新西海桥的振动特性及舒适性评价研究

以日本首座公路钢管混凝土拱桥——新西海桥为对象,进行该桥的自由振动特性分析,采用考虑路面不平整的桥梁与车辆相互作用力学模型,分析了在移动车辆作用下该桥的动力特性,包括冲击系数和舒适度评价。研究结果表明,在移动车辆作用下钢管混凝土拱桥主跨的拱肋和桥面冲击系数都较小,钢管混凝土拱肋的振动小于主桥桥面的振动。从振动舒适性的观点看,采用纵横梁格构桥道体系的新西海桥在车辆荷载作用下拱肋、桥面和人行桥均满足舒适性要求,具有较好的行车性能。

Vehicle-bridge Dynamic Analysis and Riding Comfort Evaluation of New Saikai Bridge

The natural vibration properties of New Saikai Bridge,the first highway concrete-filled steel tubular arch bridge in Japan,were discussed.Using the bridge-vehicle interaction model considering road roughness,the properties of the vehicle-bridge vibration were investigated,including the impact factor and the riding comfort evaluation.It is shown that,the impact factors of the concrete-filled steel tubular arch rib and the deck at main span are small,and the vibration of the concrete-filled steel tubular arch rib is smaller than that of the deck at main span.Lattice deck system with longitudinal girders and horizontal beams in New Sakai Bridge is shown to be a good choice with regard to vibration riding comfort,considering the satisfaction of riding comfort for arch rib,deck and pedestrian bridge.