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缅甸某悬索桥主缆开缆检测及承载力评估

陈小雨 唐茂林

陈小雨, 唐茂林. 缅甸某悬索桥主缆开缆检测及承载力评估[J]. 西南交通大学学报, 2022, 57(5): 1130-1136. doi: 10.3969/j.issn.0258-2724.20200393
引用本文: 陈小雨, 唐茂林. 缅甸某悬索桥主缆开缆检测及承载力评估[J]. 西南交通大学学报, 2022, 57(5): 1130-1136. doi: 10.3969/j.issn.0258-2724.20200393
CHEN Xiaoyu, TANG Maolin. Main Cable Opening Inspection and Bearing Capacity Evaluation of Suspension Bridge in Service in Myanmar[J]. Journal of Southwest Jiaotong University, 2022, 57(5): 1130-1136. doi: 10.3969/j.issn.0258-2724.20200393
Citation: CHEN Xiaoyu, TANG Maolin. Main Cable Opening Inspection and Bearing Capacity Evaluation of Suspension Bridge in Service in Myanmar[J]. Journal of Southwest Jiaotong University, 2022, 57(5): 1130-1136. doi: 10.3969/j.issn.0258-2724.20200393

缅甸某悬索桥主缆开缆检测及承载力评估

doi: 10.3969/j.issn.0258-2724.20200393
基金项目: 国家自然科学基金(51478391)
详细信息
    作者简介:

    陈小雨(1986—),女,讲师,研究方向为大跨度桥梁理论与计算,E-mail: 99158675@qq.com

    通讯作者:

    唐茂林(1973—),男,副教授,研究方向为大跨度桥梁理论与计算,E-mail: tmllpl@126.com

  • 中图分类号: U448.25

Main Cable Opening Inspection and Bearing Capacity Evaluation of Suspension Bridge in Service in Myanmar

  • 摘要:

    为研究在役悬索桥主缆的腐蚀状况以及剩余承载力,对缅甸某服役25 a的悬索桥主缆进行开缆检测以及承载力评估. 首先,除去主缆外层防护,用楔子将主缆局部楔开,建立主缆开缆截面腐蚀分布图;其次,将实桥主缆钢丝分为4个腐蚀阶段,从缆内截取各阶段的样本钢丝进行实验分析;最后,采用简化模型对主缆剩余承载力进行评估. 研究结果表明:钢丝沿主缆径向由外向内腐蚀程度依次降低,最外层钢丝发生严重的基体腐蚀,样本钢丝腐蚀斑随腐蚀程度加深而尺寸逐渐扩大,钢丝强度和延展性随腐蚀程度加深而降低约3.50%和9.00%,上下游主缆强度降低约5.7%.

     

  • 图 1  主缆检测现场照片

    Figure 1.  Photos of main cable inspection

    图 2  4个腐蚀阶段钢丝外观对比

    Figure 2.  Comparison of steel wire appearances in four corrosion stages

    图 3  上、下游主缆跨中截面钢丝腐蚀分布

    Figure 3.  Corrosion distribution of steel wire at midspan of upstream and downstream main cable

    图 4  各腐蚀阶段样本钢丝腐蚀斑发展

    Figure 4.  Development of corrosion spots ofsample steel wire in each corrosion stage

    图 5  腐蚀斑长度变化散点图

    Figure 5.  Scatter diagram of corrosion spot length changing with corrosion level

    图 6  钢丝横截面锈层3D共聚焦显微镜图

    Figure 6.  3D confocal micrograph of rust layer on steel wire cross-section

    图 7  各腐蚀阶段样本钢丝应力-伸长率曲线

    Figure 7.  Stress-strain curves of sample steel wires in various corrosion stages

    表  1  液体成分测量结果表

    Table  1.   Results of liquid composition measurements

    测量液体pH 值 (25 ℃)Cl/(mg•kg−1)${\rm{SO}}_4^{2 - }$/(mg•kg−1)
    样本浸泡液7.264.09911.2880
    雨水样品8.282.072126.1308
    下载: 导出CSV

