基于自发漏磁效应的钢绞线应力检测试验研究

doi:10.3969/j.issn.1674-0696.2022.03.09

重庆交通大学学报（自然科学版） ›› 2022, Vol. 41 ›› Issue (03): 58-64.DOI: 10.3969/j.issn.1674-0696.2022.03.09

基于自发漏磁效应的钢绞线应力检测试验研究

刘尚凯1，周建庭1，张向和2，赵瑞强3，张潇汀1

(1. 重庆交通大学土木工程学院，重庆 400074； 2. 重庆市市政设施管理局，重庆 400015； 3. 重庆交通大学材料科学与工程学院，重庆 400074)

收稿日期:2020-09-14 修回日期:2020-11-28 发布日期:2022-03-24
作者简介:刘尚凯（1995—），男，重庆人，博士研究生，主要从事桥梁健康监测和无损检测方面的研究。E-mail：709278983@qq.com 通信作者：赵瑞强（1983—），男，河北邯郸人，副教授，博士，主要从事材料无损检测方面的研究。E-mail：rqzhao@cqjtu.edu.cn
基金资助:
国家自然科学基金项目(U20A20314，51808082)；重庆市自然科学基金创新群体科学基金项目（cstc2019jcyj-cxttX0004）；重庆市技术创新与应用发展专项重点项目（cstc2019jscx-gksbX0047）；重庆交通大学研究生科研创新项目（2020S0010）

Experimental Study on Stress Detection of Steel Strand Based on Self-magnetic Flux Leakage Effect

LIU Shangkai1,ZHOU Jianting1,ZHANG Xianghe2,ZHAO Ruiqiang3,ZHANG Xiaoting1

(1. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China; 2. Chongqing Municipal Facilities Administration, Chongqing 400015, China; 3. School of Material Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China)

Received:2020-09-14 Revised:2020-11-28 Published:2022-03-24

摘要/Abstract

摘要： 为实现基于自发漏磁效应的钢绞线应力检测，对1 860级钢绞线进行了张拉试验，研究其表面漏磁场强度随所受拉应力的变化规律，初步建立了基于自发漏磁效应的钢绞线受力大小分级标准,同时探究了试件长度和提离高度对漏磁场强度的影响。结果表明：漏磁强度法向分量By与拉力值F正相关,By-F曲线存在“两侧陡，中间平缓”的现象，其梯度在加载过程中发生明显变化；漏磁场法向分量的梯度曲线Ky-F存在两个转折点，由此将钢绞线拉伸过程的应力分为0～31.24%、31.24%～71.79%、71.79%～100%极限承载力3个区间，通过测量Ky-F曲线的变化趋势，可判断出钢绞线某一时刻应力值所处区间。随着提离高度的增大，加载过程中漏磁场强度的变化范围减小；随着试件长度增大，By-F曲线的变化率趋于稳定。

关键词: 桥梁工程; 钢绞线；应力检测；自发漏磁；张拉试验

Abstract: In order to realize the stress detection of steel strand based on self-magnetic flux leakage (SMFL) effect, the tension test of 1 860 grade steel strand was carried out. The variation law of surface magnetic flux leakage intensity changing with the tensile stress was studied. The grading standard of steel strand stress based on SMFL effect was initially established. Meanwhile, the influence of specimen length and lift-off height on magnetic flux leakage intensity was also explored. The results show that the normal component By of magnetic flux leakage intensity is positively correlated with the tensile force value F. The By-F curve has a phenomenon of “steep on both sides and gentle in the middle”, and its gradient changes significantly during the loading process; the gradient curve Ky-F of normal component of magnetic flux leakage field has two turning points, which can divide stress value during the stretching process of the steel strand into three intervals: 0～31.24%, 31.24%～71.79%, 71.79%～100% ultimate bearing capacity. By measuring the change trend of the Ky-F curve, the interval of the stress value of the steel strand at a certain moment can be judged. As the lift-off height increases, the variation range of the leakage magnetic field intensity during the loading process decreases; as the length of the specimen increases, the variation rate of the By-F curve tends to be stable.

Key words: bridge engineering; steel strand; stress detection; self-magnetic flux leakage; tensile test

中图分类号:

U446.3

刘尚凯1，周建庭1，张向和2，赵瑞强3，张潇汀1. 基于自发漏磁效应的钢绞线应力检测试验研究[J]. 重庆交通大学学报（自然科学版）, 2022, 41(03): 58-64.

LIU Shangkai1,ZHOU Jianting1,ZHANG Xianghe2,ZHAO Ruiqiang3,ZHANG Xiaoting1. Experimental Study on Stress Detection of Steel Strand Based on Self-magnetic Flux Leakage Effect[J]. Journal of Chongqing Jiaotong University(Natural Science), 2022, 41(03): 58-64.

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基于自发漏磁效应的钢绞线应力检测试验研究

Experimental Study on Stress Detection of Steel Strand Based on Self-magnetic Flux Leakage Effect

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