Overview on the theoretical prediction of shear resistance of steel fibre in reinforced concrete beams

Abstract

This paper presents the experimental results and theoretical study on the shear strength of reinforced steel fibre concrete beams. Failure of reinforced concrete beams in form of diagonal tension failure has been very complex to predict accurately. The inclusion of steel fibre substantially increased the ductility of the concrete and improves the shear behaviour of the beams. Due to bridging effects provided by the steel fibre, it reduces the brittle shear failure of plain concrete. Previous test data were categorized by the influence of steel fibre in reinforced concrete beams. All test results showed that steel fibre has a significant influence on the ultimate shear strength of reinforced concrete beam and control the development of crack propagation. A discussion on the contribution of steel fibre on the shear strength is also presented, with reference to the past researcher formula and RILEM provisions. The shear strength prediction for steel fibre reinforced concrete beams were compared with those obtained by the experimental test. The comparison shows that the mean value of the ratio of the experimental ultimate shear strength to predicted ultimate shear strength for the beams tested was about 0.59 to 1.96.