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在役钢桥面板纵肋与顶板焊根疲劳裂纹内焊加固方法

张清华 李明哲 李俊 王昊 高兴

张清华, 李明哲, 李俊, 王昊, 高兴. 在役钢桥面板纵肋与顶板焊根疲劳裂纹内焊加固方法[J]. 交通运输工程学报, 2024, 24(1): 85-99. doi: 10.19818/j.cnki.1671-1637.2024.01.005
引用本文: 张清华, 李明哲, 李俊, 王昊, 高兴. 在役钢桥面板纵肋与顶板焊根疲劳裂纹内焊加固方法[J]. 交通运输工程学报, 2024, 24(1): 85-99. doi: 10.19818/j.cnki.1671-1637.2024.01.005
ZHANG Qing-hua, LI Ming-zhe, LI Jun, WANG Hao, GAO Xing. Internal welding reinforcement method for fatigue crack at weld root on rib-to-deck of in-service steel bridge deck[J]. Journal of Traffic and Transportation Engineering, 2024, 24(1): 85-99. doi: 10.19818/j.cnki.1671-1637.2024.01.005
Citation: ZHANG Qing-hua, LI Ming-zhe, LI Jun, WANG Hao, GAO Xing. Internal welding reinforcement method for fatigue crack at weld root on rib-to-deck of in-service steel bridge deck[J]. Journal of Traffic and Transportation Engineering, 2024, 24(1): 85-99. doi: 10.19818/j.cnki.1671-1637.2024.01.005

在役钢桥面板纵肋与顶板焊根疲劳裂纹内焊加固方法

doi: 10.19818/j.cnki.1671-1637.2024.01.005
基金项目: 

国家自然科学基金项目 52278318

广东省重点领域研发计划项目 2019B111106002

桥梁结构健康与安全国家重点实验室开放课题 BHSKL19-06-KF

四川省交通科技项目 2019-ZL-12

四川省科技计划项目 2021YJ0037

详细信息
    作者简介:

    张清华(1975-),男,河南虞城人,西南交通大学教授,工学博士,从事钢桥疲劳问题研究

    通讯作者:

    李明哲(1995-),男,山东金乡人,西南交通大学工学博士研究生

  • 中图分类号: U445.72

Internal welding reinforcement method for fatigue crack at weld root on rib-to-deck of in-service steel bridge deck

Funds: 

National Natural Science Foundation of China 52278318

Research and Development Plan Project in Key Areas of Guangdong Province 2019B111106002

Open Project of State Key Laboratory for Health and Safety of Bridge Structures BHSKL19-06-KF

Transportation Science and Technology Project of Sichuan Province 2019-ZL-12

Science and Technology Plan Project of Sichuan Province 2021YJ0037

More Information
  • 摘要:

    为实现纵肋与顶板焊根疲劳裂纹的有效加固,提出了能够满足在役钢桥面板加固需求的内焊加固方法,研发了自动化焊接机器人和相关关键装备;设计了4个试验模型对方法和装备的有效性和适用性进行研究,验证了纵肋与顶板焊根产生疲劳裂纹的开裂模式;使用所研发的专用焊接设备在纵肋内部进行焊接加固,进行了加固结构的疲劳破坏试验;对比了试验结果与有限元模拟结果,分析了加固后结构的疲劳性能,验证了内焊加固方法的有效性。研究结果表明:内焊加固方法能够将既有的焊根裂纹转化为内部缺陷,研发的装备能够实现原位加固,有效抑制疲劳裂纹的扩展,使已开裂焊接细节的疲劳寿命提高了66%~157%;由于各开裂模式具有不同程度疲劳损伤累积,加固后焊接细节会发生主导开裂模式迁移;对于包含多开裂模式的焊接细节,加固后的剩余疲劳寿命与各开裂模式的实际疲劳损伤累积程度以及加固方法对各开裂模式受力特性的扰动程度两方面的因素密切相关。

     

  • 图  1  纵肋与顶板焊接细节疲劳开裂模式

    Figure  1.  Fatigue cracking modes of rib-to-deck welded joints

    图  2  焊根开裂及内焊加固(单位:mm)

    Figure  2.  Weld root crack and internal welding reinforcement (unit: mm)

