. 吊索断裂状态下公铁两用悬索桥及桥上列车动力响应研究[J]. 振动与冲击, 2023, 42(22): 273-282.
WANG Tao, WANG Lu, ZHANG Xingbiao, LIU Degui. Investigation on the dynamic responses of a road-rail suspension bridge and the trains on bridge in case of suspender fracture. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(22): 273-282.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I22/273

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