A Novel SMFL-Based Assessment Method for Corrosion Nonuniformity of Rebar and Its Application in Reliability Analysis of Corroded RC Beam

IF 4.6 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Structural Control & Health Monitoring Pub Date : 2024-03-13 DOI:10.1155/2024/9988034
Junli Qiu, Yue Jing, Weiping Zhang, Chao Jiang
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Abstract

The reliability of corroded reinforced concrete (RC) structures relies on the accurate minimum cross-sectional area of corroded rebar. In this study, the accurate morphologies and self-magnetic flux leakage (SMFL) field strengths of twenty-eight non-uniformly corroded rebars were obtained using 3D structural light scanning and micromagnetic detection technologies, based on which three indices of the SMFL field variation ratio dH, the corrosion non-uniformity degree dSn, and the cross-sectional area ratio K0.25 are proposed. The statistical results show that the probability densities of dSn and K0.25 obey the Weibull distribution and Gamma distribution at the 95% confidence level, respectively, and their distribution parameters are linearly or inversely proportional to dH. The probability density distribution of the minimum cross-sectional area of corroded rebar can be determined using indices dSn and K0.25, based on which a feasible SMFL-based reliability assessment method of corroded RC structures is proposed. The case study of a real specific corroded RC beam shows that the reliability assessment error of the SMFL-based method is only 1.2%, which is much lower than the 20.7% error of the existing method. This SMFL-based method provides a novel idea that can automatically and accurately assess the effect of rebars’ corrosion non-uniformity on the reliability of specific in-serviceRC structures.

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基于 SMFL 的新型钢筋腐蚀不均匀性评估方法及其在受腐蚀 RC 梁可靠性分析中的应用
锈蚀钢筋混凝土(RC)结构的可靠性取决于锈蚀钢筋最小截面积的准确性。本研究利用三维结构光扫描和微磁检测技术获得了 28 根非均匀锈蚀钢筋的精确形态和自磁通量泄漏(SMFL)场强,在此基础上提出了 SMFL 场强变化率 dH、锈蚀不均匀度 dSn 和截面积比 K0.25 三个指标。统计结果表明,在 95% 置信度下,dSn 和 K0.25 的概率密度分别服从 Weibull 分布和 Gamma 分布,其分布参数与 dH 成线性或反比例关系。利用指数 dSn 和 K0.25 可以确定锈蚀钢筋最小截面积的概率密度分布,并在此基础上提出了一种可行的基于 SMFL 的锈蚀钢筋结构可靠性评估方法。通过对实际具体锈蚀钢筋混凝土梁的案例研究表明,基于 SMFL 的方法的可靠性评估误差仅为 1.2%,远低于现有方法 20.7% 的误差。这种基于 SMFL 的方法提供了一种新的思路,可以自动、准确地评估钢筋锈蚀不均匀性对特定在役 RC 结构可靠性的影响。
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来源期刊
Structural Control & Health Monitoring
Structural Control & Health Monitoring 工程技术-工程:土木
CiteScore
9.50
自引率
13.00%
发文量
234
审稿时长
8 months
期刊介绍: The Journal Structural Control and Health Monitoring encompasses all theoretical and technological aspects of structural control, structural health monitoring theory and smart materials and structures. The journal focuses on aerospace, civil, infrastructure and mechanical engineering applications. Original contributions based on analytical, computational and experimental methods are solicited in three main areas: monitoring, control, and smart materials and structures, covering subjects such as system identification, health monitoring, health diagnostics, multi-functional materials, signal processing, sensor technology, passive, active and semi active control schemes and implementations, shape memory alloys, piezoelectrics and mechatronics. Also of interest are actuator design, dynamic systems, dynamic stability, artificial intelligence tools, data acquisition, wireless communications, measurements, MEMS/NEMS sensors for local damage detection, optical fibre sensors for health monitoring, remote control of monitoring systems, sensor-logger combinations for mobile applications, corrosion sensors, scour indicators and experimental techniques.
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