轴偏转角对吊索腐蚀钢丝力学性能影响研究  

Effect of Axis Deflection Angle on Mechanical Properties of Corroded Steel Wire for Slings

作　　者：谢清清 邓年春[1,2] Xie Qingqing;Deng Nianchun(School of Civil and Engineering and Architecture,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Disaster Risk Reduction and Engineering Safety,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西大学广西防灾减灾与工程安全重点实验室,广西南宁530004

出　　处：《华东交通大学学报》2023年第4期103-111,共9页Journal of East China Jiaotong University

基　　金：国家自然科学基金项目(51868006)。

摘　　要：拱桥吊索在长时间服役下会产生轴偏转现象,为研究这一现象对吊索产生的受力影响,针对吊索基本单元钢丝设计一套轴偏转静力张拉试验方案。首先利用铜盐加速腐蚀法制备腐蚀钢丝试件,对试件进行4个不同轴偏转角(0,10,20,30 mrad)的静力张拉试验,并利用Ansys对试验和蚀坑进行数值模拟。研究结果表明:钢丝的质量失重率和平均腐蚀深度随腐蚀时间呈线性增大,而腐蚀速率却随腐蚀时间呈二次曲线减小;钢丝极限抗拉性能随偏转角的增大而减小;偏转角-腐蚀耦合情况下会加速削弱钢丝的抗拉强度;数值模拟与试验相符合,有效验证了试验得到的规律;钢丝存在蚀坑会产生集中应力现象,应力最大值随偏转角增大而增大。Slings of arch bridges may experience axial deflection after long-term service.In order to study the influence of this phenomenon on the force of the slings,this paper designs a static tensile test scheme of axial deflection for the basic unit of the slings.Firstly,the corroded steel wire specimens were prepared by accelerated copper salt corrosion method,and the static tensile tests were carried out on the specimens at four different coaxial deflection angles(0,10,20 mrad and 30 mrad).Ansys is used to simulate the test and the pitting.The results show that the weight loss rate and the average corrosion depth of steel wire increase linearly with the corrosion time,but the corrosion rate decreases quadratically with the corrosion time.The ultimate tensile properties of steel wire decrease with the increase of deflection angle.The coupling of deflection angle and corrosion accelerate the weakening of the tensile strength of steel wire.The numerical simulation is in good agreement with the experiment,which effectively verifies the law obtained by the experiment.The phenomenon of concentrated stress occurs when there are pits in steel wire,and the maximum stress increases with the increase of deflection angle.

关 键 词：偏转角 吊索 钢丝 腐蚀 破断应力 

分 类 号：U24[交通运输工程—道路与铁道工程] TH142.2[一般工业技术—材料科学与工程]