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。
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 uhimate strain of steel wite; meanwhile, it will also reduce the uhimate 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.
作者
韩依璇
辛付开
张国荣
朱晓文
HAN Yixuan;XIN Fukai;ZHANG Ouorong;ZHU Xiaowen(Jiangsu Transportation Research Institute Co.Ltd.,Nanjing 211112,Jiangsu,P.R.China;The State Key Laboratory on Safety and Health of In Service Long Span Bridges,Nanjing 211112,Jiangsu,P.R.China;School of Mechanics and Materials,Hohai University,Nanjing 210098,Jiangsu,P.R.China)
出处
《重庆交通大学学报（自然科学版）》
CAS
北大核心
2018年第12期11-17,共7页
Journal of Chongqing Jiaotong University(Natural Science)
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
bridge engineering
main cable
high tensile wite
mechanical property
tensile test
duetility
constitutive relation
