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Performance of damaged RC beams repaired and/or strengthened with FRP sheets: An experimental investigation

机译:使用FRP纸张修复和/或加强损坏的RC梁的性能:实验研究

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This paper presents the results of an analytical and experimental study on the performance of repaired and strengthened rectangular Reinforced Concrete (RC) beams using epoxy injection and externally bonded Fibre Reinforced Polymer (EBR FRP) sheets. Five small-scale beams were tested under four-point bending in two phases. In Phase 1, three beams were tested up to the load level that induced cracking at service condition, whereas the other two beams were tested up to failure and used as control specimens. In Phase 2, one of the damaged beams was repaired using epoxy injection, subsequently strengthened using EBR FRP, and then tested again up to failure, whereas the other two specimens were only FRP-strengthened and tested up to failure. The test results indicate that the flexure capacity of a repaired and FRP-strengthened beam increased by up to 25% over the control beam, thus confirming that the strengthening solution was very effective at enhancing the flexural capacity of damaged RC beams. Moreover, the predictions given by linear cracked sectional analysis and the current ACI 440 guidelines match well the deflection response of the strengthened beams but only up to a service load.
机译:本文介绍了使用环氧注射和外键合纤维增强聚合物(EBR FRP)片材的修复和强化矩形钢筋混凝土(RC)梁的性能的分析和实验研究结果。在两个阶段的四点弯曲下测试五个小尺度梁。在阶段1中,测试三个光束达到在服务条件下诱导开裂的载荷水平,而另外两个光束被测试到失败并用作对照样本。在阶段2中,使用环氧注射修复其中一个损坏的梁,随后使用EBR FRP加强,然后再次测试失效,而另外两种样品仅被强化并测​​试失效。测试结果表明,在控制梁上,修复和FRP加强光束的弯曲能力增加到25%,从而证实强化溶液在提高损坏的RC梁的弯曲能力方面非常有效。此外,通过线性裂纹截面分析给出的预测和当前的ACI 440指南匹配良好的增强光束的偏转响应,而是仅达到服务负载。

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