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Design by testing procedure for intermediate debonding in EBR FRP strengthened RC beams

机译：通过测试程序设计EBR FRP增强RC梁中的中间剥离

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摘要

Externally bonded (EB) Fiber-Reinforced-Polymer (FRP) sheets and laminates are widely employed for enhancing the bending capacity of reinforced concrete (RC) beams. However, the adhesion between FRP and concrete substrate is an issue of concern and generally controls the ultimate capacity of RC beams. Particularly, intermediate debonding phenomenon which begins from an intermediate point throughout the FRP-concrete interface is one of the most common and peculiar failure modes observed in RC beams externally strengthened in bending by bonded FRP. The present paper applies a well-established procedure for calibrating a design formula for determining the maximum axial strain developed in FRP at the onset of intermediate debonding failure. The procedure is based on the well-known design-by-testing approach based on the availability of a wide collection of experimental results. General behavioral observations are firstly derived by analyzing a large number of experimental results available in the scientific literature and collected by the authors. Such results are finally used for calibrating a design formula which looks after the key mechanical parameters controlling the bond behavior. The model uncertainties are handled through a consistent statistical procedure leading to a sound definition of the characteristic value of the relevant design quantities.
机译：外部粘结（EB）纤维增强聚合物（FRP）板和层压板广泛用于增强钢筋混凝土（RC）梁的抗弯能力。但是，FRP与混凝土基材之间的粘合性是一个值得关注的问题，通常会控制RC梁的极限承载力。特别地，从整个FRP-混凝土界面的中间点开始的中间剥离现象是在通过粘合的FRP外部弯曲的RC梁中观察到的最常见和特殊的破坏模式之一。本文采用了一套完善的程序来校准设计公式，该公式可确定在发生中间脱胶故障时在FRP中产生的最大轴向应变。该程序基于众所周知的按测试设计方法，该方法基于大量实验结果的可用性。一般的行为观察首先是通过分析大量科学文献中可用并由作者收集的实验结果得出的。这些结果最终用于校准设计公式，该公式遵循控制粘合行为的关键机械参数。通过一致的统计程序处理模型不确定性，从而合理定义相关设计量的特征值。

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  • 来源
    《Engineering Structures》 |2013年第1期|147-154|共8页
  • 作者

    A. Bilotta; C. Faella; E. Martinelli; E. Nigro;

  • 作者单位

    Department of Structural Engineering, University of Naples 'Federico II', Naples, Italy;

    Department of Civil Engineering, University of Salerno, Fisciano (SA), Italy;

    Department of Civil Engineering, University of Salerno, Fisciano (SA), Italy;

    Department of Structural Engineering, University of Naples 'Federico II', Naples, Italy;

  • 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

    FRP; RC beams; external strengthening; intermediate debonding; design-by-testing;

    机译：玻璃钢;钢筋混凝土梁;外部加强;中间剥离通过测试设计;

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