Tensile stress-strain models for steel fiber reinforced concrete

In this study, a simplified analytical multi-linear tensile stress-strain model was introduced to predict the flexural tensile behaviour of steel fiber reinforced concrete (SFRC). Two different tensile stress-strain models namely End Tapered Four Linear Model (ETFLM) and Linear two Step Model (LTSM) were initially selected to study the feasibility. The selected model predictions were validated using experimental results from three-point bending test of SFRC notch beam. However, ETFLM showed better force-deformation behaviour compared to the LTSM. Thereafter, ETFLM was further simplified by incorporating the concrete residual strength characteristics. Finally, a correlation to estimate the residual strength was developed using the steel fiber properties such as strength, geometric characteristics and dosage which makes the proposed simplified model more user friendly.