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采用非线性弹簧模拟桥梁和轨道的相互作用,根据相关文献的试验结果对模拟方法进行验证。以沪昆客运专线上某槽型截面独塔斜拉桥为算例,采用大型通用有限元软件ANSYS建立了塔-索-轨-梁-墩统一的空间有限元模型,对斜拉桥钢轨纵向力的传递规律进行了分析,研究了纵向阻力模型、斜拉桥结构体系、温度荷载与风荷载等设计参数对钢轨纵向力的影响。分析结果表明:钢轨纵向阻力可按理想弹塑性模型进行简化;与漂浮体系相比,塔梁固结可减小约30%的钢轨纵向力;在计算钢轨伸缩力时可按照梁体升温15℃和拉索升温40℃加载;在风速较大的地区,风力引起的斜拉桥上钢轨纵向力可超过60kN。
The non-linear spring is used to simulate the interaction between bridge and track, and the simulation method is verified according to the test results of related literatures. Taking the single-pylon cable-stayed bridge with a grooved section on the Shanghai-Kunming Passenger Dedicated Railway as an example, a unified finite element model of the tower-cable-rail-beam-pier was established by using the large-scale general finite element software ANSYS. The law of transmission of force is analyzed and the influence of longitudinal resistance model, structural system of cable-stayed bridge, temperature and wind load on the longitudinal force of rail are studied. The results show that the rail longitudinal resistance can be simplified according to the ideal elastic-plastic model. Compared with the floating system, the tower girder consolidation can reduce about 30% of the rail longitudinal force. When calculating the rail retracting force, And cable heating 40 ℃ load; wind speed in large areas, the cable-stayed bridge caused by wind longitudinal force can exceed 60kN.