简支梁桥上CRTSⅠ型板式无砟轨道伸缩力影响因素分析  

Influencing Factors Analysis of the Expansion Contraction Force of CRTS Slab Ballastless Track on Simply Supported Bridge

作　　者：雷振宇[1] 张鹏飞[2] 翟利华[1] 农兴中[1] LEI Zhenyu;ZHANG Pengfei;ZHAI Lihua;NONG Xingzhong(Guangzhou Metro Design and Research Institute,510010,Guangzhou,China)

机构地区：[1]广州地铁设计研究院有限公司,广州高级工程师510010 [2]华东交通大学铁路环境振动与噪声教育工程研究中心,南昌330013

出　　处：《城市轨道交通研究》2018年第8期21-25,共5页Urban Mass Transit

基　　金：国家自然科学基金项目(51768023)

摘　　要：桥上无砟轨道受力比较复杂,桥上无砟轨道无缝线路的稳定性直接影响高速列车的行车平稳与安全。基于有限元法和梁轨相互作用理论,建立了6×32 m混凝土简支梁桥上CRTSⅠ型板式无砟轨道无缝线路空间耦合模型,研究温度荷载作用下钢轨、轨道板及底座板的受力变形特性,并对相关影响参数进行分析。结果表明:在温度荷载作用下,钢轨伸缩力的峰值出现在桥梁墩台及跨中,钢轨的纵向位移呈现先增后减的趋势,在中间两跨达到最大值,钢轨和轨道板的纵向伸缩趋势基本一致,表明扣件起到了很好的约束作用;桥上采用小阻力扣件可改善桥上无缝线路梁轨相互作用,但要充分考虑轨板相对位移不能过大,保证钢轨在桥台处的爬行能够得到有效控制;从减小桥上轨道结构伸缩力及纵向位移考虑,桥梁墩台固定端纵向刚度不宜过大。The force of ballastless track on bridge is very complex,the stability of ballastless track CWR on bridge directly influences the running safety of high-speed train. Based on finite element method and the theory of bridge/rail interaction,a space coupling model of CRTS Ⅰ type ballastless track CWR on 6 × 32 m simply supported concrete bridge is established,to study the force deformation characteristics of rail,track slab and base plate under the effect of temperature load,and analyze the relevant influencing parameters. The results show that the peak of rail expansion contraction force appears in abutment,pier and middle span under temperature load,the longitudinal displacement of rail shows a tendency of increase and then decrease,the maximum value is observed between the third and fourth spans. The longitudinal contraction trend of rail and track slab are coincident approximately,it indicates that the fastener has played good restriction effect. Bridge fasteners with small resistance can improve bridge/rail interaction of CWR on the bridge,but the relative displacement between the track slab and rail cannot be too large in order to ensure the longitudinal displacement under effect control. Considering the expansion contraction force and displacement of track structure on bridge,the increase of the longitudinal stiffness of fixed ends of abutment and pier shall be restricted.

关 键 词：简支梁 无砟轨道 无缝线路 伸缩力 

分 类 号：U213.21[交通运输工程—道路与铁道工程]