考虑车辆过缝的车-桥耦合振动分析方法

Vehicle-bridge coupling vibration analysis method considering vehicle passing expansion joint

为考虑伸缩缝参数变化对车-桥耦合动力响应的影响,通过分析车轮过缝过程,提出了车辆过缝等效力、等效位移模型.利用伸缩缝局部振动模态提取法及模态综合法,建立了考虑伸缩缝参数影响的车-桥耦合动力响应分析模型,并基于Matlab平台编制了车辆过缝的车-桥耦合动力响应分析程序及其数值求解方法.以某简支转连续梁桥为例,通过现场实测对考虑车辆过缝的车-桥耦合动力响应分析方法进行验证.结果表明,利用所提方法计算的伸缩缝和主梁的加速度和位移响应峰值与实测值的误差均在7%以内,说明该方法能够较为准确地考虑车辆过缝对车-桥耦合动力响应的影响.

To consider the influence of expansion joint parameters on the vehicle-bridge coupling dynamic response, the equivalent contact force and displacement models were proposed by analyzing the process of wheel passing through the joint. The vehicle-bridge coupling dynamic response analysis model considering the impact of expansion joint parameters was established by the local mode extraction method and the modal synthesis method. Based on the Matlab platform, the analysis procedure of vehicle-bridge coupling vibration considering vehicle passing expansion joint and the numerical calculation method were constructed. The vehicle-bridge coupling dynamic response analysis method considering the expansion joint parameters was verified by the field-testing results of a simple-supported-to-continuous girder bridge. The results show that the errors between the numerical results and the field-testing results of the peak values of the acceleration and displacement response of the expansion joints and the main beam are within 7%, indicating that the proposed analysis method can be used to analyze the vehicle-bridge coupling dynamic response considering the impact of expansion joint parameters.