Numerical Analysis Of Rc Beam To Enhance The Torsional Resistance With Cfrp

Abstract

This research numerically represents the technique of increasing torsional strength of reinforced concrete (RC) beam using Carbon fiber reinforced polymer (CFRP) under pure torsion. Many researchers worldwide have extensively used fiber-reinforced polymer (FRP) strengthening materials to enhance the shear and flexural strengths of reinforced concrete RC beams. However, studies on torsional strengthening are limited. FRP laminate can be used as external reinforcement for the reintegration of RC structures and due to their high tensile strength and corrosion resistance, they are preferable over steel plates. This study aims at demonstrating the behavior of RC beams under pure torsion strengthened with CFRP sheets with different configurations. Total 4 beams are modeled with the dimension of (150x230x1500) mm. One of them is performed as a control beam and others are configured with different orientations of FRP sheets which are: fully wrapped, 900 vertical wrapped strips, 450 inclined wrapped strips. Ultimate torque, angle of twist, ultimate load and cracking angle has been measured from the numerical analysis. It is seen that CFRP performed better to increase the torsional strength compared to the control beam. Fully CFRP wrapped beam has increased the ultimate torque and ultimate load-carrying capacity by about 75.28% and 90 0 Vertical CFRP wrapped strip beam has decreased the maximum amount of angle of twist which is 66.33%. 450 Vertical CFRP wrapped strip beam gives the optimum results between fully wrapped and 900 Vertical CFRP wrapped strip beams. Finally, these results have been validated with the experimental result available in the literature and analytical calculation. Numerical study has been carried out by using Finite Element Software, ABAQUS to bring into focus the versatility and powerful analytical capabilities of finite element techniques by objectively modeling the complete response of beams