Study on Shear Behaviour of High Strength Concrete (HSC) Slender Beams

Abstract: In this paper an experimental investigation is carried out on Twelve HSC beams with constant width (125 mm) and effective depth (100 mm) by varying (i) shear span to depth ratio, (ii) the longitudinal reinforcement ratio and (iii) the minimum web reinforcement ratio were casted and tested to understand the shear behavior of the beams with minimum web reinforcement as per IS CODE and ACI CODE and maximum web reinforcement as per IS CODE. The load-deflection behavior and the failure pattern of the beams, ultimate shear strength and reserve shear strength are studied with varying a/d ratio and longitudinal reinforcement. The results obtained are compared with the different codal equations. Based on these observations, it can be concluded that, there are many parameters influencing the shear behavior of RC beams such as shear span to depth ratio (a/d ratio>2), concrete grade, depth of the beam and the percentage of the longitudinal reinforcement The results obtained were compared with the different codal equations. The British code model is proposed for the present work. Key Words: High strength concrete, shear span to depth ratio. Reserve strength, failure pattern, ultimate shear capacity, codal provisions. I