It has been demonstrated that glass fibre-reinforced polymer (GFRP) bars is a suitable alternative to traditional steel reinforcement in concrete structures. GFRP bars are a competitive reinforcing option in reinforced concrete members subjected to flexure and shear. GFRP has compelling physical and mechanical properties, corrosion resistance and electromagnetic transparency. The use of GFRP reinforcement is particularly attractive for structures that operate in aggressive environments, such as in coastal regions, or for buildings that host magnetic resonance imaging (MRT) units or other equipment sensitive to electromagnetic fields. However its behaviour under impact loading is not adequately known. This study involved testing a total of twelve GFRP Reinforced Concrete (RC)
beams under static and impact loadings and analysing the effect of certain variables including longitudinal reinforcement ratio and concrete strength (normal and high strength). Experimental results confirm that beams with GFRP as internal reinforcement have extremely low post cracking bending stiffness. One noticeable outcome was that, beams subjected to impact loading experienced a “shear plug” type of failure, with shear cracks around the impact zone, even though the beams were designed as flexure-critical. Beams under static loading showed mostly flexural responses with flexural cracks developing until compression failure for the over-reinforced specimens.