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道床板钢筋锈蚀的细观力学影响

苏成光 刘丹 赵坪锐 刘学毅

苏成光, 刘丹, 赵坪锐, 刘学毅. 道床板钢筋锈蚀的细观力学影响[J]. 西南交通大学学报, 2020, 55(2): 273-281, 289. doi: 10.3969/j.issn.0258-2724.20190321
引用本文: 苏成光, 刘丹, 赵坪锐, 刘学毅. 道床板钢筋锈蚀的细观力学影响[J]. 西南交通大学学报, 2020, 55(2): 273-281, 289. doi: 10.3969/j.issn.0258-2724.20190321
SU Chengguang, LIU Dan, ZHAO Pingrui, LIU Xueyi. Meso-mechanical Effect of Track Slab Rebar Corrosion[J]. Journal of Southwest Jiaotong University, 2020, 55(2): 273-281, 289. doi: 10.3969/j.issn.0258-2724.20190321
Citation: SU Chengguang, LIU Dan, ZHAO Pingrui, LIU Xueyi. Meso-mechanical Effect of Track Slab Rebar Corrosion[J]. Journal of Southwest Jiaotong University, 2020, 55(2): 273-281, 289. doi: 10.3969/j.issn.0258-2724.20190321

道床板钢筋锈蚀的细观力学影响

doi: 10.3969/j.issn.0258-2724.20190321
详细信息
    作者简介:

    苏成光(1989—),男,工程师,博士,研究方向为高速重载轨道结构与轨道动力学,E-mail:cguangs@163.com

  • 中图分类号: U213.2 44

Meso-mechanical Effect of Track Slab Rebar Corrosion

  • 摘要: 为探究钢筋锈蚀对双块式无砟轨道道床板混凝土的影响,建立了道床板混凝土细观尺度力学模型,研究了钢筋锈蚀时不同钢筋直径、间距、保护层厚度的道床板受力性能及损伤破坏模式,分析了列车荷载和温度荷载对锈胀钢筋混凝土道床板力学性能的影响. 研究结果表明:钢筋锈蚀引起的道床板开裂模式主要与钢筋保护层厚度有关,与钢筋直径和间距关系小;道床板内部裂缝贯通时的锈胀位移随着钢筋间距的增大而增大,当保护层厚度为60 mm,钢筋间距为120 mm时,61.2 μm的钢筋锈胀位移就会引起道床板内部裂缝贯通;列车荷载对锈蚀后的道床板损伤影响小,且会使道床板受力趋于均匀;整体降温30 ℃和负温度梯度荷载均会使锈胀道床板拉伸损伤进一步明显增大,在道床板水平及垂向产生贯通裂缝;整体升温30 ℃和正温度梯度荷载作用对锈胀道床板损伤影响小.

     

  • 图 1  钢筋锈胀非均匀分布轮廓线

    Figure 1.  Non-uniform distribution profile diagram for rebar corrosion

    图 2  车辆-无砟轨道耦合动力学模型

    Figure 2.  Coupling dynamic model of vehicle-ballastless track

    图 3  混凝土细观尺度力学模型

    Figure 3.  Meso-scale mechanical model of concrete

    图 4  相关参数示意

    Figure 4.  Schematic diagram of related parameters

    图 5  数值模拟与试验结果对比

    Figure 5.  Comparison between numerical simulation result and experimental result

    图 6  工况(2)损伤破坏过程

    Figure 6.  Damage Process under condition (2)

    图 7  工况(4)第1主应力

    Figure 7.  First principal stress under condition (4)

    图 8  不同工况下道床板拉伸损伤云图

    Figure 8.  Tension damage of track slabs in different conditions

    图 9  列车荷载作用对锈胀道床板压缩损伤的影响

    Figure 9.  Compression damages of track slabs with corrosion under train load

    图 10  列车荷载作用对锈胀道床板拉伸损伤的影响

    Figure 10.  Tension damages of track slabs with corrosion under train load

    图 11  列车荷载作用对锈胀道床板第1主应力的影响

    Figure 11.  First principal stresses on track slabs with corrosion under train load

    图 12  温度荷载作用对锈胀道床板压缩损伤的影响

    Figure 12.  Compression damages of track slabs with corrosion under temperature load

    图 13  温度荷载作用对锈胀道床板拉伸损伤的影响

    Figure 13.  Tension damages of track slabs with corrosion under temperature load

    表  1  力学参数

    Table  1.   Mechanical Parameters

    材料弹性模量/GPa泊松比抗拉强度/MPa
    骨料70.00.16
    砂浆25.80.20 1.86
    界面23.40.221.53
    下载: 导出CSV

    表  2  工况表

    Table  2.   Operating Conditions

    工况d/mmc/mms/mms/c
    (1) 14 40 80 2
    (2) 16 40 120 3
    (3) 20 40 160 4
    (4) 20 60 120 2
    (5) 14 60 180 3
    (6) 16 60 240 4
    (7) 16 80 160 2
    (8) 20 80 240 3
    (9) 14 80 320 4
    下载: 导出CSV

    表  3  混凝土裂缝贯通时的锈胀位移

    Table  3.   Corrosion displacement when concrete cracks connect together μm

    工况锈胀位移u1
    内部裂缝贯通外部裂缝贯通
    (1) 65.5 74.4
    (2) 75.7 64.5
    (3) 135.7 222.1
    (4) 61.2
    (5) 102.7
    (6) 157.2
    (7) 82.0
    (8) 121.3
    (9) 226.4
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-04-16
  • 修回日期:  2019-06-27
  • 网络出版日期:  2020-01-03
  • 刊出日期:  2020-04-01

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