Research on quantitative detection method of internal rebar stresses in RC beams under cyclic loading based on force-magnetic coupling optimization model

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-10-08 DOI:10.1016/j.conbuildmat.2025.143930

Hong Zhang , Kai Tong , Yujie Zhang , Yinghao Qu , Jianting Zhou

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引用次数: 0

Abstract

To achieve non-destructive quantitative diagnosis of steel stress inside the structure, a bending loading experiment was conducted on RC beams under cyclic loading. The normal and tangential magnetic field parameters C_σx and C_σy are introduced. The evolution pattern of the force-magnetic coupling relationship is investigated. Research results: The correlation between dislocations in the microstructure of steel bar and magnetic domain displacement has been clarified. An optimized model of the force-magnetic relationship under cyclic loading has been established, precisely describing the variation characteristics of magnetization intensity with stress strength. The increase in cyclic loading promotes the stable development of the magnetic induction intensity B_x and B_y curves. The magnetic intensity of the steel bar exhibits asynchronous variation with stress intensity, leading to an inverted characteristic change in the magnetic field curves. The parameter C_σy corresponds to the stress level of the steel bar. The parameter C_σx exhibits a linear positive correlation with the rebar stress. Accordingly, stage-based diagnostic criteria and quantitative relationships for stress are proposed. A comprehensive method for quantifying the stress state of steel bars based on two-dimensional eigenvalues has been established.

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基于磁力耦合优化模型的循环荷载作用下RC梁内筋应力定量检测方法研究

为了实现结构内部钢应力的无损定量诊断，对循环荷载作用下的RC梁进行了弯曲加载试验。介绍了法向和切向磁场参数Cσx和Cσy。研究了力-磁耦合关系的演化规律。研究结果：明确了钢筋微观组织位错与磁畴位移之间的关系。建立了循环加载下的力磁关系优化模型，准确描述了磁化强度随应力强度的变化特征。循环载荷的增加促进了磁感应强度Bx和By曲线的稳定发展。钢筋的磁场强度随应力强度呈非同步变化，导致磁场曲线呈倒向特征变化。参数Cσy对应钢筋的应力水平。参数Cσx与钢筋应力呈线性正相关。据此，提出了基于阶段的应力诊断标准和定量关系。建立了一种基于二维特征值的钢筋应力状态综合量化方法。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.