SHEAR STRENGTH OF CONCRETE BEAMS REINFORCED WITH GLASS FIBRE REINFORCED POLYMER (GFRP) BARS

摘要

The current paper presents the experimental results of the shear strength of concrete beamsreinforced with GFRP bars without transverse reinforcement. Ten large scale simply supported beamswith four point monotonic loading were tested to determine their shear capacity. The test variables wereshear span to depth ratio, reinforcement ratio and depth of beam. The test results were analysed andpresented in terms of crack and failure patterns, cracking and ultimate loads, GFRP and concrete strains.It was observed that the shear strength decreases with increasing shear span to depth ratio, a/d. Similartrends were observed for beams with the same a/d ratio but higher beam depth, d. However, thedecrease in the shear strength with increasing the depth is less significant. On the other hand, the shearstrength decreases with increasing the reinforcement ratio for beams with depth 350 mm; whereas thestrength increases with increasing the reinforcement ratio for beams with depth 500 mm. CanadianStandard for shear design of FRP reinforced concrete beams (CSA S806-02) gives unconservative resultfor one of the beams with a/d equal to 3.5 and effective depth, d, equal to 305 mm.