FRP布-混凝土界面有限元分析

使用清华大学土木工程系开发的RCFER2002程序,成功地对FRP布-混凝土界面剥离进行了数值模拟

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FRP布-混凝土界面粘结性能的有限元分析,
Finite Element Analysis For Debonding in the Interface Between FRP Sheet and Concrete

工程力学,Engineering Mechanics, 21(6), 2004. 45-50

摘 要:FRP布与混凝土界面的粘结性能是粘贴FRP布加固混凝土结构中的关键问题。本文首先讨论了该界面问题有限元分析的难点及建模方法,根据使用现有有限元程序试算的结果,讨论了界面问题中混凝土力学行为的特点及对混凝土本构模型的要求;在此基础上,提出了适用于分析FRP布-混凝土界面问题的混凝土本构模型,并编制了相应的程序,对FRP布-混凝土面内剪切问题进行了分析。分析结果与试验结果吻合较好,并给出了混凝土本构模型中相应参数的建议取值。基于数值模拟结果,对FRP布-混凝土界面粘接力学机理进行了初步讨论。

关键词:混凝土与钢筋混凝土结构,界面粘结,有限元分析,FRP布

Abstract: The debonding behavior in the interface between FRP sheet and concrete is a key problem for the application of FRP. The difficulties of finite element analysis for this interface problem are discussed, firstly, and advises are given for the FEA modeling. Then, from the numerical tests with several FEA softwares, the requirements for the constitutive relationship model of concrete in this problem are discussed. Based on former analysis, an improved planar concrete constitutive relationship mode is developed and the interface debonding of FRP sheet and concrete under shear force are simulated with this improved model. The numerical results are consistent with the test results. And the parameter values in this problem are suggested. Based on the numerical results, the mechanism in interface is discussed.

Keywords: concrete and reinforced concrete structure, interface bonding, finite element analysis, FRP sheet

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