中文核心期刊
CSCD来源期刊
中国科技核心期刊
RCCSE中国核心学术期刊

Journal of Chongqing Jiaotong University(Natural Science) ›› 2018, Vol. 37 ›› Issue (12): 11-17.DOI: 10.3969/j.issn.1674-0696.2018.12.02

• Bridge & Tunnel Engineering • Previous Articles     Next Articles

Mechanical Properties Degradation of Corroded Main Cable Wires of Suspension Bridge

HAN Yixuan1, 2, XIN Fukai3, ZHANG Guorong1, 2, ZHU Xiaowen1, 2   

  1. (1. Jiangsu Transportation Research Institute Co. Ltd., Nanjing 211112, Jiangsu, P. R. China; 2. The State Key Laboratory on Safety and Health of In-Service Long-Span Bridges, Nanjing 211112, Jiangsu, P. R. China; 3. School of Mechanics and Materials, Hohai University, Nanjing 210098, Jiangsu, P. R. China)
  • Received:2017-11-06 Revised:2018-02-04 Online:2018-12-09 Published:2020-07-10

悬索桥锈蚀主缆钢丝力学性能退化研究

韩依璇1, 2,辛付开3,张国荣1,2,朱晓文1,2   

  1. (1. 苏交科集团股份有限公司,江苏 南京 211112; 2. 在役长大桥梁安全与健康国家重点实验室,江苏 南京 211112; 3. 河海大学 力学与材料学院,江苏 南京 210098)
  • 作者简介:韩依璇(1980—),女,江苏南京人,高级工程师,博士,主要从事桥梁结构及耐久性能方面的研究。E-mail: hyx96@jsti.com。 通信作者:辛付开(1989—),男,山东聊城人,硕士研究生,主要从事桥梁养护方面的研究。E-mail: xinfukai@126.com。

Abstract: To study the mechanical degradation state of the corroded main cable wires of suspension bridge, the high-tensile wires from main cables with 18-year service life were employed and the complete main cable that intercepted from the suspension bridge was inspected. The corrosion degree evaluation index of loss rate of the minimum sectional area was proposed. The degradation rule of mechanical properties of the corroded main cable wires was studied and the degradation model of corroded steel wires was established, according to the tensile test and fracture surface analysis of corroded steel wire in service. The experiment results show that the corrosion has little effect on the elastic modulus of the steel wires. However, the increase of corrosion degree will lead to a significant decrease in elongation and ultimate strain of steel wire; meanwhile, it will also reduce the ultimate strength and yield strength. Based on the test results, the constitutive relation model for the corroded steel wires with the loss rate of the minimum cross-sectional area less than 10% was established, which provided the basis for evaluating the mechanical properties and residual strength of main cable steel wires.

Key words: bridge engineering, main cable, high tensile wire, mechanical property, tensile test, ductility, constitutive relation

摘要: 为研究悬索桥锈蚀主缆钢丝的力学性能退化状态,以运营使用18年的高强钢丝为对象,通过对从悬索桥截取的完整主缆进行检查,提出了最小截面积损失 率的锈蚀程度评价指标。根据对服役锈蚀钢丝拉伸试验及破坏断口形貌分析,研究了锈蚀主缆钢丝的力学性能退化规律,建立了锈蚀钢丝退化模型。试验结果表 明:锈蚀对钢丝弹性模量基本没有影响,但是锈蚀程度的增大会引起钢丝的延伸率和极限应变大幅度下降,同时也造成极限强度和屈服强度的降低。基于试验结 果建立了最小截面积损失率小于10%的锈蚀钢丝本构关系模型,为主缆钢丝力学性能和剩余强度评估提供依据。

关键词: 桥梁工程, 主缆, 高强钢丝, 力学性能, 拉伸试验, 延性, 本构关系

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