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采用界面单剪试验考察了FRP-混凝土界面的粘结行为。基于试验结果和不可逆热力学的弹性损伤理论建立了有限元模型,模拟了FRP-混凝土界面在加载过程中的损伤演化,提出了混凝土材料的损伤本构模型,编制了相应的ABAQUS用户子程序。结果表明,FRP-混凝土试件的数值计算结果与试验结果吻合较好,验证了有限元模型的正确性,并给出了混凝土本构模型中损伤特性参数的取值。研究结果表明,提出的基于损伤理论的有限元数值计算方法能够很好地描述FRP-混凝土构件整个界面的损伤演化和剥离破坏过程。
The interface shear test was used to investigate the bonding behavior of FRP-concrete interface. The finite element model was established based on the experimental results and the irreversible thermodynamics theory of elasticity damage. The damage evolution of FRP-concrete interface during loading was simulated. The damage constitutive model of concrete material was proposed and the corresponding ABAQUS user subroutine was compiled. The results show that the numerical results of FRP-concrete specimens are in good agreement with the experimental ones, the correctness of the finite element model is verified, and the damage characteristic parameters of the concrete constitutive model are given. The results show that the proposed numerical method based on damage theory can well describe the damage evolution and peel-off process of the entire interface of FRP-concrete structures.