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列车荷载下桥上CRTS Ⅲ型板式无砟轨道挠曲力与位移

张鹏飞,  桂昊,  雷晓燕,  高亮

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文章导航 > 交通运输工程学报  > 2018 >  18(6): 61-72
张鹏飞, 桂昊, 雷晓燕, 高亮. 列车荷载下桥上CRTS Ⅲ型板式无砟轨道挠曲力与位移[J]. 交通运输工程学报, 2018, 18(6): 61-72. doi: 10.19818/j.cnki.1671-1637.2018.06.007
引用本文: 张鹏飞, 桂昊, 雷晓燕, 高亮. 列车荷载下桥上CRTS Ⅲ型板式无砟轨道挠曲力与位移[J]. 交通运输工程学报, 2018, 18(6): 61-72. doi: 10.19818/j.cnki.1671-1637.2018.06.007
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ZHANG Peng-fei, GUI Hao, LEI Xiao-yan, GAO Liang. Deflection force and displacement of CRTS Ⅲ slab track on bridge under train load[J]. Journal of Traffic and Transportation Engineering, 2018, 18(6): 61-72. doi: 10.19818/j.cnki.1671-1637.2018.06.007
Citation: ZHANG Peng-fei, GUI Hao, LEI Xiao-yan, GAO Liang. Deflection force and displacement of CRTS Ⅲ slab track on bridge under train load[J]. Journal of Traffic and Transportation Engineering, 2018, 18(6): 61-72. doi: 10.19818/j.cnki.1671-1637.2018.06.007
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列车荷载下桥上CRTS Ⅲ型板式无砟轨道挠曲力与位移

doi: 10.19818/j.cnki.1671-1637.2018.06.007
  • 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

  • 2.

    北京交通大学 土木建筑工程学院, 北京 100044

基金项目: 

国家自然科学基金项目 51768023

研究生创新资金项目 YC2017-S243

江西省自然科学基金项目 20171BAB206054

江西省教育厅科学技术研究项目 150548

详细信息
    作者简介:

    张鹏飞(1975-), 男, 内蒙古赤峰人, 华东交通大学副教授, 工学博士, 从事桥上无缝线路设计理论与关键技术研究

    通讯作者:

    雷晓燕(1956-), 男, 江西丰城人, 华东交通大学教授, 工学博士

  • 中图分类号: U213.213

Deflection force and displacement of CRTS Ⅲ slab track on bridge under train load

  • 1.

    Engineering Research Center of Railway Environmental Vibration and Noise of Ministry of Education, East China Jiaotong University, Nanchang 330013, Jiangxi, China

  • 2.

    School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China

More Information

    摘要
  • 摘要: 针对中国自主研发的CRTSⅢ型板式无砟轨道在运营阶段的受力变形问题, 以梁-板-轨相互作用原理为基础, 考虑钢轨、轨道板、自密实混凝土层及底座板等细部结构的空间尺寸与力学属性, 运用有限元法建立了高速铁路桥上CRTSⅢ型板式无砟轨道无缝线路精细化空间耦合模型; 计算了列车荷载作用下轨道及桥梁结构的挠曲力与位移, 分析了不同列车荷载作用长度、桥上扣件纵向阻力及墩台顶固定支座纵向刚度对挠曲力与位移的影响。研究结果表明: 在全桥加载情况下, 多跨简支梁桥上钢轨挠曲力在支座处表现为拉力, 跨中表现为压力, 大跨连续梁主桥上钢轨挠曲力在两侧边跨表现为拉力, 中间跨表现为压力, 单线加载时2种桥上有载侧钢轨挠曲力分别达到了38、53 kN, 约为双线加载时的1/2;轨道、桥梁结构纵向力与位移最大值不同时出现在同一工况下, 需要根据不同的检算部件选取最不利的列车荷载作用长度, 并将ZK活载中的集中力设置在跨中位置; 采用小阻力扣件可以改善钢轨受力与变形, 简支梁桥和连续梁桥上钢轨最大挠曲力分别减小了35%和22%, 钢轨纵向位移分别减小了7%和5%, 但轨板相对位移分别增大了26%和30%, 需加强观测以控制钢轨的爬行; 从轨道及桥梁结构的安全性与耐久性角度考虑, 建议将墩台顶纵向刚度控制在设计值的1.0~1.5倍范围内。

     

