Analysis on Interfacial Performance of CFRPConcrete with Different Thickness of Adhesive Layer and CFRP Plate

Qingyong Guo,Lei Chen,Wensong Zhang,Huijian Zhao,Jize Mao,Huining Xiao

doi:10.1051/matecconf/201714202001

Abstract

The bond behavior of CFRP-concrete interface is the analysis foundation for concrete structures with external strengthening CFRP. In the paper, the influences of the thickness of CFRP plate and adhesive layer on interfacial adhesive properties are investigated through the finite element program. The influence rules of the thickness on the interfacial ultimate bearing capacity and the effective bond length are performed. The results show that the thickness of adhesive layer and CFRP plate has a significant effect on the interfacial performance of CFRP-concrete.

Highlights

IntroductionThe strengthening of building structure has become the focus of attention
In recent years, the strengthening of building structure has become the focus of attention
The ultimate bearing capacity of the interface increases generally as the thickness of the adhesive layer decreases and as the thickness of the CFRP plate increases.Fig. 2(a) shows that the ultimate bearing capacity of 1mm CFRP plate increases firstly and decreases with the increase of the adhesive layer thickness, and reaches the maximum around 2.0mm. It is almost flat for 1.4mm CFRP plate and goes down for 2.0mm CFRP plate

Summary

Introduction

The strengthening of building structure has become the focus of attention. The study on interfacial properties of CFRP-concrete plays an important role in analysis on the performance of CFRP reinforced concrete structures. It is shown that the thickness of CFRP plate and interface adhesive layer have great influences on the interfacial bond behavior of CFRP-concrete. There arefew researches focus on the effects of the thickness of interface adhesive layer on bonding properties for CFRP- concrete. Carried out single shear test finding that the initial peel load increases with the thicker adhesive layer[3].It is found that the layer thickness is one of the most important parameters for interfacial adhesive properties of CFRP and concrete,and there are differences among existing conclusions. The paper studies the influences of the thickness of CFRP plate and adhesive layer on interfacial adhesive properties by dint of the numerical analysis.

Plastic damage constitutive model of concrete

Constitutive model of interface element

The interface bond slip model

Finite element model

Results analysis and discussion

Summary