    图  3  内焊加固前后裂纹扩展寿命变化曲线

    Figure  3.  Life change curves of crack propagation before and after internal welding reinforcement

    图  4  内焊加固方法的实现

    Figure  4.  Realization of internal welding reinforcement method

    图  5  内焊加固实施流程

    Figure  5.  Implementation process of internal welding reinforcement

    图  6  纵肋的恢复与补强

    Figure  6.  Recovery and reinforcement of rib

    图  7  疲劳试验装置与现场布置

    Figure  7.  Fatigue testing apparatus and site layout

    图  8  试验模型尺寸(单位:mm)

    Figure  8.  Dimensions of test specimen (unit: mm)

    图  9  应变测点位置和测点编号(单位:mm)

    Figure  9.  Strain measuring point locations and corresponding identifiers (unit: mm)

    图  10  有限元值与试验值对比

    Figure  10.  Comparison of finite element and test values

    图  11  关键测点的应变变化曲线

    Figure  11.  Strain change curves of key measuring points

    图  12  纵肋与顶板焊接细节疲劳裂纹

    Figure  12.  Fatigue cracks of rib-to-deck welded joints

    图  13  关键测点的应变变化

    Figure  13.  Strain changes of key measuring points

    图  14  纵肋与顶板焊接细节加固后疲劳裂纹

    Figure  14.  Fatigue cracks of rib-to-deck welded joint after reinforcement

    图  15  有限元模型与初始微裂纹

    Figure  15.  Finite element model and initial microcrack

    图  16  裂纹扩展规律

    Figure  16.  Crack propagation laws

    图  17  焊根加固前后累积损伤度

    Figure  17.  Cumulative damage degrees before and after reinforcement at weld root

    图  18  焊趾加固前后累积损伤度

    Figure  18.  Cumulative damage degrees before and after reinforcement at weld toe

    表  1  加载方案

    Table  1.   Load schemes

    模型编号 焊接类型 荷载幅/kN 应力比
    阶段1 阶段2
    MRD-Ⅰ 单面焊 50 50 1/11
    MRD-Ⅱ 单面焊 45 45 1/10
    MRD-Ⅲ 单面焊 45 45 1/10
    MRD-Ⅳ 双面焊 50 1/11
    下载: 导出CSV

    表  2  阶段1的疲劳试验结果

    Table  2.   Fatigue test results of stage 1

    模型 开裂模式 作用次数/万次 降幅/%
    N10 N25 Nf
    MRD-Ⅰ 焊根裂纹 28.7 44.7 63.5 61.0
    MRD-Ⅱ 61.5 86.2 108.5 41.0
    MRD-Ⅲ 55.5 74.4 134.0 76.5
    MRD-Ⅳ 内侧焊趾 45.4 73.2 90.0 51.0
    下载: 导出CSV

    表  3  阶段2的疲劳试验结果

    Table  3.   Fatigue test results of stage 2

    模型 开裂模式 作用次数/万次 降幅/%
    N10 N25 Nf
    MRD-Ⅰ 外侧焊趾 41.5 68.0 123.0 64.9
    MRD-Ⅱ 58.5 75.7 124.0 60.0
    MRD-Ⅲ 33.5 45.3 50.0 44.0
    下载: 导出CSV

    表  4  阶段1疲劳性能寿命预测

    Table  4.   Fatigue performance life prediction of stage 1

    模型 N10/万次 N25/万次 Nf/万次
    试验 预测 试验 预测 试验 预测
    MRD-Ⅰ 28.7 33.1 44.7 42.8 63.5 61.7
    MRD-Ⅱ 61.5 63.9 86.2 77.1 108.5 100.7
    MRD-Ⅲ 55.5 59.5 74.4 71.0 134.0 131.0
    下载: 导出CSV

    表  5  MRD-Ⅲ裂尖应力强度因子

    Table  5.   MRD-Ⅲ crack tip stress intensity factors

    a/mm c/mm 加载阶段 应力强度因子/(MPa·mm1/2)
    A点 B点 C点
    8.7 28.0 阶段1 417.2 260.7 415.7
    阶段2 107.8 80.4 106.5
    下载: 导出CSV
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  • 收稿日期:  2023-07-28
  • 网络出版日期:  2024-03-13
  • 刊出日期:  2024-02-25

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