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Effect of load distribution on IC debonding in FRP-strengthened RC beams: Full-scale experiments

机译：载荷分布对FRP加固RC梁中IC脱胶的影响：全面实验

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摘要

This paper presents an experimental study into the effect of load distribution on intermediate crack (IC) debonding in FRP-strengthened RC beams, an issue which has received very limited attention so far. Five large-scale FRP-plated RC beams were tested in two series to investigate the effects of shear span and load uniformity on IC debonding respectively. The tests indicated that increasing the load uniformity and shortening the shear span both had a beneficial effect on the maximum moment in the beam (i.e., mid-span moment) at IC debonding failure, and they led to an increase in the mid-span moment by up to 18.5%. The test results were next used to assess the accuracy of two existing IC debonding strength models which are applicable to different load distributions. The assessment results show that one of the approaches is rather conservative while the other approach significantly over-predicts the effect of load distribution.
机译：本文对FRP加固RC梁中载荷分布对中间裂纹（IC）脱胶的影响进行了实验研究，这一问题迄今为止受到的关注非常有限。在两个系列中测试了五个大规模的FRP镀RC横梁，分别研究了剪切跨度和载荷均匀性对IC剥离的影响。测试表明，增加载荷均匀性和缩短剪切跨度都对IC脱胶失败时梁的最大力矩（即中跨力矩）产生了有益的影响，并且导致中跨力矩的增加高达18.5％。接下来，将测试结果用于评估适用于不同负载分布的两个现有IC剥离强度模型的准确性。评估结果表明，其中一种方法相当保守，而另一种方法则大大高估了负荷分配的效果。

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  • 来源
    《Composite Structures》 |2018年第3期|483-496|共14页
  • 作者

    Fu B.; Teng J. G.; Chen G. M.; Chen J. F.; Guo Y. C.;

  • 作者单位

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

    Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Hong Kong, Peoples R China;

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

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

    Guangdong Univ Technol, Sch Civil & Transportat Engn, Guangzhou, Guangdong, 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

    FRP; Flexural strengthening; Concrete beam; Debonding; Load distribution; Arching action;

    机译：FRP;抗弯加固;混凝土梁;脱胶;荷载分布;拱作用;

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