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首页> 外文期刊>International Journal of Solids and Structures >Nonlinear fracture mechanics of flexural-shear crack induced debonding of FRP strengthened concrete beams
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Nonlinear fracture mechanics of flexural-shear crack induced debonding of FRP strengthened concrete beams

机译：FRP加固混凝土梁受弯剪裂缝的非线性断裂力学

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摘要

External bonding of FRP plates or sheets has emerged as a popular method for strengthening reinforced concrete structures. Debonding along the FRP-concrete interface can lead to premature failure of the structures. In this study, the FRP-concrete interface debonding induced by a flexural-shear crack is analyzed using a nonlinear fracture mechanics approach. A bilinear bond-slip model is used to simulate the shear traction-separation law of the FRP-concrete interface; while the normal traction-separation law of the interface is approximated by a triangular model. Closed-form solutions of interfacial stresses, the axial force of the FRP plate are obtained for the whole debonding process and verified with numerical analysis using finite element analysis. The peeling effect induced by the flexural-shear crack is accounted for and its effect on the interface debonding is examined in detail in this study. Parametric studies are conducted to provide a better understanding of the mode-dependent debonding process induced by the flexural-shear crack. The present model provides a unified description of the debonding initiation and propagation, which can be used to analyze rnixed-mode debonding of the FRP-concrete interface efficiently and effectively. (c) 2008 Elsevier Ltd. All rights reserved.
机译：FRP板或板的外部粘结已成为加强钢筋混凝土结构的常用方法。沿FRP-混凝土界面脱粘会导致结构过早损坏。在这项研究中，使用非线性断裂力学方法分析了由弯曲剪切裂纹引起的FRP-混凝土界面剥离。采用双线性结合-滑移模型模拟FRP-混凝土界面的剪力-分离规律。而界面的正常牵引分离定律是通过三角模型近似的。在整个脱胶过程中，获得了界面应力，FRP板的轴向力的闭合形式解，并通过有限元分析进行了数值分析。在这项研究中，考虑了弯曲剪切裂纹引起的剥离效应，并详细研究了其对界面剥离的影响。进行了参数研究，以更好地理解由弯曲剪切裂纹引起的依赖于模式的脱胶过程。本模型提供了脱胶起始和传播的统一描述，可用于高效地分析FRP-混凝土界面的混合模脱胶。 （c）2008 Elsevier Ltd.保留所有权利。

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