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Shear repair of RC beams using epoxy injection and hybrid external FRP

机译：使用环氧树脂注入和混合外部FRP进行RC梁的剪切修复

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摘要

This experimental study aims at investigating the behavior of reinforced concrete (RC) beams strengthened by unidirectional and hybrid bidirectional fiber-reinforced polymer (FRP) sheets and subjected to cyclic loading. RC beams tested under cycled loading were subsequently repaired using both epoxy injection and external FRP sheets, and then re-tested under monotonic loading. Six RC beam specimens, two of which were control specimens and four were shear deficient, were upgraded with side-bonded FRP sheets in the first phase of the experimental program. In the second phase, three of the damaged beams were repaired using epoxy injection and unidirectional carbon fiber polymer (CFRP) sheets. The repairing method, FRP type, and FRP wrapping scheme were the test variables investigated. Test results show that the repair schemes imparted significant mechanical improvements in terms of ultimate shear capacity and ductility. The simultaneous application of epoxy injection and externally bonded FRP sheets was found to be a highly effective repair technique.
机译：这项实验研究的目的是研究单向和混合双向纤维增强聚合物（FRP）板加固的钢筋混凝土（RC）梁的性能，并对其进行循环荷载作用。随后在循环荷载下测试的RC梁使用环氧树脂注入和外部FRP板进行修复，然后在单调荷载下进行重新测试。在实验程序的第一阶段中，对6个RC梁样本进行了升级，其中2个是对照样本，而4个是剪切不足的样本。在第二阶段中，使用环氧树脂注入和单向碳纤维聚合物（CFRP）板修复了三个受损梁。修复方法，FRP类型和FRP包装方案是研究的测试变量。测试结果表明，修复方案在极限剪切能力和延展性方面赋予了显着的机械性能。发现同时应用环氧树脂注射剂和外部粘合的FRP片材是一种非常有效的修复技术。

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