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为分析FRP-混凝土组合梁的斜截面受剪承载力,在拉压杆模型的基础上,建立了考虑FRP板与混凝土界面发生黏结滑移的FRP-混凝土组合梁拉压杆受剪承载力模型。该模型中,将配置在受拉区的FRP板简化为拉杆,而将变形非协调区的混凝土简化为压杆。为反映FRP与混凝土界面之间的黏结,建立了拉压杆节点区的破坏准则———界面剪应力达到最大黏结剪应力。为验证建立模型的有效性,对已有的试验梁进行了受剪承载力和斜裂缝开裂角度的计算分析。计算结果表明,建立的受剪承载力模型可以有效地预测组合梁的受剪承载力和斜裂缝开裂角度,与试验值吻合较好。
In order to analyze the shear strength of oblique section of FRP-concrete composite beams, a shear bearing capacity model of FRP-concrete composite beam considering the bond-slip between FRP plate and concrete is established . In this model, the FRP plate located in the tension zone is reduced to a tie rod, while the concrete in the deformed non-coherent zone is reduced to a tie rod. In order to reflect the bond between the FRP and the concrete interface, the failure criterion of the node area of the tension and compression bar was established --- the interfacial shear stress reached the maximum bond shear stress. In order to verify the validity of the model, the shear strength and the crack initiation angle of the existing test beams were calculated. The calculated results show that the established shear capacity model can effectively predict the shear capacity and the angle of cracking of the composite beam, which is in good agreement with the experimental data.