基于车桥耦合振动分析的大跨径曲弦桁梁桥加固方案评价研究

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (14) : 199-209.

论文

王艳1，刘哲1，周瑞娇1，陈淮1，赵志有2

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Evaluation of the reinforcement scheme for a long-span curved truss bridge based on vehicle-bridge coupled vibration analysis

WANG Yan1,LIU Zhe1,ZHOU Ruijiao1,CHEN Huai1,ZHAO Zhiyou2

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摘要

为评价在役曲弦桁梁桥加固方案，以122m跨径彩虹桥为工程背景，采用考虑跳车脱空时段的车桥耦合振动分析方法，进行在役曲弦桁梁桥及其加固方案的车桥耦合振动分析，通过计算加固前后桥梁的频率与振型、位移及冲击系数、振动加速度峰值、舒适性等动力性能指标来评价桥梁加固效果，并探讨各评价指标等的适用性。结果表明：桥梁加固方案的整体竖向和扭转刚度较原桥有明显提高，桥面竖向刚度显著提高；在汽车动力荷载作用下，桥梁加固方案的各动力响应、冲击系数和振动程度均有效降低，行人舒适性良好。容许加速度评价方法可以很好反映桥梁结构的振动程度，可用于桥梁加固方案动力性能评价；基于最大速度响应的振动感觉指标和基于加速度均方根的振级指标均能较好地评价桥梁舒适性评价；仅以冲击系数作为桥梁加固方案动力性能评价指标不合适。
关键词：曲弦桁梁桥；车桥耦合振动；动力性能；加固方案评价

Abstract

In order to evaluate the reinforcement scheme of the curved truss bridge in service, the Rainbow Bridge with span of 122m was taken as the engineering background, the vehicle-bridge coupled vibration analysis of the in-service curved truss bridge and its reinforcement scheme were carried out, based on the vehicle-bridge coupled vibration analysis method which can consider the period of vehicle jumping. The reinforcement effect of bridge were evaluated by calculating dynamic performance indexes of the bridge and the reinforcement scheme, including the frequency and mode shape, displacement and impact factors, the value of peak acceleration, comfortability and so on, and the evaluation indexs of applicability were also discussed. The results show that the integral vertical and torsional stiffness of the bridge reinforcement scheme is obviously higher than that of the original bridge, and the vertical stiffness of the bridge deck is significantly improved; the dynamic response, impact factors and vibration degree of the bridge reinforcement scheme are effectively reduced under the action of the vehicle dynamic loads , and there is a good comfortability for pedestrian; the evaluation method of allowable acceleration could well reflect the vibration degree of the bridge, and could be used to evaluate the dynamic performance of the reinforcement scheme of the bridge ; the index of vibration sense based on the maximum velocity response and the index of vibration level based on the root mean square of acceleration both could evaluate the bridge comfortability well; it is not appropriate to take the impact factor as the only evaluation index of dynamic performance of the reinforcement scheme.
Keywords: curved truss bridge; vehicle-bridge coupled vibration; dynamic performance; evaluation of reinforcement scheme

导出引用

王艳1，刘哲1，周瑞娇1，陈淮1，赵志有2. 基于车桥耦合振动分析的大跨径曲弦桁梁桥加固方案评价研究[J]. 振动与冲击, 2022, 41(14): 199-209

WANG Yan1,LIU Zhe1,ZHOU Ruijiao1,CHEN Huai1,ZHAO Zhiyou2. Evaluation of the reinforcement scheme for a long-span curved truss bridge based on vehicle-bridge coupled vibration analysis[J]. Journal of Vibration and Shock, 2022, 41(14): 199-209

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