SHEAR STRENGTH OF HIGH – STRENGTH STEEL FIBRE REINFORCED CONCRETE RECTANGULAR BEAMS

In IS 456-2000, the design equation proposed for shear strength of concrete beam does not consider the effect of steel fibres. In this paper, the experimental shear strength by various authors and the predicted shear strengths using the proposed equations in the literatures were reviewed and also experimental investigations were carried out on the shear strength of High Strength Steel Fibre Reinforced Concrete rectangular beams of characteristic compressive strength 80MPa. The ratio between the experimental and theoretical strength possess wide variation, so an equation is suggested for shear strength by comparing the experimental results with that of the theoretical results. Six beams were tested with varying fibre content and shear-span to effective depth ratios. The experimental results were compared with the strengths obtained using the equations proposed in the literature and also with the analytical results. This study reports that the ultimate strength increases significantly as the fibre content increases.