﻿ 弯剪裂缝引起的FRP-混凝土界面剥离分析

# 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

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.

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