FRP抗剪加固RC梁的应力不均匀分布系数研究

Reserch on Non-uniform Coefficients of FRP Stress in FRP Shear Strengthened RC Beam

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。

This paper concentrates on researching the formula about non-uniform coefficient Dfrpof FRP stress externally bonded to the surface of concrete beam with U-wrapping configuration and without anchoring.Based on the previous work,this paper suggests a new expression of Dfrp,and combines this expression with existing bond stress model of FRP-concrete interface,then gets several different calculation models of FRP shear capacity contribution Vf.Besides,the authors summrize the officially published professional literatures in past 20 years and set up a database concerning using FRP to strengthen the reinforced concrete beam in shear with U-wrapping configuration without anchoring.Comparing the predicted value of Vffrom above calculation models with the exprimental value from database,whereafter analysing the advantages and the drawbacks of all calculation models,finally we get an optimal,convenient and safe model,which is suitable for engineering practice.