In China,many cities have adopted linear induction motor(LIM) rail transit system, but a specialized code of urban railway transportation has not yet been established. In this paper, the dynamic factor formulations of railway bridge in the world are introduced. Taking a typical bridge in Guangzhou metro Line 4 as the engineering background,this paper conducts the theoretical and experimental analyses for vehicle-bridge coupling vibration, and obtains the theoretical and experimental values of dynamic factors by using the random vibration theory. Through theoretical and experimental analyses for vehicle-bridge coupling vibration, a reasonable formula for the dynamic factor is proposed, which can provide a reference for the design of bridges in urban mass transit.%国内很多城市建立了城市轨道交通系统,但是针对城市轨道交通桥梁的专门规范还没有建立.总结了国内外既有铁路桥规中各国桥梁的车辆竖向荷载的动力系数计算公式.结合广州地铁4号线高架桥梁,运用随机振动理论,对车桥耦合振动计算和现场动力试验结果进行处理,获得在直线电机列车作用下城市轨道交通桥梁的动力系数理论值及实测值.根据理论及实测结果分析了直线电机作用下轨道交通桥梁动力系数的合理取值,为城市轨道交通高架桥梁的设计提供参考依据.
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