    表  2  样本钢丝拉伸性能测量结果表

    Table  2.   Test results of tensile properties ofsample steel wires

    腐蚀
    阶段
    屈服力/
    KN
    屈服强度/MPa破断力/
    KN
    抗拉强度/MPa弹性模量/GPa延伸率/%
    阶段 1 30.15 1419.15 34.95 1646.22 204 4.41
    阶段 2 30.11 1417.37 34.26 1613.93 205 4.36
    阶段 3 30.08 1415.54 34.14 1608.25 211 4.16
    阶段 4 29.56 1391.47 33.71 1587.87 208 4.01
    下载: 导出CSV

    表  3  断面收缩率

    Table  3.   Percentage reduction ofcross-section area after fracture

    腐蚀
    阶段
    断前直径
    (均值)/mm
    断后直径
    (均值)/mm
    断面收缩率
    (均值)/%
    阶段 1 5.19 4.40 15.2
    阶段 2 5.20 4.60 11.5
    阶段 3 5.17 4.81 6.9
    阶段 4 5.14 4.89 4.8
    下载: 导出CSV

    表  4  上游跨中截面数据统计表

    Table  4.   Statistics of parameters of upstream midspan section

    截面含量组别$ {N_k} $/根${\mu _{{\rm{s}}k} }$/MPa${\sigma _{{\rm{s}}k} }$/MPa${P_{{\rm{u}}k} }$/%
    上游第 1 组39271630.0728.4683.6
    第 2 组3381608.2525.627.2
    第 3 组4341587.8747.899.2
    下游第 1 组37961630.0728.4680.8
    第 2 组4421608.2525.629.4
    第 3 组4611587.8747.899.8
    下载: 导出CSV
  • [1] 陈小雨,沈锐利,唐茂林. 悬索桥主缆检测及承载力评估现状与发展[J]. 重庆交通大学学报(自然科学版),2013(增刊1): 760-763.

    CHEN Xiaoyu, SHEN Ruili, TANG Maolin. Current situation and development for detection and bearing capacity evaluation of main cable of suspension bridge[J]. Journal of Chongqing Jiaotong University(Natural Science), 2013(S1): 760-763.
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    [3] COLFORD B R, CLARK C A. Forth road bridge main cables:replacement/augmentation study[J]. Bridge Engineering, 2010, 163(2): 79-89.
    [4] 沈平. 英国M48塞文桥主缆检查与修复[J]. 世界桥梁,2011(5): 70-73.
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    [7] 辛付开, 韩依璇, 张国荣, 等. 某在役悬索桥平行钢丝主缆检查及腐蚀规律研究[J] 水利与建筑工程学报, 2017, 15(3): 118-122.

    XIN Fukai, HAN Yixuan, ZHANG Guorong, et al. Inspection and corrosion rule of parallel steel wire main cables of suspension bridge in service[J]. Journal of Water Resources and Architectural Engineering, 2017, 15(3): 118-122.
    [8] 陈小雨,唐茂林. 温度和湿度环境下未镀锌高强钢丝的腐蚀速率谱[J]. 西南交通大学学报,2018,53(2): 253-259. doi: 10.3969/j.issn.0258-2724.2018.02.005

    CHENG Xiaoyu, TANG Maolin. Corrosion rate of non-galvanized high-strength steel wires under different temperature and humidity conditions[J]. Journal of Southwest Jiaotong University, 2018, 53(2): 253-259. doi: 10.3969/j.issn.0258-2724.2018.02.005
    [9] 陈小雨,唐茂林. 悬索桥主缆镀锌钢丝腐蚀过程及抗力变化试验研究[J]. 桥梁建设,2018,48(1): 60-64. doi: 10.3969/j.issn.1003-4722.2018.01.011

    CHENG Xiaoyu, TANG Maolin. Experimental study of corrosion process and resisitance changes of galvanized steel wires for main cable of suspension bridge[J]. Bridge Construction, 2018, 48(1): 60-64. doi: 10.3969/j.issn.1003-4722.2018.01.011
    [10] 陈小雨,唐茂林. 悬索桥主缆钢丝腐蚀速率计算方法[J]. 公路交通科技,2019,36(2): 43-49.

    CHEN Xiaoyu, TANG Maolin. A method for calculating corrosion rate of main cable steel wires of suspension bridge[J]. Journal of Highway and Transportation Research and Development, 2019, 36(2): 43-49.
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出版历程
  • 收稿日期:  2020-06-17
  • 修回日期:  2020-10-19
  • 刊出日期:  2020-10-21

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