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Experimental study on high pre-cracked RC beams shear-strengthened with CFRP strips

机译：CFRP板条剪切加固高强预裂RC梁的试验研究。

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摘要

Experimental studies on shear capacity of eighteen pre-cracked reinforced concrete (RC) beams shear-strengthened with carbon fiber reinforced polymer (CFRP) strips are carried out in this study. The effects of CFRP strips spacing, shear span ratio and pre-cracked degree on the failure mode, shear capacity, load-deflection curve and moment-curvature relationship of strengthened specimens are analyzed. Three failure modes related to the failure of CFRP strips, that is the bonding failure, the debond failure and the fracture failure of CFRP strips, are observed for specimens with different structural parameters. Moreover, with decrease of CFRP strips spacing, the shear capacity, the ultimate deflection and the bending stiffness of specimens increase. With increase of pre-cracked degree, the increment of shear capacity of RC beams shear-strengthened with CFRP strips is lower than that of non-cracked beams. The pre-cracked degree presents slight effect on the stiffness of CFRP strips-strengthened beams. Further, a revised model to determine the shear capacity of CFRP strips is proposed by accounting for the strain distribution of CFRP strips and the pre-cracked degree. Comparison between the experimental results and the calculated values indicates that the proposed formula can versatilely evaluate the shear capacity of CFRP strips strengthened RC beams.
机译：这项研究进行了十八个预裂钢筋混凝土（RC）梁用碳纤维增强聚合物（CFRP）条抗剪加固的抗剪试验。分析了碳纤维增强塑料条的间距，剪切跨度比和预裂纹度对加固试件的破坏模式，抗剪承载力，荷载挠度曲线和弯矩曲率关系的影响。对于具有不同结构参数的试件，观察到了三种与CFRP条破坏有关的破坏模式，即CFRP条的粘结破坏，脱粘破坏和断裂破坏。而且，随着CFRP条带间距的减小，试样的剪切能力，极限挠度和弯曲刚度都会增加。随着预裂度的增加，用CFRP筋抗剪加固的RC梁的抗剪承载力的增长幅度要小于未开裂的梁。预开裂度对CFRP加固梁的刚度影响不大。此外，通过考虑CFRP板条的应变分布和预开裂程度，提出了确定CFRP板条的剪切能力的修正模型。实验结果与计算值的比较表明，所提出的公式可以广泛地评估CFRP加固RC梁的抗剪承载力。

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  • 来源
    《Composite Structures》 |2019年第10期|111163.1-111163.14|共14页
  • 作者

    Yu Feng; Guo Shengquan; Wang Shilong; Fang Yuan;

  • 作者单位

    Anhui Univ Technol, Dept Civil Engn & Architecture, Maanshan 243002, Peoples R China;

    Anhui Univ Technol, Dept Civil Engn & Architecture, Maanshan 243002, Peoples R China;

    Anhui Univ Technol, Dept Civil Engn & Architecture, Maanshan 243002, Peoples R China;

    Anhui Univ Technol, Dept Civil Engn & Architecture, Maanshan 243002, Peoples R China;

  • 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; Concrete beams; Reinforcement; Shear capacity; Shear span ratio; Pre-cracked degree;

    机译：CFRP;混凝土梁;加固;剪切能力;剪切阵列比率;预破解程度;

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