摘要
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。
Track-bridge interaction was simulated by using nonlinear spring, and the simulation method was proved based on the experimental results of related documents. Taking a U-shape section and single-tower cable-stayed bridge on Shanghai-Kunming Passenger Dedicated Line as an example, the spatial finite element model of tower-cable-rail-beam-pier was established by using large general-purpose finite element software ANSYS. The transfer law of rail longitudinal force on cable-stayed bridge was analyzed, and the impacts of design parameters on rail longitudinal force were studied, the design parameters included longitudinal resistance model, cable-stayed bridge structure system, temperature load, wind load and so on. Analysis result shows that rail longitudinal resistance can be simplified in accordance with ideal elastic-plastic model. Compared with floating system, rail longitudinal force reduces by about 30% through tower and beam consolidation. When calculating rail expansion force, load can be applied according to beam increasing-temperature 15°C and cable increasing-temperature 40 °C. In windy areas, rail longitudinal force on cable-stayed bridge caused by wind can be larger than 60 kN. 6 tabs, 7 figs, 15 refs.
出处
《交通运输工程学报》
EI
CSCD
北大核心
2012年第1期31-37,共7页
Journal of Traffic and Transportation Engineering
基金
国家自然科学基金项目(50678176)
关键词
桥梁工程
斜拉桥
梁轨相互作用
客运专线
设计参数
bridge engineering
cable-stayed bridge
track-bridge interaction
passenger dedicatedline
design parameter
