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Experimental study on strengthening of RC beams with Side Near Surface Mounted technique-CFRP bars

机译：侧面近表面贴装技术-CFRP筋加固RC梁的试验研究

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摘要

This paper presents an experimental program that was carried out for the purpose of studying the global flexural performance of reinforced concrete beams strengthened internally with Carbon Fiber Reinforced Polymer (CFRP) rods using the Side Near Surface Mounted (SNSM) technique. The CFRP rods were placed laterally, adjacent to the longitudinal steel bars inside precut grooves. The strengthening length and position of CFRP rods as well as the type of filling material were the main variables investigated in this study. Moreover, a detailed comparison between the Side Near Surface Mounted (SNSM) and the Near Surface Mounted (NSM) techniques for the strengthening of RC beams using CFRP rods was conducted as well; in order to validate and assess the effectiveness of the SNSM technique.The test results showed that using the SNSM-CFRP rods technique allowed improving in a significant way the load carrying capacity of RC beams but decreased their ductility along the deflection at maximum load. The results obtained indicated that the failure mode was influenced by the length of CFRP rods and the filling material characteristics, while the strengthening position did not have significant impact. The SNSM strengthening technique can be used as an alternative method to the NSM method, and in some cases, it may be used to prevent the non-conventional failure modes, due to degradation of the NSM strengthening system, such as the pull out of CFRP-rods or premature debonding failure. The conventional analytical model accurately predicted the strength capacity and mid-span deflection of the SNSM strengthened beams.
机译：本文介绍了一个实验程序，旨在研究使用侧向近表面安装（SNSM）技术在内部用碳纤维增强聚合物（CFRP）杆加固的钢筋混凝土梁的整体抗弯性能。 CFRP棒横向放置，与预切槽内的纵向钢筋相邻。 CFRP棒的加固长度和位置以及填充材料的类型是本研究中研究的主要变量。此外，还进行了侧向近表面安装（SNSM）和近表面安装（NSM）技术以使用CFRP杆加固RC梁的详细比较；测试结果表明，使用SNSM-CFRP杆技术可以显着改善RC梁的承载能力，但会降低其在最大载荷下沿挠度的延性。所得结果表明，破坏模式受CFRP棒长度和填充材料特性的影响，而加固位置的影响不明显。 SNSM增强技术可以用作NSM方法的替代方法，并且在某些情况下，它可以用于防止由于NSM增强系统的退化（例如拉出CFRP）而导致的非常规失效模式。 -杆或过早脱胶失败。常规分析模型可以准确地预测SNSM加固梁的强度能力和中跨挠度。

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