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研究使用外贴纤维增强复合材料(FRP)以U型包裹无锚固方式对钢筋混凝土梁进行抗剪加固情况下的FRP应力不均匀分布系数Dfrp表达式。结合已有研究,提出一个新的Dfrp表达式,并将该表达式与现有的FRP-混凝土界面粘结应力模型相结合以得出若干个不同的FRP抗剪贡献值计算模型。此外,从近年相关研究的文献中,建立了一个U型无锚固FRP抗剪加固钢筋混凝土梁的实验数据库,通过将上述模型对数据库中实验试件抗剪贡献的预测值与数据库中相应的实验值进行对比,分析各个模型的优劣,最终得出一个最优的、简便安全且适用于工程实践的FRP抗剪承载力贡献模型。
In this paper, the expression of the non-uniform distribution coefficient of FRP (Dfrp) under the condition of shear reinforcement of reinforced concrete beams with U-shape wrapped and anchored without FRP is studied. Combining the existing research, a new Dfrp expression is proposed, and this expression is combined with the existing FRP-concrete interfacial bonding stress model to obtain several different FRP shear contribution value calculation models. In addition, an experimental database of U-type FRP shear-strengthened RC beams is established based on the literature of recent years. By comparing the predicted values of shear contribution of experimental models in the database with the corresponding experiments in the database And compare the advantages and disadvantages of each model to get an optimal, simple and safe FRP shear capacity contribution model that is suitable for engineering practice.