Shear Strength Capacity of Normal and High Strength Concrete Beams Bonded by CFRP Wraps

Abstract-The usage of fiber reinforced polymer (FRP) is becoming a widely accepted repairing and strengthening aspect in the field of civil engineering in recent years. By the application of polymers of carbon, glass and aramid in the shear zone of the beam, the shear strength can be increased extensively. The present study investigates the enhancement of shear capacity of RC beams using carbon reinforced polymers. Total of 24 beams were casted in the laboratory, out of which, 12 M30 and 12 M70 concrete beam specimens of 150mm width, 200mm depth and 1300mm length. The geometry of all kept constant, but only shear reinforcement was varied. Out of 12 beams of M30, 6 were control beams and 6 were strengthened by using CFRP. Out of 12 beams of M70, 6 were control beams and 6 were strengthened by using CFRP. The strengthened beams showed 34 % to 58 % increase in shear capacity with respect control beam in normal strength i.e. M30 beams and 28 % to 44 % in high strength i.e. M70 beams. Index Term- Fiber reinforced polymer (FRP), carbon fiber reinforced polymer (CFRP), glass fiber reinforced polymer (GFRP) and aramid fiber reinforced polymer (AFRP), shear capacity. I