Shear resistance of steel fibre reinforced concrete beams

Abstract

The purpose of the present research is to investigate the shear behavior of fibre reinforced concrete beams under four point loading condition. Three types of fibres were examined: hooked-end steel fibre, crimped-steel fibre and continuous deformed-steel fibres. The experimental program consists of cubes to test the compressive strength of concrete, cylinders to test the tensile strength of concrete and beams to test the shear and flexure strength of concrete. Simply supported RC beams 150×150 mm cross section and 700 mm length were used in this study. The reinforcement was provided in three ways viz. conventional minimum steel reinforcement at top and bottom with stirrups in accordance with the provisions of IS 456, conventional minimum bottom steel reinforcement without stirrups incorporating crimped steel fibre in 03%, 0.4% and 0.5% dose and crimped steel fibre in 1.5% dose without top and bottom steel reinforcement and stirrups. The shear span to depth ratio was varied as 0.5, 1, 1.25 and 1.5. The experimental program consisted of twenty sets of beam specimens giving a total of forty beams in two replications each. The aim of this research is to investigate the effectiveness of fibres on the shear strength and ultimate load carrying capacities.