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Comparative study on prestress loss and flexural performance of rectangular and T beam strengthened by prestressing CFRP plate

机译：预应力CFRP板加固矩形和T光束预应力损耗和弯曲性能的比较研究

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摘要

Influence of real and small size (laboratory) specimens with different prestress levels on the flexural performance of RC beam has not yet been compared to verify the reliability of experimental research for real applications. In this study, an experiment was designed by casting rectangular (small-scale) and T-section (largescale) RC beams, which were strengthened by CFRP plates with 0, 20 and 40% prestress levels. The prestress loss and flexural performance was assessed for both scales. The instantaneous and initial 7-day prestress losses of the small-scale specimens were notably higher than those of the large-scale specimens. Thereafter, a four point bending test was conducted to assess the specimens' flexural performance. The experimental results showed that the cracking, yield and ultimate moments increased with the prestress level, in which the incremental rate of the ultimate moment of the small-scale specimens was obviously greater than the large-scale specimens. The load?deflection curves of the large-scale specimens suddenly dropped with simultaneous CFRP plate debonding from the plate end, while this phenomenon was not obvious during the small-scale specimen tests. This result indicates that the adhesive bonding benefits the stiffness of the real-size strengthened beams, but this was not observed in the small-size specimen tests.
机译：实际和小型（实验室）标本对不同预应力水平对RC光束弯曲性能的影响尚未进行验证真实应用实验研究的可靠性。在本研究中，通过铸造矩形（小规模）和T型（Largescale）RC梁设计了实验，该射频由CFRP平板加强，预应力水平为0,20％和40％。对两种尺度评估预应力损失和抗弯性能。小规模标本的瞬时和最初的7天预应力损失明显高于大规模标本。此后，进行了四点弯曲试验以评估样品的抗弯性能。实验结果表明，随着预应力水平，裂缝，产量和最终时刻增加，其中小规模标本的最终时刻的增量率明显大于大规模标本。负载？大规模标本的偏转曲线突然用板端的同时CFRP板脱落，而这种现象在小规模标本试验期间并不明显。该结果表明，粘合剂粘合有利于实尺寸加强梁的刚度，但在小尺寸的样品试验中未观察到这一点。

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  • 来源
    《Composite Structures》 |2021年第4期|113340.1-113340.13|共13页
  • 作者

    Deng Jun; Rashid Khuram; Li Xiaoda; Xie Yan; Chen Sigui;

  • 作者单位

    Guangzhou Univ Sch Civil Engn Guangzhou Peoples R China|Guangdong Univ Technol Sch Civil & Transportat Engn Guangzhou Peoples R China;

    Univ Engn & Technol Dept Architectural Engn & Design Lahore Pakistan|Guangdong Univ Technol Sch Civil & Transportat Engn Guangzhou Peoples R China;

    Guangdong Univ Technol Sch Civil & Transportat Engn Guangzhou Peoples R China;

    Guangdong Univ Technol Sch Civil & Transportat Engn Guangzhou Peoples R China;

    Guangdong Univ Technol Sch Civil & Transportat Engn Guangzhou 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

    RC beam; CFRP strengthening; Impact of scale; Prestress losses; Flexural performance;

    机译：RC梁;CFRP加强;规模的影响;预应力损失;弯曲性能;

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