CRTS <b>Ⅱ</b>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

doi:10.3969/j.issn.0258-2724.20210030

CRTS Ⅱ型轨道板的高频振动疲劳特性分析

doi: 10.3969/j.issn.0258-2724.20210030

陈醉^{1, 2,},
刘学毅^{1, 2, ,},
胡颖^{1, 2},
曹瑞恒^{1, 2},
肖杰灵^{1, 2},
杨荣山^{1, 2}

1.
西南交通大学高速铁路线路工程教育部重点实验室，四川成都 610031
2.
西南交通大学土木工程学院，四川成都 610031

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
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- 被引次数: 0
出版历程
- 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

Fatigue Characteristic of High-Frequency Vibration for CRTS Ⅱ Track Slab

CHEN Zui^{1, 2
,},
LIU Xueyi^{1, 2
, ,},
HU Ying^{1, 2},
CAO Ruiheng^{1, 2},
XIAO Jieling^{1, 2},
YANG Rongshan^{1, 2}

1.
MOE Key Laboratory of High-Speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China
2.
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

摘要

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.
- 无砟轨道 /
- CRTS Ⅱ型轨道板 /
- 疲劳特性 /
- 板体自振 /
- 局部脱空
Abstract:
The effect of the wheel load could cause the self-vibration effect of high frequency for the track slab. To analyze the fatigue characteristic of CRTS Ⅱ track slab under high-frequency load and the effect of the self-vibration of the track slab on its fatigue life, the fatigue characteristics of the track slab under the influence of this self-vibration during the interval in the wheelset was explored on the basis of existing fatigue damage criteria. The fatigue life of the track slab was predicted with reference to the effect of the de-bonding length, and the results obtained were compared with the results obtained when only the number of load actions was considered. Results show that, the possibility of damage to the track slab caused by the train wheel load is reduced when the track structure is intact. The bottom of the track slab would crack before resonance triggering occurred if the train speed was 360 km/h. When the track structure is intact, the self-vibration effect in the track slab caused by the wheel load has its greatest impact on the fatigue damage to the track slab, and the wheel load produces approximately 1.8 times the equivalent fatigue load to the track slab. The effect of the self-vibration effect in the track slab on the fatigue damage could be ignored when the slab de-bonding length is more than twice the distance between sleepers. When de-bonding length of the track slab is more than 3.2 times the distance between sleepers, it becomes difficult for the ballastless track on-site to maintain its expected 60-year service life.
- ballastless track /
- CRTS Ⅱ track slab /
- fatigue characteristic /
- slab self-vibration /
- partial de-bonding

HTML全文

图 1 轨道结构垂向振动分析模型

Figure 1. Vertical vibration analysis model of track structure

下载: 全尺寸图片幻灯片

图 2 有限元模型局部示意

Figure 2. Local schematic diagram of finite element model

下载: 全尺寸图片幻灯片

图 3 轨道板弯矩时程分布规律

Figure 3. Time history distribution of track slab bending moments

下载: 全尺寸图片幻灯片

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

下载: 全尺寸图片幻灯片

图 5 引发轨道结构共振的临界轴距

Figure 5. Critical wheelbase for resonance of track structure

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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

下载: 全尺寸图片幻灯片

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/Pa	2.06 × 10¹¹
	惯性矩/m⁴	7.745 × 10⁻³
	密度/（kg•m⁻³）	7850
	泊松比	0.30
	扣件刚度/（N•m⁻¹）	6.0 × 10⁷
轨道板	弹性模量/Pa	3.55 × 10¹⁰
	密度/（kg•m⁻³）	2400
	泊松比	0.20
	宽度（厚度）/m	2.55 （0.20）
CA砂浆	弹性模量/Pa	7.0 × 10⁹
	厚度/m	0.03
	单向受压刚度/（N•m⁻²）	5.95 × 10¹¹

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