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Analysis of RC beams strengthened with mechanically fastened FRP (MF-FRP) strips

机译：机械固定FRP（MF-FRP）筋加固的RC梁的分析

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The analytical model for reinforced concrete beams strengthened using mechanically-fastened fiber reinforced polymer (MF-FRP) pultruded strips is discussed in this paper. In this method, FRP strips, reinforced with a combination of carbon and E-glass unidirectional fibers and continuous strand mats, are fastened to the concrete with steel powder-actuated (PA) fasteners and expansion anchors (EA). The model predicts the ultimate strength and failure modes of MF-FRP strengthened beams and was developed based on results of tests on over 75 RC beams of many different sizes using the MF-FRP method, that have been conducted over the last five years. These tests have explored numerous different failure modes and factors affecting the behavior of MF-FRP strengthened beams. The analytical model can be used to proportion the strengthening system for an RC beam so as to cause the beam to fail in a unique ductile failure mode. This procedure was used to proportion strengthening systems for large-scale beams (7.3 m long by 51 cm × 51 cm) that were used to verify the analytical procedure. The strengthened RC beams were designed to fail in a ductile manner. In the test results presented in this paper, the strengthened beams showed increases in yield and ultimate moments of up to 25% and 58%, respectively over an unstrengthened beam. All strengthened beams failed, as intended, in a ductile manner with the ultimate failure mode due to concrete compression failure at large deflections with the FRP strip still firmly attached. Comparisons between the analytical predictions and the experimental results show good agreement.
机译：本文讨论了用机械固定的纤维增强聚合物（MF-FRP）拉挤条增强的钢筋混凝土梁的分析模型。在这种方法中，用碳粉和E-玻璃单向纤维和连续绞合毡增强的FRP条通过钢粉驱动（PA）紧固件和膨胀锚（EA）固定在混凝土上。该模型预测了MF-FRP加固梁的极限强度和破坏模式，并且该模型是根据最近五年使用MF-FRP方法对75种不同尺寸的RC梁进行测试而得出的。这些测试探索了多种不同的失效模式和影响MF-FRP增强梁性能的因素。分析模型可用于按比例分配RC梁的加固系统，以使梁在独特的延性破坏模式下失效。该程序用于比例梁大型系统（7.3 m长x 51 cm×51 cm）的比例增强系统，该系统用于验证分析程序。加固的RC梁被设计为以延性方式破坏。在本文介绍的测试结果中，与未加强的梁相比，加强梁的屈服强度和极限弯矩分别增加了25％和58％。由于混凝土在大挠度下的压缩破坏，而FRP条仍牢固地固定，所有加固的梁都按照预期的方式以延性方式破坏，并最终破坏。分析预测与实验结果之间的比较显示出很好的一致性。

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