Finite Element Modelling of GFRP Reinforced Concrete T - Beams

Abstract

The present study's primary goal is to evaluate the static load behavior of internal GFRP-reinforced RC T-beams utilizing finite element analysis software called ANSYS. Fibre Reinforced Polymer (FRP) composite is defined as a polymer that is reinforced with fibre. It represents a class of materials that fall into a category referred to as composite materials. Fibre reinforced polymers (FRP) are being used extensively in the rehabilitation and retrofitting of existing structures as an external reinforcement because of their properties like high strength to weight and stiffness to weight ratios, corrosion resistance, light weight and high durability. In reinforced concrete structures like bridges, chimneys, high-rise buildings, etc., they are particularly utilised. In place of steel, FRP reinforcements are now employed in structures that are mostly built along the shore or in hostile conditions. These reinforcements come in the shape of reinforcing bars. The primary benefit of FRP rebar is its corrosion resistance, light weight, durability and easy handing. The FRP rebars are being used worldwide for many structures including bridge structures as well, but not well explored because of its availability. Totally twelve numbers of specimens were considered in this study with varying parameters such as type of reinforcements, reinforcements ratio and concrete grade. Modelling of the T- beams were done with ANSYS using solid 65 and link 8 element and the same were analyzed under static loading conditions. The results obtained from the ANSYS were compared with the theoretical and experimental analysis. Based on the comparison suitable conclusions and recommendations are made in this research work. It has been experimentally proven that GFRP bars have a lower modulus of elasticity than steel bars. Since GFRP reinforcement has a lower modulus of elasticity than steel reinforcement, the deflection was larger in the GFRP-reinforced specimens. Compared to a normal steel reinforced beam, the GFRP reinforced beam has a greater maximum moment bearing capability. According to stress-strain curves, the FRP reinforced beams display brittle behavior before failing. However, concrete compression is the most common failure mode. The GFRP reinforced beam can handle almost as much weight as a normal steel reinforced beam. In comparison to a normal steel reinforced beam, the GFRP reinforced beam had a greater residual deflection value.