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Comparative Study on Flexural Strengthening of RC Beams using CFRP Laminate by Different Techniques

机译:不同技术CFRP层压体RC光束弯曲强化的比较研究

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This paper presents a detailed study on flexural behaviour of RC beams strengthened using Carbon Fiber Reinforced Polymer (CFRP) laminate. A detailed study was made on strengthened beam using Externally Bonded Laminate (EBL) and Internally Bonded Laminate (IBL) techniques. In IBL technique the laminate is sandwiched between the layers of epoxy mounted on the cover portion by the groove. The beams were designed as under-reinforced section. Totally six beams were casted, out of this two beams were control beams. Strengthened beams were divided into two sets (IBL and EBL) of two beams each. The main aim of this work is to delay the debonding failure in order to enhance the ultimate load carrying capacity for strengthened beams. Four- point bending flexural tests were conducted on specimens up to failure. The experimental results illustrate that, the strengthened beams significantly increases the cracking, working and ultimate load when compared with control beams. IBL technique shows the significant increase in the debonding strain by delaying the beam from debonding failure which in turn enhances the ultimate load by almost 73% compared with control beam and 39% with EBL technique. All the deflection values from the experiments are within the limit of codal provisions. The IBL technique was emerged as the better strengthening technique, which increases almost 41% of working load (P_w) compared with strengthening codes.
机译:本文介绍了使用碳纤维增强聚合物(CFRP)层压体加固RC光束的弯曲行为的详细研究。使用外粘合的层压材料(EBL)和内键合层压板(IBL)技术在加强光束上进行详细研究。在IBL技术中,层压板夹在安装在盖部分上的环氧树脂层之间。梁设计为加强部分。铸造了六个光束,其中两个光束是控制梁。每个光束的加强梁分为两个束(IBL和EBL)。这项工作的主要目的是延迟剥离失败,以提高增强梁的最终负荷承载能力。在达到失败的试样上进行了四点弯曲弯曲试验。实验结果表明,与控制梁相比,加强光束显着增加了裂缝,工作和最终负载。通过延迟借助于剥离的故障,IBL技术表明借助于剥离率的显着增加,这反过来与控制梁相比,近73%的最终负载和EBL技术的39%。实验中的所有偏转值都在代码规定的限制范围内。与加强码相比,IBL技术被出现为更好的加强技术,这增加了近41%的工作负荷(P_W)。

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