简支梁动力系数与列车速度的关系研究

Study on the relationship of train speed and dynamic coefficient of simply supported beam

为了研究速度与动力系数的关系,建立了车桥耦合的动力学系统模型,计算了不同位置、不同类型的桥梁动力系数,探讨了不同动力系数随速度的变化规律。得出在0 km/h^350 km/h速度范围中的简支梁,3/4跨处的动力系数较跨中更能反映桥梁位移、内力随着速度同时增大的动力特性。

In order to study the relationship between speed and power coefficient, the vertical vibration matrix equation of the train-bridge system are established. Displacement and internal force dynamic coefficient in different positions are calculated and the law of bridge dynamic coefficient is summarized, it obtains simply-supported beam within the speed scope of 0 km/h ~ 350 km/h. Displacement dynamic coefficient in the three- quarters of the bridge spans can represent characteristic of bridge displacement, internal force with velocity increase at the same time.