Three-point bending tests were carried out on nineteen Reinforced Concrete (RC) beams strengthened with FRP in the form of completely wrapping. The strip width to spacing ratios, FRP type, shear span to effective depth ratios, the number of FRP layers in shear, and the effect of stirrups spacing were the parameters investigated in the experimental study. The FRP contribution to strength on beams having the same strip width to spacing ratios could be affected by the shear span to effective depth ratios and stirrups spacing. The FRP contributions to strength were less on beams with stirrups in comparison to the tested beams without stirrups. Strengthening RC beams using FRP could change the failure modes of the beams compared to the reference beam. In addition to the experimental study, a number of equations used to predict the FRP contribution to the shear strength of the strengthened RC beams were assessed by using a limited number of beams available in the literature. The effective FRP strain is predicted by using test results, and this prediction is used to calculate the FRP contribution to shear strength in ACI 440.2R (2017) equation. Based on the statistical values of the data, the proposed equation has the lowest coefficient of variation (COV) value than the other equations.

对 19 根 FRP 以完全包裹形式加固的钢筋混凝土 (RC) 梁进行了三点弯曲试验。试验研究中研究了带材宽度与间距比、FRP 类型、剪切跨距与有效深度比、FRP 剪切层数和箍筋间距的影响的参数。FRP 对具有相同条宽间距比的梁的强度贡献可能受剪跨与有效深度比和箍筋间距的影响。与没有箍筋的测试梁相比，带箍筋的梁的 FRP 对强度的贡献较小。与参考梁相比，使用 FRP 加固 RC 梁可以改变梁的失效模式。除了实验研究，通过使用文献中可用的有限数量的梁，评估了许多用于预测 FRP 对加固 RC 梁的抗剪强度贡献的方程。利用试验结果预测有效 FRP 应变，该预测用于计算 ACI 440.2R (2017) 方程中 FRP 对剪切强度的贡献。基于数据的统计值，所提出的方程具有最低的变异系数（COV ) 值高于其他方程。