标题:
弯剪裂缝引起的FRP-混凝土界面剥离分析Analysis on Flexural/Shear Crack Induced Debonding between FRP-Concrete Interface
作者:
琚宏昌, 张贝宜
关键字:
FRP, 内聚力区域模型, 混合模式, 弯剪裂缝, 剥离Fiber Reinforced Polymer (FRP); Cohesive Zone Model; Mixed-Mode; Flexural/Shear Crack; Debonding
期刊名称:
《Hans Journal of Civil Engineering》, Vol.2 No.3, 2013-07-22
摘要:
采用非线性断裂力学方法,分析了由弯剪裂缝引起的FRP-混凝土界面剥离。通过对界面采用三线性剪切本构关系和双线性正应力本构关系，考虑了由弯剪裂缝引起的正应力对界面剥离作用，得出了单悬臂构件在整个剥离过程中的应力解析解，并与实验结果进行验证。结果表明，该模型能够有效地分析混合模式下界面剥离。
In order to analyze the debonding failure of concrete beams strengthened with externally bonded fiber-rein- forced-polymer (FRP) plates, which may be induced by a major flexural/shear crack in the span, this paper adopts a nonlinear fracture mechanics approach and proposes a cohesive zone model that uses a novel nonlinear bond-slip model to simulate the shear stress-separation of the FRP-concrete interface, while the normal stress-separation law of the interface is approximated by a linear elastic model. We can obtain the closed-form solutions of interfacial stresses, FRP stress for a typical single-lap specimen for the whole debonding process and verified with experimental results. The comparison confirms the validation of the CZM in modeling the mixed-mode debonding of FRP-concrete interface.