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Failure diagrams of FRP strengthened RC beams

机译：FRP加固RC梁的破坏图

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摘要

Amongst various methods developed for strengthening and rehabilitation of reinforced concrete (RC) beams, external bonding of fibre reinforced plastic (FRP) strips to the beam has been widely accepted as an effective and convenient method. The experimental research on FRP strengthened RC beams has shown five most common modes, including (ⅰ) rupture of FRP strips; (ⅱ) compression failure after yielding of steel; (ⅲ) compression failure before yielding of steel; (ⅳ) delamination of FRP strips due to crack; and (ⅴ) concrete cover separation. In this paper, a failure diagram is established to show the relationship and the transfer tendency among different failure modes for RC beams strengthened with FRP strips, and how failure modes change with FRP thickness and the distance from the end of FRP strips to the support. The idea behind the failure diagram is that the failure mode associated with the lowest strain in FRP or concrete by comparison is mostly likely to occur. The predictions based on the present failure diagram are compared to 33 experimental data from the literature and good agreement on failure mode and ultimate load has been obtained. Some discussion and recommendation for practical design are given.
机译：在为加强和修复钢筋混凝土（RC）梁而开发的各种方法中，纤维增强塑料（FRP）条与梁的外部粘结已被广泛接受为一种有效且方便的方法。 FRP加固RC梁的试验研究表明，有五种最常见的模式，包括（ⅰ）FRP条的破裂； （ⅱ）屈服后的压缩破坏； （ⅲ）屈服之前的压缩破坏； （ⅳ）由于裂纹导致的玻璃钢带分层； （ⅴ）混凝土盖分离。在本文中，建立了一个破坏图，以显示用FRP筋加固的RC梁在不同破坏模式之间的关系和传递趋势，以及破坏模式如何随FRP厚度和从FRP端到支撑的距离而变化。失效图背后的思想是，与FRP或混凝土中最低应变相关的失效模式相比，很可能会发生。将基于当前故障图的预测结果与文献中的33个实验数据进行比较，并且在故障模式和极限载荷方面取得了很好的一致性。给出了一些实用设计的讨论和建议。

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