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本文用有限元位移法分析了我国定型设计中铁路简支下承式钢桁架桥车荷载作用下的动力响应。文中将每一车辆作为有13个自由度的振动体系,将桁架桥作为具有有限个节点集中质量的空间结构,推导了列车过桥时考虑路面不平及轨道运动的车辆振动微分方程和车—桥之间的联系方程。模拟计算了列车以不同速度过桥时车—桥的空间动力响应。所得结果描述了列车过桥时车—桥体系的振动状态及过程。文中得出的因空间振动产生的桥梁变形及内力以及车辆振动的计算结果,是按平面分析法所不能得到的。
In this paper, the finite element displacement method is used to analyze the dynamic response of the railway simply supported single-girder truss bridge under the load in China’s stereotype design. In this paper, each vehicle is regarded as a vibration system with 13 degrees of freedom. The truss bridge is regarded as a spatial structure with a limited number of nodes. The differential equations of vehicle vibration and vehicle-bridge The contact equation between. The space-dynamic response of the car-bridge is simulated and calculated when the train crosses the bridge at different speeds. The results describe the train-bridge system when the bridge vibration state and process. The calculation results of bridge deformation, internal force and vehicle vibration caused by space vibration can not be obtained by plane analysis.