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首页> 外文期刊>Magazine of Concrete Research >Flexural behaviour of RC beams strengthened with combinations of two CFRP systems and P-SWRs
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Flexural behaviour of RC beams strengthened with combinations of two CFRP systems and P-SWRs

机译：两种CFRP系统和P-SWR的组合可增强RC梁的抗弯性能

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摘要

Externally bonded (EB) carbon fibre-reinforced polymer (CFRP) sheets, near-surface-mounted (NSM) CFRP bars and prestressed steel wire ropes (P-SWRs) are widely used for strengthening reinforced-concrete (RC) beams. Existing research has shown that it can be inefficient or infeasible to provide sufficient load-carrying capacity using one strengthening method because of the CFRP strain limitation at debonding or the upper bound on the amount of strengthening materials due to limited space for strengthening. Moreover, some already strengthened RC beams need to be further strengthened under heavier loading conditions. Therefore, using a combined strengthening scheme for one beam should be considered in both these situations. In this study, five concrete beams were strengthened and tested to explore the effects of different combined schemes on beam flexural behaviour. The results demonstrate that P-SWRs are of crucial importance in improving the cracking behaviour and ductility of beams originally strengthened with EB-CFRP sheets or NSM-CFRP bars. The strengthening scheme of NSM-CFRP bars and P-SWRs is found to be better than that of EB-CFRP sheets and P-SWRs. A recommendation for the appropriate selection of strengthening schemes is given based on the test results.
机译：外部粘结（EB）碳纤维增强聚合物（CFRP）板，近表面安装（NSM）CFRP筋和预应力钢丝绳（P-SWR）被广泛用于增强钢筋混凝土（RC）梁。现有研究表明，由于一种碳纤维增强材料在剥离时的局限性或由于增强空间有限而导致的增强材料数量上限，使用一种增强方法来提供足够的承载能力可能是低效或不可行的。此外，在重载条件下，一些已经加固的钢筋混凝土梁需要进一步加固。因此，在这两种情况下都应考虑对一个梁使用组合加固方案。在这项研究中，对五根混凝土梁进行了加固和测试，以探索不同组合方案对梁抗弯性能的影响。结果表明，P-SWR对改善最初用EB-CFRP薄板或NSM-CFRP筋加固的梁的开裂行为和延性至关重要。发现NSM-CFRP钢筋和P-SWR的加固方案比EB-CFRP薄板和P-SWR的加固方案更好。根据测试结果，给出了适当选择加固方案的建议。

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  • 来源
    《Magazine of Concrete Research》 |2019年第14期|749-760|共12页
  • 作者

    Li Xinghua; Wu Gang; Bian Renyuan;

  • 作者单位

    Southeast Univ, Sch Civil Engn, Minist Educ, Key Lab Concrete & Prestressed Concrete Struct, Nanjing, Jiangsu, Peoples R China;

    Southeast Univ, Sch Civil Engn, Minist Educ, Key Lab Concrete & Prestressed Concrete Struct, Nanjing, Jiangsu, Peoples R China;

    Southeast Univ, Sch Civil Engn, Minist Educ, Key Lab Concrete & Prestressed Concrete Struct, Nanjing, Jiangsu, 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

    beams girders; bond; composite materials;

    机译：梁和大梁;粘结;复合材料;

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