SMFL Signal Analysis of Steel Bar Tensile Failure Test
under Repeated Load

doi:10.3969/j.issn.1674-0696.2022.02.09

Abstract

Abstract: In order to study the change rule of the rebar self-magnetic-flux-leakage (SMFL) signal under the repeated load, a modified Jiles-Atherton model was proposed based on the consideration of the internal friction effect of the repeated load. The influence of repeated load on the law of SMFL signal was studied through the monitoring experiment of steel bar SMFL signal in tensile process. The results show that after repeated loading and unloading, the initial SMFL signal will lose, but eventually tends to 0, and the relationship between SMFL signal and force tends to be stable. The SMFL curves in the elastic phase are affected by the maximum value of repeated loads (Fc), and the variation law and boundary characteristics of SMFL signal in yield stage, strengthening stage and necking stage are not affected. The first and second peaks of the SMFL corresponding to the first derivative can effectively determine the current stress state of the steel bar.

Key words: bridge engineering; repeated load; steel bar; tensile failure; SMFL; stress monitoring

摘要： 为研究钢筋在反复荷载下自发漏磁(SMFL)信号的变化规律，在考虑反复荷载对磁化强度的内耗效应基础上，提出了修正后的Jiles-Atherton模型；通过对拉伸过程钢筋SMFL信号监测实验，研究了反复荷载对SMFL信号规律的影响。研究结果表明：在经过反复加卸载后初始SMFL信号会产生损耗但最终趋于0，SMFL信号与力的关系逐渐趋于稳定；弹性阶段SMFL信号曲线规律受反复荷载最大值Fc影响，屈服阶段、强化阶段和颈缩阶段SMFL信号变化规律与界限特征不受影响；SMFL信号对应变一阶导数的第1、2峰值可有效地确定钢筋目前所处应力状态。

关键词: 桥梁工程；反复荷载；钢筋；拉伸破坏；SMFL；应力监测

CLC Number:

U446.3

QU Yinghao1, ZHOU Jianting1, ZHAO Ruiqiang2, ZHANG Hong1, LIU Shangkai1. SMFL Signal Analysis of Steel Bar Tensile Failure Test under Repeated Load[J]. Journal of Chongqing Jiaotong University(Natural Science), 2022, 41(02): 58-64.

屈英豪1，周建庭1，赵瑞强2，张洪1，刘尚凯1. 反复荷载下钢筋拉伸破坏试验的自发漏磁信号分析[J]. 重庆交通大学学报（自然科学版）, 2022, 41(02): 58-64.

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SMFL Signal Analysis of Steel Bar Tensile Failure Test under Repeated Load

反复荷载下钢筋拉伸破坏试验的自发漏磁信号分析

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