极端制动车载下悬索桥伸缩缝服役状态评估

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (15) : 186-195.

论文

极端制动车载下悬索桥伸缩缝服役状态评估

李光玲1，韩万水2，张路3，张煜敏1

作者信息 +

Service state evaluation for expansion joints of suspension bridge under extreme vehicle braking load

LI Guangling1, HAN Wanshui2, ZHANG Lu3, ZHANG Yumin1

Author information +

文章历史 +

摘要

为评估运营阶段极端制动车载作用下悬索桥伸缩缝的服役状态，基于已有车-桥耦合振动分析系统，引入车辆制动力和俯仰力矩建立可考虑车辆制动过程的分析系统，并进行荷载试验验证；联合监测交通流数据与变参数速度-密度关系模型，推导了与监测车道数据匹配的速度-密度模型，确定不同车流密度状态下的车流交通量及车速取值；采用融合交通流及车辆特性并考虑变量相关的车流模拟方法，考虑驾驶员反应时间及拥堵流模型实现了极端制动车流的高真实度仿真；以伸缩缝工作极限状态为准则明确了对应的工作域及失效域状态；以一悬索桥为算例，评估了不制动、单车道制动及双车道制动车载下悬索桥伸缩缝服役状态。分析结果表明：验证后的分析系统可为极端车流制动车载下伸缩缝服役状态的评估提供数值分析平台；不同环境温度取值下悬索桥伸缩缝的正常工作域存在差异性；相对不制动及单车道制动工况，双车道发生制动且对向车道正常运营时，纵向位移响应极值的均值最大，为416.25mm，未超过设计范围-640mm~700mm；单车道及双车道制动工况下伸缩缝绕竖向轴角度极值的均值分别为0.075rad、0.082rad，均超过设计范围0.0557rad，极易造成伸缩缝发生一端拉裂或一端挤死现象；建议设计过程中考虑极端制动工况以确保梁端伸缩缝变形量的工作储备，且当发生车道制动状况时，应立即控制对向车道的车辆驶入桥梁范围直至交通事故状态解除。
关键词：桥梁工程；悬索桥；伸缩缝；纵向位移；绕竖向轴转角；服役状态评估

Abstract

To evaluate the service state of expansion joints of suspension bridge under extreme vehicle braking loads at operation stage, based on the existing vehicle-bridge coupling vibration analysis system, the braking force and pitching moment of the vehicle were introduced to establish analysis system considering the process of vehicle braking, which was verified by load test. Combining monitored traffic flow data with variable parameter speed-density relationship model, the speed-density model matched with lane monitored data was derived, and the traffic volume and speed values could be determined under different traffic flow density states. A stochastic traffic flow simulation method combing traffic flow and vehicle characteristics considering variable correlation was simulated. The extreme traffic flow braking model was high fidelity modeled considering driver response time and congestion flow model. The working limit state of expansion joints was taken as the criterion, and the corresponding working region and failure region could be defined. Taking a suspension bridge an an calculation example, service state of expansion joints of suspension bridge were evaluated under scenarios with non-braking, single-lane braking and double-lane braking vehicle loads. The results indicated that the established analysis system could provide a numerical analysis platform for service state evaluation of expansion joints under extreme braking vehicle loads. Compared with non-braking and single-lane braking scenarios, the mean of extreme values of longitudinal deformation under double-lane braking with normally operation on the opposite lane reached the maximum, and was 416.25mm, which was far less than the designed allowance -640-770mm. The mean of extreme values of angle around the vertical axis under singe-lane braking and double-lane braking scenarios were 0.075rad, 0.082rad, which were over the designed allowance -0.0557rad-0.0557rad, causing that expansion joints was prone to over tension at one end or compression at the other end It was suggested that the extreme braking vehicle loads should be considered in the design process to ensure the work reserve of the deformation of expansion joints. In addition, when the lane braking condition occured, the vehicles in the opposite lane should be not allowed to enter the bridge range immediately until the traffic accident state was relieved.
Key words: bridge engineering; suspension bridge, expansion joints; longitudinal deformation; angle around the vertical axis; service state evalution

导出引用

李光玲1，韩万水2，张路3，张煜敏1. 极端制动车载下悬索桥伸缩缝服役状态评估[J]. 振动与冲击, 2022, 41(15): 186-195

LI Guangling1, HAN Wanshui2, ZHANG Lu3, ZHANG Yumin1. Service state evaluation for expansion joints of suspension bridge under extreme vehicle braking load[J]. Journal of Vibration and Shock, 2022, 41(15): 186-195

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