首先介绍了桥上轨道结构的减振及隔振垫层原理,然后利用ansys建立在移动荷载作用下桥上轨道结构振动模型,并以外部激励的形式输入轨道不平顺。然后分析了有碴轨道结构在混凝土桥梁上的竖向动力特性,研究不同隔振垫层及参数的情况下,轨道结构的动力响应和加速度频谱,最后对桥上轨道结构的减振设计提出了建议。 Firstly, the principle of vibration reduction and vibration isolation cushion on the bridge track structure is introduced. Then the vibration model of bridge track structure under the action of moving load is established by ansys, and the track irregularity is input by external excitation. Then, the vertical dynamic characteristics of ballasted track structure on concrete bridge are analyzed. The dynamic response and acceleration spectrum of track structure are studied under different conditions of cushion and parameters. Finally, some suggestions are put forward to reduce the vibration of track structure .