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Cracking behavior of reinforced concrete beams strengthened with CFRP anchorage system under cyclic and monotonic loading

机译：CFRP锚固加固钢筋混凝土梁在反复荷载下的开裂性能。

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摘要

This paper presents the details of an experimental and analytical study that addresses the influence of carbon fiber-reinforced polymer (CFRP) anchors on the bearing capacity and fatigue behavior of reinforced concrete beams strengthened by CFRP strips. The experimental set comprised seven beams from which four beams strengthened by CFRP strips and anchors of four different lengths were first subjected to cyclic loading, and subsequently loaded until failure under monotonic loading. The remaining three beams were designed to establish the baseline response. The residual bearing capacity, damage degree, cracking behavior and ultrasonic inspection were analyzed. The results showed that the length of CFRP anchors significantly influenced the residual bearing capacity and failure modes of the specimens. A deep anchoring depth may result in a brittle failure of the specimen at the mid-stage of cyclic loading. In addition, based on the good correlation between residual bearing capacity and the fractal dimension of surface cracks of the beams, a novel damage index was proposed. The results also demonstrated that fractal dimension analysis together with ultrasonic inspection could be exploited to assess damage levels when mechanical testing is not available.
机译：本文详细介绍了一项实验和分析研究的详细内容，该研究解决了碳纤维增强聚合物（CFRP）锚对CFRP条增强的钢筋混凝土梁的承载力和疲劳性能的影响。实验装置包括七根梁，其中四根由CFRP筋和四种不同长度的锚钉加固的梁首先受到循环荷载，然后荷载直至单调荷载作用下破坏。其余三个光束用于建立基线响应。分析了残余承载力，损伤程度，开裂行为和超声检查。结果表明，CFRP锚的长度显着影响了标本的残余承载力和破坏模式。深的锚固深度可能导致样品在循环载荷的中期脆性破坏。此外，基于残余承载力与梁表面裂纹的分形维数之间的良好相关性，提出了一种新的损伤指标。结果还表明，在无法进行机械测试时，可以利用分形维数分析和超声检查来评估损伤程度。

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  • 来源
    《Engineering Structures》 |2020年第15期|110222.1-110222.16|共16页
  • 作者

  • 作者单位

    Tongji Univ Civil Engn Coll Dept Hydraul Engn Shanghai Peoples R China;

    Louisiana Tech Univ Dept Engn Mech Ruston LA 71270 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    CFRP; Anchors; Cyclic loading; Beams; Cracks; Fractal dimension; Ultrasonic detection;

    机译：CFRP;锚;循环加载;梁;裂缝;分形维数超声波检测;

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