缅甸某悬索桥主缆开缆检测及承载力评估

陈小雨; 唐茂林

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

陈小雨^{1, 2,},
唐茂林^3, ,

1.
西华大学土木建筑与环境学院，四川成都 611756
2.
成都纺织高等专科学校智能建造与环境工程学院，四川成都 611731
3.
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（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
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- 被引次数: 0
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

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

CHEN Xiaoyu^{1, 2
,},
TANG Maolin^{3
, ,}

1.
School of Civil Architecture and Environment, Xihua University, Chengdu 611756, China
2.
School of Intelligent Construction and Environmental Engineering, Chengdu Textile College, Chengdu 611731, China
3.
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

摘要

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%.
- 悬索桥主缆检测 /
- 平行钢丝腐蚀 /
- 承载力评估
Abstract:
A cable opening inspection was made on a suspension bridge in service for 25 years in Myanmar to analyze the corrosion status and residual bearing capacity of the main cables. First, the outer protection layer of the main cable was removed; the main cable is partially split with wedge for detection, and the corrosion distribution diagram of the main cable cross-section was established. Then, the main cable steel wire of the bridge was divided into four corrosion stages, and samples of each stage were taken from the cable for laboratory analysis. Finally, a simplified model was used to evaluate the residual bearing capacity of the main cable. The results showed that the corrosion degree of the steel wires decreased from outside to inside along the radial direction of the main cable, and the outermost steel wire had serious matrix corrosion. As the corrosion level increased, the corrosion spot size of the sample steel wires expanded gradually, the strength and ductility of the steel wires decreased by about 3.50% and 9.00%, respectively, and the average tensile strength of the upstream and downstream main cables decreased by about 5.7%.
- main cable inspection /
- steel wire corrosion /
- bearing capacity evaluation

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图 1 主缆检测现场照片

Figure 1. Photos of main cable inspection

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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

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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

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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

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图 5 腐蚀斑长度变化散点图

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

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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

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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

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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	7.26	4.0991	1.2880
雨水样品	8.28	2.0721	26.1308

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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

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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

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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	3927	1630.07	28.46	83.6
	第 2 组	338	1608.25	25.62	7.2
	第 3 组	434	1587.87	47.89	9.2
下游	第 1 组	3796	1630.07	28.46	80.8
	第 2 组	442	1608.25	25.62	9.4
	第 3 组	461	1587.87	47.89	9.8

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参考文献(10)

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