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 :广西科技大学鹿山学院,柳州; 张贝宜 :广西科技大学土木工程系,柳州;

关键词: 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

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。

Abstract:
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.

文章引用: 琚宏昌 , 张贝宜 (2013) 弯剪裂缝引起的FRP-混凝土界面剥离分析。 土木工程, 2, 189-195. doi: 10.12677/HJCE.2013.23033

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