Abstract
Interfacial bond between fibre-reinforced polymer (FRP) composite bars and the surrounding concrete is an important factor in the composite performance of FRP-reinforced concrete beams under load. When exposed to harsh environmental conditions the interfacial bond has been shown in numerous small-scale experimental studies to significantly deteriorate. It is therefore essential that the magnitude of the deterioration is quantified in order for the long-term performance of FRP-reinforced concrete (FRP-RC) members to be determined. In this study, a database consisting of 544 observations of bond strength test results as well as a sub-set database of 315 observations of bond stress-slip results is compiled and statistically analysed in order to quantify reduction factors for both the bond strength and the bond stress-slip behaviour of FRP-RC members. The outcomes of this analysis are further applied to investigate the deterioration required to cause a change in failure mode from bar rupture to bar debonding in order for the deterioration of reinforcement to be considered in reinforcement detailing requirements.
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