FRP加固混凝土箱型梁的抗剪贡献计算方法研究

STUDY ON CALCULATION METHODS OF SHEAR CAPACITY CONTRIBUTION OF FRP STRENGTHENED CONCRETE BOX BEAMS

简要介绍了目前已有的FRP加固混凝土梁抗剪承载力的计算方法。考虑混凝土箱型梁斜裂缝的分布规律对FRP应变分布的影响和腹板侧移变形对FRP-混凝土界面粘结性能的弱化影响,给出了FRP抗剪加固混凝土箱型梁平均有效应变的确定方法,进而提出了加固混凝土箱型梁FRP抗剪贡献的计算方法,通过与试验结果的对比,本文提出的计算方法的计算结果与试验值吻合较好。

The shear capacity calculation methods of the RC beam strengthened with FRP at present were introduced. Considering the influence of distribution of the oblique crack of concrete box girder on FRP strain distribution and the influence of the lateral deformation of the web on the bonding performance of the interface of FRP with concrete, the method for the determination of the average effective strain of concrete box beam strengthened with FRP, and the calculation method for the shear capacity contribution of FRP of the strengthened concrete box beam were proposed. Through the comparison with the experimental results, the calculation results of the method proposed in this paper are in good agreement with experimental values.