某下承式拱桥车振动力性能分析

Dynamic Analysis of a Through Tied Arch Bridge under Moving Vehicle Loads

为研究下承式拱桥在移动车辆荷载作用下的动力性能,对某下承式拱桥建立三维有限元模型,并通过环境振动试验对该桥进行模态参数识别,以此验证有限元模型的可靠性。在不同车速荷载作用下对该桥梁的动力响应进行了对比分析,并在此基础上采用狄克曼舒适度评价指标对桥梁进行车振舒适度评价。结果表明:冲击系数的大小不仅和结构基频有关,还与车辆的行驶速度有关,车速越大冲击系数越大;桥梁的横向舒适性较好,竖向舒适性较差。

For further research on the dynamic performance of a through tied arch bridge subjected to excitation of moving vehicle loads, a three-dimensional finite element calculation model was established, and modal parameter identification of the arch rib under ambient excitation was carried out for a through tied arch bridge. The precision of calculation model was verified with measured results. The dynamic response of a through tied arch bridge subjected to excitation of moving vehicle loads was studied by finite element calculation model, comfort index of bridge was evaluated on this basis. The results show that the higher the vehicle speed and the higher impact coefficient, and horizontal comfortability of bridge was better while vertical one was poor.