摘要
为研究小半径曲线简支梁桥上有轨电车嵌入式轨道无缝线路的力学特性,根据梁轨纵向和横向相互作用原理,采用有限元法建立三维曲线简支梁桥上嵌入式轨道无缝线路模型,详细分析了钢轨温度、曲线半径、高分子材料纵向阻力和横向刚度对钢轨和桥梁纵、横向受力和变形的影响规律。结果表明:(1)钢轨温度的增加会显著加剧伸缩工况中梁轨横向相互作用,故在进行小半径曲线桥上无缝线路设计时,需要考虑钢轨温度对桥墩横向受力的影响;(2)随着曲线半径的增加,钢轨伸缩力和梁轨纵向相对位移逐渐增加,梁轨横向相对位移和桥梁墩台横向受力则呈现整体减小的变化趋势;(3)当曲线半径大于300 m时,梁轨纵、横向相互作用与直线模型的计算结果逐渐趋于一致;(4)降低高分子材料纵向阻力可以显著减小桥梁墩台纵向和横向受力,对无缝线路力学特性而言,高分子材料横向刚度不是一个十分敏感的参数;(5)曲线半径对伸缩工况和断轨工况的影响较为显著,而对挠曲工况和制动工况的影响相对较小;(6)采用直线模型的计算结果进行钢轨强度和断缝值检算是偏安全的,但在检算小半径曲线地段桥梁墩台横向受力时需要采用曲线模型。
In order to study the mechanical characteristics of continuous welded rail of embedded track tram on simply supported bridges with small radius curves,a three-dimensional model of the continuous welded rail system was proposed using finite element method,considering both longitudinal and lateral interactions between the rail and the bridge.The study analyzed the effects of rail temperature,curve radius,longitudinal resistance and lateral stiffness of polymer materials on the longitudinal and lateral forces and deformations of both the rail and the bridge.The results showed that:(1)An increase in rail temperature significantly exacerbated the lateral interaction between the rail and the bridge under expansion conditions,suggesting that rail temperature's impact on the lateral forces on bridge piers should be considered in the design of continuous welded rail systems for small radius curves;(2)As the curve radius increased,the longitudinal expansion force of the rail and the relative longitudinal displacement between the rail and the bridge increased,while the relative lateral displacement and the lateral forces on the bridge piers decreased overall;(3)When the curve radius exceeded 300 m,the longitudinal and lateral interactions between the rail and the bridge gradually aligned with the results of straight line models;(4)Reducing the longitudinal resistance of polymer materials significantly decreased the longitudinal and lateral forces on bridge piers and abutments,whereas the influence of lateral stiffness of polymer materials was minimal;(5)The curve radius had a significant impact on expansion and rail break conditions,but a relatively smaller impact on bending and braking conditions;(6)While straight-line model calculations for rail strength and gap checks were conservatively safe,curved models were necessary for evaluating the lateral forces on bridge piers and abutments in small radius curve sections.
作者
孙魁
农兴中
肖军华
冯青松
翟利华
罗信伟
SUN Kui;NONG Xingzhong;XIAO Junhua;FENG Qingsong;ZHAI Lihua;LUO Xinwei(Guangzhou Metro Design and Research Institute Co.,Ltd.,Guangzhou 510010,China;Key Laboratory of Road and Traffic Engineering of the Ministry of Education,Tongji University,Shanghai 201804,China;State Key Laboratory of Performance Monitoring Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013,China)
出处
《铁道标准设计》
北大核心
2024年第9期68-74,共7页
Railway Standard Design
基金
国家自然科学基金项目(52178423)
广东省城市轨道交通工程建造新技术企业重点实验室(51678447)。
关键词
无缝线路
有轨电车
嵌入式轨道
简支梁
小半径曲线
高分子材料
continuous welded rail
tram
embedded rail track
simply supported bridge
small radius curve
polymer materials