    Abstract: To study the loading and deformation of independently developed China rail track system (CRTS) Ⅲ slab tracks in the operation stage, based on the beam-slab-rail interacting principle, with full consideration of both the dimensions and mechanical properties of detail structures such as rail, track slab, self-compacting concrete layer, and bed plate, a refined space coupling model for continuous welded rails of CRTS Ⅲ slab tracks on a high-speed railway bridge was established using finite element method.The deflection force and displacement of rails andbridge structure under train load were calculated.The effects of load action length, longitudinal resistance of fasteners and longitudinal stiffness of fixed bearings atop the abutments on deflection force, and displacement were analyzed.Analysis result indicates that with the entire bridge loaded, the deflection force of the rail on the multi-span simply supported beam bridge is expressed as tension at the supports and as pressure on the mid-span.While the deflection force of the rail on the main bridge of the long-span continuous beam is expressed as tension on both sides and as pressure on the mid-span.Under the single-line loaded condition, the deflection forces of the loaded side rail on the two bridges reach 38 and 53 kN, and is approximately half of the results under the double-line loaded condition.The maximum longitudinal force and displacement of track and bridge structures will not occur under the same condition.Thus the most unfavorable condition shall be selected based on the different parts to be examined and calculated, to set the concentrated force in ZK train load to the mid-span position.The application of small resistance fasteners changes the stress and deformation acting on the rails, with the maximum deflection forces on rail of the simply supported beam bridge and continuous beam bridge decrease by 35% and 22% respectively, and the maximum longitudinal displacement on rail decrease by 7% and 5% respectively. On the contrary, the relative displacement between track slab and rail increase by 26% and 30%, which necessitates continual observation to keep rail creeping under control.From the perspective of safety and durability of tracks and bridge structures, it is proposed that the longitudinal stiffness atop the abutments be kept within 1.0-1.5 times of the design value.

     

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  • 图  1  自密实混凝土层

    Figure  1.  Self-compacting concrete layer

    下载: 全尺寸图片 幻灯片

    图  2  底座板

    Figure  2.  Bed plate

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    图  3  简支梁1/2截面

    Figure  3.  Half cross-section of simply supported beam

    下载: 全尺寸图片 幻灯片

    图  4  空间耦合有限元模型

    Figure  4.  Spatial coupling FE model

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    图  5  钢轨挠曲力曲线

    Figure  5.  Deflection force curves of rail

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    图  6  轨道板上表面纵向应力曲线

    Figure  6.  Curves of longitudinal stress on upper surface of track slab

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    图  7  轨道板下表面纵向应力曲线

    Figure  7.  Curves of longitudinal stress on lower surface of track slab

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    图  8  底座板上表面纵向应力曲线

    Figure  8.  Curves of longitudinal stress on upper surface of bed plate

    下载: 全尺寸图片 幻灯片

    图  9  底座板下表面纵向应力曲线

    Figure  9.  Curves of longitudinal stress on lower surface of bed plate

    下载: 全尺寸图片 幻灯片

    图  10  钢轨纵向位移曲线

    Figure  10.  Longitudinal displacement curves of rail

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    图  11  轨板相对位移曲线

    Figure  11.  Relative displacement curves of track slab and rail

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    图  12  列车荷载工况

    Figure  12.  Conditions of train load

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    图  13  不同列车荷载下钢轨挠曲力曲线

    Figure  13.  Curves of deflection force of rail under different train loads

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    图  14  不同列车荷载下钢轨纵向位移曲线

    Figure  14.  Curves of longitudinal displacement of rail under different train loads

    下载: 全尺寸图片 幻灯片

    图  15  不同列车荷载下轨板相对位移曲线

    Figure  15.  Curves of relative displacement between track slab and rail under different train loads

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    表  1  列车荷载作用下轨道及桥梁结构纵向力与纵向应力

    Table  1.   Longitudinal forces and stresses of track and bridge structure under train load
    下载: 导出CSV

    表  2  列车荷载作用下轨道及桥梁结构纵向位移

    Table  2.   Longitudinal displacements of track and bridge structure under train load mm
    下载: 导出CSV

    表  3  不同列车荷载下结构纵向力与纵向应力

    Table  3.   Longitudinal forces and stresses of structure under different train loads
    下载: 导出CSV

    表  4  不同列车荷载下结构纵向位移

    Table  4.   Longitudinal displacements of structure under different train loads mm
    下载: 导出CSV

    表  5  不同扣件纵向阻力下结构纵向力与纵向应力

    Table  5.   Longitudinal forces and stresses of structure under different longitudinal resistances of fastener
    下载: 导出CSV

    表  6  不同扣件纵向阻力下结构纵向位移

    Table  6.   Longitudinal displacements of structure under different longitudinal resistances of fastener mm
    下载: 导出CSV

    表  7  不同墩台刚度下结构纵向力与纵向应力

    Table  7.   Longitudinal forces and stresses of structure under different stiffnesses of pier and abutment
    下载: 导出CSV

    表  8  不同墩台刚度下结构纵向位移

    Table  8.   Longitudinal displacements of structure under different stiffnesses of pier and abutment mm
    下载: 导出CSV
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  • 收稿日期:  2018-07-13
  • 刊出日期:  2018-12-25

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