锈蚀高强钢丝力学性能退化的试验研究  

EXPERIMENTAL STUDY ON DEGRADATION OF MECHANICAL PROPERTIES OF CORRODED HIGH STRENGTH STEEL WIRE

作　　者：龚帆 齐盛珂 邹易清 林才奎 王琛[1,2] 周海俊[1,2] GONG Fan;QI Sheng-ke;ZOU Yi-qing;LIN Cai-kui;WANG Chen;ZHOU Hai-jun(Institute of Urban Smart Transportation&Safety Maintenance,Shenzhen University,Shenzhen,Guangdong 518060,China;Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering.Shenzhen University,Shenzhen,Guangdong 518060,China;Liuzhou OVM Machinery Co.,Ltd.,Liuzhou,Guangxi 545006,China;Poly Changda Engineering Co.,Ltd.,Guangzhou,Guangdong 510620,China)

机构地区：[1]深圳大学城市智慧交通与安全运维研究院,广东深圳518060 [2]深圳大学广东省滨海土木工程耐久性重点试验室,广东深圳518060 [3]柳州欧维姆机械股份有限公司,广西柳州545006 [4]保利长大工程有限公司,广东广州510620

出　　处：《工程力学》2020年第10期105-115,共11页Engineering Mechanics

基　　金：国家自然科学基金面上项目(腐蚀高强钢丝及拉索承载性能退化的概率评估)(51778372);深圳市基础研究计划项目(深圳地区缆索承重桥梁拉索构件承载能力的退化规律研究)(JCYJ20170818102511790)。

摘　　要：该文通过试验研究了锈蚀高强钢丝的锈蚀形貌、产物、力学性能,为其检测评估提供依据。用高分辨率X射线衍射仪和场发射环境扫描电镜分析高强钢丝锈蚀产物,用华朗-3DX+非接触式三维扫描仪确定其截面特性沿钢丝轴向的变化情况,还采用MTS试验机对其进行静力拉伸和疲劳加载试验。通过分析三维扫描数据确定锈蚀高强钢丝表面形貌,基于实测锈蚀高强钢丝力学性能建立本构关系模型参数与锈蚀率的退化关系。试验结果表明:高强钢丝锈蚀截面面积的变异性随锈蚀程度增加越来越显著;极限强度在锈蚀率大于1.25%时小于标准极限强度1770 MPa;断后伸长率在锈蚀率大于5.05%时小于规范限值4%;疲劳寿命在锈蚀率大于4.16%时小于200万次;锈蚀率对高强钢丝弹性模量无明显影响。根据试验结果综合完善了现有规范对锈蚀高强钢丝等级划分的指标值。The morphology,product and degradation of corroded high strength steel wire were tested,which was essential for inspection and mechanical evaluation.The corrosion products were analyzed by high resolution Xray diffractometer and environmental scanning electron microscope.Three-dimensional scanning was applied to determine the change of the cross section of corroded wire along the axial direction.Static tensile and fatigue loading tests were also carried out.The corrosion morphology of high strength steel wire is determined by the analysis of 3D scanning data.The degradation of the constitutive model parameters of corroded high strength wires are derived by the regression analysis of the test mechanical parameters and corresponding corrosion ratios.The test results show that:the variability of sectional area along wire axis increases with the increase of corrosion degree,the ultimate strength of corroded wire is less than the standard strength of 1770 MPa when corrosion ratio is more than 1.25%;the elongation is less than the specification limit of 4%when the corrosion ratio is greater than 5.05%;the fatigue life is less than 2 million cycles when the corrosion ratio is more than 4.16%;while corrosion has little effects on the elastic modulus.The index for evaluation of corroded wire is refined for the specification based on the above results.

关 键 词：桥梁与隧道工程 高强钢丝 力学性能退化 盐雾锈蚀 三维扫描 

分 类 号：U444[建筑科学—桥梁与隧道工程] TU502.6[交通运输工程—道路与铁道工程]