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CRTS 型轨道板的高频振动疲劳特性分析

陈醉 刘学毅 胡颖 曹瑞恒 肖杰灵 杨荣山

陈醉, 刘学毅, 胡颖, 曹瑞恒, 肖杰灵, 杨荣山. CRTS Ⅱ型轨道板的高频振动疲劳特性分析[J]. 西南交通大学学报, 2022, 57(1): 106-111, 119. doi: 10.3969/j.issn.0258-2724.20210030
引用本文: 陈醉, 刘学毅, 胡颖, 曹瑞恒, 肖杰灵, 杨荣山. CRTS 型轨道板的高频振动疲劳特性分析[J]. 西南交通大学学报, 2022, 57(1): 106-111, 119. doi: 10.3969/j.issn.0258-2724.20210030
CHEN Zui, LIU Xueyi, HU Ying, CAO Ruiheng, XIAO Jieling, YANG Rongshan. Fatigue Characteristic of High-Frequency Vibration for CRTS Ⅱ Track Slab[J]. Journal of Southwest Jiaotong University, 2022, 57(1): 106-111, 119. doi: 10.3969/j.issn.0258-2724.20210030
Citation: CHEN Zui, LIU Xueyi, HU Ying, CAO Ruiheng, XIAO Jieling, YANG Rongshan. Fatigue Characteristic of High-Frequency Vibration for CRTS Track Slab[J]. Journal of Southwest Jiaotong University, 2022, 57(1): 106-111, 119. doi: 10.3969/j.issn.0258-2724.20210030

CRTS 型轨道板的高频振动疲劳特性分析

doi: 10.3969/j.issn.0258-2724.20210030
基金项目: 国家自然科学基金(51978584,51778543)
详细信息
    作者简介:

    陈醉(1993—),男,博士研究生,研究方向为轨道结构与轨道力学,E-mail:chenzui321@my.swjtu.edu.cn

    通讯作者:

    刘学毅(1962—),男,教授,博士,研究方向为髙速、重载轨道结构及轨道动力学,E-mail:xyliu@swjtu.edu.cn

  • 中图分类号: U213.31

Fatigue Characteristic of High-Frequency Vibration for CRTS Track Slab

  • 摘要:

    列车轮载作用会引发轨道板的高频自振效应. 为分析高频荷载下CRTS Ⅱ型轨道板的疲劳特性以及板体自振效应对疲劳寿命的影响程度,基于现有的疲劳损伤准则,探究轮对作用间隙阶段轨道板自振影响下的疲劳特性. 对脱空长度影响下轨道板的疲劳寿命进行预测,并与仅考虑荷载作用次数的结果进行对比. 结果表明:轨道结构完好时,列车轮载引发轨道板伤损的可能性较小;若列车行车速度为360 km/h,列车轮载在引发轨道板共振前即发生板底开裂;轨道结构完好时,列车轮载引发的板体自振效应对轨道板疲劳损伤影响程度最大,此时列车轮载对轨道板产生约1.8倍的疲劳荷载当量;当轨道板脱空长度大于2.0倍枕距后,可忽略板体自振对疲劳损伤的影响;轨道板的脱空长度大于3.2倍枕距后,现场无砟轨道难以维持60 a的使用寿命.

     

  • 图 1  轨道结构垂向振动分析模型

    Figure 1.  Vertical vibration analysis model of track structure

    图 2  有限元模型局部示意

    Figure 2.  Local schematic diagram of finite element model

    图 3  轨道板弯矩时程分布规律

    Figure 3.  Time history distribution of track slab bending moments

    图 4  局部脱空影响下轨道板自振频率

    Figure 4.  Natural frequencies of track slab under the effect of partial de-bonding

    图 5  引发轨道结构共振的临界轴距

    Figure 5.  Critical wheelbase for resonance of track structure

    图 6  不同脱空长度下轨道板疲劳寿命值

    Figure 6.  Fatigue lifes of track slab with different de-bonding lengths

    表  1  主要计算参数

    Table  1.   Main calculation parameters

    部件项目取值
    钢轨弹性模量/Pa2.06 × 1011
    惯性矩/m47.745 × 10−3
    密度/(kg•m−37850
    泊松比0.30
    扣件刚度/(N•m−16.0 × 107
    轨道板弹性模量/Pa3.55 × 1010
    密度/(kg•m−32400
    泊松比0.20
    宽度(厚度)/m2.55 (0.20)
    CA砂浆弹性模量/Pa7.0 × 109
    厚度/m0.03
    单向受压刚度/(N•m−25.95 × 1011
    下载: 导出CSV
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  • 收稿日期:  2021-01-11
  • 修回日期:  2021-05-17
  • 网络出版日期:  2021-05-20
  • 刊出日期:  2021-05-20

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