Analysis of longitudinal force regulation for CWR on railway cable-stayed bridge
Article Text (Baidu Translation)
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摘要: 运用梁轨相互作用原理, 建立了斜拉桥上无缝线路纵向力计算模型, 编制了计算软件, 以一座铁路常用双塔钢桁斜拉桥为例, 研究了斜拉桥上无缝线路纵向力规律。分析结果表明: 可将斜拉桥简化为跨中设置固定支座的连续梁进行钢轨伸缩力计算; 计算钢轨挠曲力时, 可在斜拉桥主跨及其邻跨上布置荷载, 或仅在斜拉桥主跨上布置荷载, 而且不必考虑列车入桥方向的变化; 铁路斜拉桥需设置速度锁定器以有效限制列车制动作用下的主梁纵向位移, 减小线路受力变形; 斜拉桥上铺设无缝线路应采用梁轨相互作用法以精确计算钢轨断缝值。Abstract: Based on the theory of track-bridge interaction, the calculation model of longitudinal force for continuous welded rail (CWR) on cable-stayed bridge was established, and the related calculation software was compiled.Taking a double-tower steel truss cable-stayed bridge commonly used in the railway as an example, the longitudinal force regulations of CWR were analyzed.Analysis result shows that the cable-stayed bridge can be simplified as a continuous beam with fixed bearing in the middle to calculate rail expansion forces.Rail bending forces can be calculated under the conditions of loads laid on main span and its adjacent span or the separate main span, and the direction change of train needn't be considered.Speed locking devices should be set on railway cable-stayed bridge to effectively limit the main beam longitudinal displacement under train braking force, and rail deformation decreases simultaneously.The method of trackbridge interaction should be used for cable-stayed bridge with CWR to calculate rail broken gap value accurately.
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图 1 斜拉桥梁轨相互作用计算模型
Figure 1. Calculation model of track-bridge interaction for cable-stayed bridge
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