Fire behavior of GFRP-reinforced concrete structural members: a state-of-the-art review

The use of glass fiber–reinforced polymer (GFRP) bars in reinforced concrete (RC) structures has grown significantly in recent years, most notably in bridge deck applications, as they provide an innovative solution to address stringent durability requirements in severe environmental conditions. However, concerns regarding the degradation of mechanical properties of GFRP bars and their bond to concrete at elevated temperature, as well as a lack of fire design guidance, remain obstacles to their widespread use in buildings. This paper presents a review of the available literature regarding the fire performance of GFRP-RC structural members, as well as a summary of relevant research needs. First, it addresses the effects of elevated temperature on the thermal and mechanical properties of GFRP bars. Second, experimental and numerical studies of GFRP bars’ bond behavior at elevated temperature, and of the fire performance of GFRP-RC beams and slabs, are discussed. Finally, the available fire design guidance is discussed, and recommendations for future research are given.