基于车桥耦合的钢管混凝土拱桥车桥冲击系数研究
Research on the impact coefficientof the concrete filled steel tube arch bridge based on the vehicle-bridge coupled vibration

以某钢管混凝土拱桥为研究对象,利用ANSYS软件建立了该桥的三维有限元模型,然后基于两轴车辆模型作用下的车-桥耦合振动模型,自编车桥耦合振动程序从路面粗糙度、行车速度、行车数量和行车间距4个方面对钢管混凝土拱桥的动力响应和冲击系数进行分析,计算结果表明:路面粗糙度、车辆行驶速度、车辆数量以及车辆间距对桥梁冲击系数均有一定程度的影响,所得出的结论可为钢管混凝土拱桥设计及后期养护提供参考。
The three-dimensional finite element model of CFST arch bridge based on the software ANSYS was built and the dynamic characteristics of the structure were analyzed. Based on the vehicle-bridge coupled vibration model under the action of the two axle vehicle model, the self-made program for the vehicle-bridge coupled vibration analysiswas applied to calculate and analyze the effect of moving vehicles on the dynamic response of the CFST arch bridge considering the different the pavement roughness, different driving speed, different vehicle numbers and different driving distance of vehicle. Then, the impact coefficient of CFST arch bridge was calculated based on the vehicle-bridge coupled vibration. The research results show that the pavement roughness, driving speed of vehicle, the number of vehicles and the driving distance of vehicles have some effect on the impact coefficient of the CFST arch bridge. The conclusion obtained can provide a reference for the impact coefficient evaluation of CFST arch bridges at the design stage and the determining load effect for the bridge maintenance at the service stage