JSTE_V1_N3_RP4 Tantary M.A. Upadhyay A. Prasad J. Journal on Structural Engineering 2320 - 2343 1 3 32 38 Fibre Based Concrete, Ductility, Aspect Ratio, Fibre Factor Steel fibre based concrete is now being increasingly used in different structural applications, including buildings, bridges, pavements etc. complete stress strain curve of the material is therefore essentially needed for the analysis and design of structures. In this study an experimental investigation was carried out to generate the complete stress strain curve for fibre concrete, containing crimped steel fibres. Four types of crimped steel fibres with aspect ratio of 33.5, 36, 45 and 80 respectively, were used in four different volume fractions (0.5, 1.0, 1.5, 2.0 %) in four different concrete mixes. The vital parameters of fibre concrete namely peak stress, strain at peak stress, toughness and the nature of stress strain curve was studied. A simple analytical model was proposed for stress- strain diagram of steel fibre concrete in uni-axial compression. The model was compared with experimental results and a good agreement was noticed between the two. September - November 2012 Copyright © 2012 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=2020