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本文通过在混凝土表面跨缝贴FRP(纤维增强复合材料)布的双剪试验,重点研究了表面跨缝贴FRP布-混凝土界面粘结-滑移机理。试验结果表明,初始裂缝对其附近的FRP-混凝土界面粘结-滑移关系有明显影响,且初始裂缝深度越大,影响越明显。通过对试验数据的拟合及大量试算,本文提出了在无初始裂缝前提下及有初始裂缝前提下都能运用的FRP-混凝土界面粘结-滑移本构模型,该模型包括初始裂缝深度、界面上的点到初始裂缝的距离等参数。
In this paper, the double-shear test of FRP (fiber reinforced composite) fabric cross-stitched on concrete surface is focused on the bond-slip mechanism of surface cross-stitched FRP cloth-concrete interface. The experimental results show that the initial crack has a significant effect on the bond-slip relationship of the FRP-concrete interface nearby, and the greater the initial crack depth is, the more obvious the influence is. Through the fitting of the experimental data and a large number of trial calculations, this paper presents the FRP-concrete interface bond-slip constitutive model which can be used without any initial fracture and with initial fracture. The model includes the initial fracture depth , The interface point to the initial crack distance and other parameters.