大坡道桥上无砟轨道梁端过渡板力学性能分析  

Mechanical performance analysis of transition slab near beam-end of ballastless track on large ramp bridge

作　　者：张鹏飞[1] 温月 涂建 陈华鹏 ZHANG Pengfei;WEN Yue;TU Jian;CHEN Huapeng(Education Ministry Engineering Research Center for Railway Environmental Vibration and Noise,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学铁路环境振动与噪声教育部工程研究中心,江西南昌330013

出　　处：《铁道科学与工程学报》2022年第8期2320-2329,共10页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(52178425,51768023);国家重点研发计划项目(2021YFE0105600);江西省教育厅重点项目(GJJ180290)。

摘　　要：为研究大坡道桥上CRTSⅢ型板式无砟轨道无缝线路梁端轨道结构力学性能变化规律,基于有限元法和梁-板-轨相互作用机理,建立桥上无砟轨道无缝线路梁端过渡板结构空间精细化有限元模型,分析桥梁梁体温差、温度跨度以及梁体坡度等因素对增设过渡板后梁端轨道结构力学性能的影响。分析结果表明:梁端轨道结构受力随桥梁梁体温差、温度跨度和桥梁纵向坡度增大而增大,与之相反,轨道板稳定系数逐渐变小;位于坡道上的桥梁增设过渡板后,梁端轨道结构受力明显减小,轨道板稳定系数显著增加;当桥梁纵向坡度为20‰,桥梁温度跨度由88 m增加至210 m时,桥梁梁端处扣件最大拉力和最大压力分别增大2.4倍和2.5倍,钢轨弯曲应力近似线性增加,轨道板稳定系数呈小幅度减小趋势;当梁体温度跨度为101 m,桥梁纵向坡度由5‰增大至35‰时,桥梁梁端处扣件最大拉力和最大压力均增大了近3.2倍,钢轨弯曲应力线性增加,轨道板稳定系数变化幅度在梁体纵向坡度取10‰时发生突变,幅度明显变小,减小趋势变缓;在平坡地段,梁体温度跨度变化引起的梁端轨道结构力学性能变化很小。研究成果可为大坡道桥梁梁端轨道结构设计以及轨道结构安全服役和运营维护提供参考。In order to study the variation patterns of the mechanical performance of continuous welded rails(CWR)of beam-end CRTS III ballastless slab track on the bridge structure of large slope,based on the finite element method and the beam plate rail interaction mechanism,a spatial refined finite element model of the beamend transition plate structure of the ballastless CWR track on the bridge was established,and the effects of the temperature difference,temperature span and beam slope on the mechanical properties of the beam-end track structure with an additional transition slab were analyzed.The analysis results show that the force of the beamend track structure increases with the increase of beam temperature,temperature span and beam slope.On the contrary,the stability coefficient of the track slab decreases with the increase of beam temperature,temperature span and beam slope.After adding a transition slab to the bridge on the slope,the force of the beam-end track structure is significantly reduced,and the stability coefficient of the track slab is significantly increased.When the longitudinal slope of the bridge is 20‰and the temperature span of the bridge is increased from 88 m to 210 m,the maximum tensile stress of the fasteners at the end of the bridge beam increases by 2.4 times,the maximum compressive stress increases by 2.5 times,the bending stress of rail increases approximately linearly,and the stability coefficient of the track slab decreases slightly.When the beam temperature span is 101 m and the bridge slope is increased from 5‰to 35‰,the maximum tensile stress and compressive stress of the fasteners at the beam-end increases by nearly 3.2 times,and the bending stress of rail increases linearly.The amplitude of the track slab stability coefficient changes suddenly when the longitudinal slope of the beam is 10‰,the amplitude is obviously smaller,and the decreasing trend becomes slower.In the flat section,the change of the mechanical performance of the beam-end track structure caused by the change

关 键 词：高速铁路 大坡道桥梁 梁端轨道结构 过渡板 温度荷载 

分 类 号：U213.212[交通运输工程—道路与铁道工程]