高速铁路斜拉桥上无缝线路纵向力研究

CWR Longitudinal Force of Cable-stayed Bridge of High-speed Railway

采用带刚臂的梁单元模拟桥梁,用非线性弹簧模拟线路纵向阻力,并采用相关文献试验结果进行验证。以该模型为基础,建立塔-索-轨-梁-墩-桩的斜拉桥整体空间有限元模型。以沪昆高速铁路某(32+80+112)m槽型截面单塔斜拉桥为例,对斜拉桥上无缝线路纵向力传递规律进行分析;计算纵向力对斜拉索和塔墩影响;探讨桥梁截面形式、线路纵向阻力模型、斜拉桥约束方式、主梁和拉索温度变化、风压以及钢轨伸缩调节器设置位置等设计参数对纵向力影响;提出相关取值建议。

The beam element with rigid arm was used to simulate the bridge,the nonlinear springs were used to simulate the longitudinal resistances of rail and the bridge-track interactions were verified with reference to the experimental results specified in relevant Documents.On the above basis,the tower-cable-rail-beam-pier-pile finite element model of the cable-stayed bridge was established.The（32＋80＋112） m U-sharp section and single-tower cable-stayed bridge of the Shanghai-Kunming High-speed Railway was taken for case-study： The transmission law of CWR（continuously welded rail） longitudinal forces on the cable-stayed bridge was analyzed;the impact of the longitudinal forces on the cable and tower was calculated;the influence of the design parameters such as the bridge section,the longitudinal resistance model of rail,the restraint plan of the cable-stayed bridge,the temperature variations of the main beam and cable,wind pressures,the rail expansion regulator positions and so on on was studied;recommendations were made for determination of related values.