Moment redistribution in continuous steel-fibre-reinforced concrete slabs

Abstract

The phenomenon of moment redistribution in steel-fibre-reinforced concrete (SFRC) members has not been adequately studied. In this study, the phenomenon was investigated by conducting point-load tests on seven two-span, one-way continuous slabs without traditional reinforcement. Significant redistribution of moments from the elastic values was observed at the critical mid-span and interior support sections. An analytical approach to predict the moment–curvature response of SFRC is presented, with which the predicted variation of moments with increasing load compared to the observed trends with reasonable accuracy. Also, the analytical approach predicts the load-carrying capacity of the slabs within 8% of the average observed values, with a standard deviation of 8%. In addition, the load–deflection curves of the slabs were well predicted. The results are beneficial for the analysis and design of a SFRC slabs-on-pile system by considering moment redistribution due to slab continuity.