Debonding issues of FRP composites with concrete surface

Abstract

In Modern days fiber-reinforced polymer (FRP) composites are rigorously applied to strengthen reinforced
concrete structures. FRP composites t proved to be very efficient in gaining higher strengths at structural member
level. However, the main issue regarding its use is that it detached from concrete surface. Most practiced methods for
FRP-to-concrete applications had shown very positive results, those methods such as FRP U-jackets, Anchoring with
FRP anchors, bolting metal plates on FRP composites sheets and mechanical anchoring fastener. The efficiency of
those anchoring methods had been tested and equations regarding strains have been developed. Based on those
models, strength can be predicated for concrete members, however, strength of the structural system cannot be exactly
predicated as the actions in structural system become different during cyclic loading. New anchorage methods, need
to be explored to prevent debonding in structural system rather than for single structural members.