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Shear strengthening of RC beams using carbon fiber-reinforced polymer laminates.

机译：使用碳纤维增强的聚合物层压板对RC梁进行抗剪加固。

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摘要

Shear failure is catastrophic and occurs usually without advanced warning, thus it is desirable that the beam fails in flexure rather than in shear. Many existing reinforced concrete (RC) members are found to be deficient in shear strength and need to be repaired. Deficiencies occur due to several reasons such as insufficient shear reinforcement or reduction in steel area due to corrosion, increased service load, and construction defects. Externally bonded reinforcement such as Carbon Fiber Reinforced Polymer (CFRP) provides an excellent solution in these situations.;In order to investigate the shear behavior of RC beams with externally bonded CFRP shear reinforcement, experimental programs as well as analytical studies were conducted in this research. The research consists of three parts. They are (1) Regular beams with CFRP shear strengthening; (2) Deep beams with CFRP shear strengthening; and (3) Shear damaged beams with CFRP shear strengthening. CFRP laminates of various types and configurations were applied externally to the beams as shear reinforcement.;During the present experimental investigation, a total of five 4-foot long and six 6-foot long regular RC beams and sixteen 3-foot long deep RC beams were tested to study the behavior of shear strengthening using CFRP system. All beams were loaded by a 220-kip MTS TestStar II testing system. Results of the test demonstrate the feasibility of using externally applied, epoxy-bonded CFRP system to restore or increase the load-carrying capacity in shear of RC beams. The CFRP system has been found to increase significantly the serviceability, ductility, and ultimate shear strength of a concrete beam. Restoring beam shear strength using CFRP is a highly effective technique.;Based on the experiments and analysis carried out at NJIT and the results from other researchers, new analysis and design methods for both regular and deep RC beams with externally bonded CFRP shear strengthening have also been proposed as well.
机译：剪切破坏是灾难性的，并且通常在没有提前警告的情况下发生，因此希望梁弯曲而不是剪切破坏。发现许多现有的钢筋混凝土（RC）构件的抗剪强度不足，需要修复。出现缺陷的原因有很多，例如剪切强度不足或由于腐蚀而导致的钢材面积减少，使用负荷增加以及施工缺陷。碳纤维增强聚合物（CFRP）等外部粘结的钢筋在这种情况下提供了极好的解决方案。;为了研究带有外部粘结的CFRP剪力增强的RC梁的剪切性能，本研究进行了实验程序和分析研究。研究包括三个部分。它们是（1）CFRP剪力增强的常规梁； （2）CFRP抗剪加固的深梁； （3）采用CFRP抗剪加固来剪切受损的梁。将各种类型和构造的CFRP层压板外部施加到梁上作为抗剪增强材料；在本实验研究期间，总共有5个4英尺长和6个6英尺长的常规RC梁和16个3英尺长的深RC梁。被测试以研究使用CFRP系统的抗剪加固性能。所有光束均由220 kip的MTS TestStar II测试系统加载。测试结果表明，使用外部应用的环氧粘结CFRP系统恢复或增加RC梁的剪切承载能力的可行性。已经发现，CFRP系统可显着提高混凝土梁的使用寿命，延展性和极限抗剪强度。使用CFRP来恢复梁的抗剪强度是一项非常有效的技术。；基于在NJIT进行的实验和分析以及其他研究人员的结果，对于具有外部粘结CFRP抗剪加固的常规和深层RC梁的新分析和设计方法也已经有了也被提出。

著录项

  • 作者

    Zhang, Zhichao.;

  • 作者单位

    New Jersey Institute of Technology.;

  • 授予单位 New Jersey Institute of Technology.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 201 p.
  • 总页数 201
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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