中文摘要：

以重庆市跨座式单轨交通系统牛角沱至李子坝区段的预应力混凝土简支梁为研究对象，将每节车辆简化为6个自由度的动力系统，运用牛顿法建立考虑轮胎侧偏特性的跨座式单轨列车车辆的运动方程；用模态综合法建立轨道梁的运动微分方程；根据车辆和轨道梁的力协调条件，建立车辆与轨道梁动力相互作用的竖向耦合运动控制方程。采用Visual Fortan6．5编制程序，研究不同车速、不同轨道不平顺条件下轨道梁和车辆的竖向动力响应。结果表明，车速及不同轨道不平顺条件对轨道梁挠度的影响较小，但对加速度影响较大；车体的竖向加速度随车速增大而增加，车速小于40km·h^-1时，不同的轨道不平顺激励对车体竖向加速度的影响较小，而当车速大于40km·h^-1时，则影响较大。

英文摘要：

The simply-supported monorail PC beam（Z206-25 beam） in the section of the straddle type monorail transit from Niujiaotuo to Liziba in Chongqing City was selected as the research object.Each car in the monorail train was idealized as a dynamic system of 6-degree-of-freedom and the tyre cornering characteristic of the steering and stabilizing wheels were taken into account.The motion equations of the straddle type monorail vehicle were derived based on the Newton method and the motion differential equations of the track beam were derived by using modal synthesis method.The vertical governing equations of the motion for the coupled system of the straddle type monorail beam and the vehicle were derived based on the concert conditions of the force between the monorail beam and the vehicle.The vertical dynamic response of the track beam and the vehicle under different train speed and track irregularity conditions was computed by using Visual Fortan 6.5.The result shows that the effect of the train speed and the track irregularity is less on the deflection of the track beam,but their effect on the acceleration is greater.The vertical acceleration of the vehicle increases with the increase of train speed.Different track irregularity has little influence on the vehicle acceleration when the train speed is less than 40 km·h^-1,and has greater influence on it when the train speed is higher than 40 km·h^-1.