千米级跨度铁路桥梁的受力性能研究

Research on the Mechanical Performance of Railway Bridges with Spans over 1000m

结合上海至南通铁路过江通道工程,针对设计构思的千米级跨度桥梁方案,进行主跨1 008 m斜拉桥和悬索桥力学性能研究。按照我国双线铁路标准布置荷载,考虑客货共用,进行桥梁静力变形分析和车桥耦合动力仿真分析。结果表明,在时速80 km货运列车和时速200 km客运列车作用下,跨度1 008 m斜拉桥和悬索桥的静、动力变形性能均满足安全行车的要求,桥梁结构具有良好的刚度;我国铁路现行机车车辆的运行平稳性或乘坐舒适性指标达到"良好"标准。说明上海至南通铁路过江通道采用千米级跨度铁路斜拉桥和悬索桥在技术上可行。

Based on Yangtze River crossing railway passage project connecting Shanghai and Nantong, the mechanical performances of a cable-stayed bridge and a suspension bridge schemes with 1 008 m spans were analyzed for the design conception comparison of super major bridge with spans over 1 000 m. The double line railway was designed as per Chinese standard for common use of both passenger trains and freight trains. Static deflection analysis and interaction simulation of bridge and train were carried out. Analysis results indicate that under the load application of Chinese freight train at a speed of 80 km · h^ -1 or passenger train at a speed of 200 km · h^-1 , both the static and the dynamic deformation properties of cable-stayed or suspension bridge with 1 008 m span can meet the requirements for safe train operation. The bridge structure has good rigidity. The dynamic running steadiness and the comfort index of currently adopted Chinese trains can be evaluated as ＂satisfactory＂. It can be concluded that the application of cable-stayed bridge or suspension bridge with spans over 1 000 m in Shanghai to Nantong railway passage project is technically feasible.