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Performance of preloaded CFRP-strengthened fiber reinforced concrete beams

机译：预载CFRP加强纤维钢筋混凝土梁的性能

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摘要

Extensive experimental investigation was conducted to evaluate the performance of fiber reinforced concrete (FRC) beams that have been externally strengthened with and without preloading in flexure using carbon fiber reinforced polymer sheets. Steel, synthetic and hybrid fibers (mix of steel and synthetic fibers) with a volume fraction of 0.5% were added to the concrete matrix to prepare 15 beams. Test results show that the addition of all fibers types improved the flexural capacity, crack initiation and propagation, stiffness, post cracking behavior, deflection and ductility of the beams. Hybrid fibers was found to improve the ductility of the FRC beams by 4 times when compared to the control specimen without fibers. Furthermore, preloading before strengthening of concrete beams without fibers led to increase of the ultimate capacity by about 120%. Preloading caused improvement in elastic stiffness of the beams by 33.4%, 23.5% 17.6 for steel, synthetic and hybrid fibers, respectively. While strengthening increased the elastic stiffness for all beams and up to 65.3%. However, for the FRC beams there was no significant improvement in the ultimate capacity from those strengthened without preloading. Applicability of ACI 440 equations to predict the capacity of fiber reinforced concrete beams was also investigated.
机译：进行了广泛的实验研究，以评价纤维增强混凝土（FRC）梁的性能，其使用碳纤维增强聚合物板在弯曲中进行外部加强，而无需预加载。向混凝土基质中加入钢，合成和杂交纤维（钢和合成纤维的混合），体积分数为0.5％以制备15个光束。测试结果表明，添加所有纤维类型的添加改善了梁的弯曲能力，裂纹启动和传播，刚度，横梁后裂解性，偏转和延展性。发现杂化纤维在没有纤维的对照样品比较时将FRC光束的延展性改善4次。此外，在加强没有纤维的混凝土梁之前预加载导致最终容量的增加约120％。预加载引起钢，合成和混合纤维的33.4％，23.5％17.6的弹性刚度的提高。加强所有梁的弹性刚度增加，高达65.3％。然而，对于FRC光束，在没有预加载的情况下，在加强的那些容量中没有显着改善。 ACI 440方程的适用性还研究了预测纤维钢筋混凝土梁的容量。

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  • 来源
    《Composite Structures》 |2020年第7期|112262.1-112262.12|共12页
  • 作者

    Helal Kareem; Yehia Sherif; Hawileh Rami; Abdalla Jamal;

  • 作者单位

    SPME Middle East Gen Contracting LLC Dubai U Arab Emirates;

    Amer Univ Sharjah Dept Civil Engn & Mat Sci Sharjah U Arab Emirates|Amer Univ Sharjah Engn Inst MSERI Sharjah U Arab Emirates;

    Amer Univ Sharjah Dept Civil Engn & Mat Sci Sharjah U Arab Emirates|Amer Univ Sharjah Engn Inst MSERI Sharjah U Arab Emirates;

    Amer Univ Sharjah Dept Civil Engn & Mat Sci Sharjah U Arab Emirates|Amer Univ Sharjah Engn Inst MSERI Sharjah U Arab Emirates;

  • 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

    Strengthening; CFRP; Fiber reinforced concrete; Preloading; Steel fiber; Synthetic fiber;

    机译：加强;CFRP;纤维增强混凝土;预加载;钢纤维;合成纤维;

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