Studying the FRP-Concrete Bond Behavior of Normal and Light-Weight Concrete Using FEM

Abstract

The main objective of the present study is to investigate the behavior of FRP-concrete bond of two types of concrete (normal and light weight concrete) using different concrete properties. For this purpose, a model of single shear test was selected and modeled using ANSYS program to study the FRP-concrete bond. The modeling was represented in two ways: with epoxy material (epoxy model) and without epoxy material (full bond model). These two models were formulated and used in the analysis process. Different models of two types of concrete (normal and light weight concrete) were analyzed in order to study bond behavior. In general, the full bond model gave results of more good agreement with the available experimental results than the epoxy model. The average difference between the experimental and analytical failure load was 5.35% and 10.32% for the full bond and epoxy model, respectively. It was found that the increasing in compressive strength of concrete leads to increasing in the bond capacity and the greater concrete compressive strength the better utility of the CFRP sheet. As the compressive strength was increased from 20 to 40MPa, the bond strength of normal concrete and light weight concrete models increased by about 81% and 106%, respectively.