Design of GFRP Reinforced Concrete Beam as per IS 18256:2023 and IS 456:2000 Code Provisions : A Theoretical Method

This research outlines design guidelines for concrete beams reinforced with glass fibre reinforced polymer (GFRP) bars in accordance with IS 18256:2023 and IS 456:2000 code regulations. The primary benefits of using glass fibre reinforced polymer rods over traditional steel reinforced rods are their reduced weight and increased resistance to corrosion; however, the bending failure mode of FRP-RC beams is brittle rather than ductile due to the linear elasticity of FRP bars until failure and the small elongation at break. In this study, the dimensions of the GFRP reinforced concrete beams are 150x150x700mm, doubly-reinforced with 12mm diameter, 660mm length GFRP rebars and 6mm diameter, 3/4in steel stirrups designed using IS 18256:2023 and IS 456:2000. The preferred failure mode for FRP-RC elements is concrete crushing compression failure, which provides multiple warnings prior to failure. Stated differently, an over-reinforced structure is better than an under-reinforced structure for FRP-RC beams, in contrast to the standard design technique for reinforced concrete (steel-RC) beams. Furthermore, the FRP RC component bends and breaks more than the steel RC member due to its low stiffness of the FRP rod. These elements restrict the range of applications for FRP. This is an example of a rectangular beam that complies with IS requirements and has tension reinforcement.