该文以刚体动力学方法建立车辆子系统模型,以有限元法建立桥梁子系统模型,假定轮对运动为钢轨运动、轨道不平顺、轮对蛇形波三者的代数和,研究了车桥耦合系统的求解方法及响应的特性。以秦沈客运专线狗河特大桥跨度24m预应力混凝土简支梁作为算例,采用滤波方法分析了桥梁的位移响应、加速度响应的频谱成份,并讨论了桥梁响应对轨道不平顺幅值、蛇行波幅值、蛇行波波长等参数的敏感性。 In this paper, the vehicle subsystem model is established by the method of rigid body dynamics and the bridge subsystem model is established by the finite element method. Assuming that the wheelset motion is the algebraic sum of the track motion, track irregularity and wheelset snake-shaped wave, Solution Method and Response Characteristics of Coupling System. Taking the 24 m span prestressed concrete simply supported girder of Qinhe-Shenyang Special Passenger Dedicated Railway as an example, the filter method was used to analyze the spectral components of the displacement response and acceleration response of the bridge. The effects of bridge response on the track irregularities, Amplitude, snake wave wavelength and other parameters of the sensitivity.