The influence of steel fibers on the bond slip behavior between rebars and concrete: Experimental and analytical investigation

Present research brings a broad analysis on the influence of steel fibers on quasi-static and fatigue rebar pull out loading. The analysis covers the impact of fiber addition on diverse mechanical parameters, such as peak bond strength, stiffness and bond degradation under fatigue. A model previously developed for single fiber pull out in the literature was modified in order to study the bond response through analytical equations. The fiber rein -forcement is responsible for providing post-crack resistance to the composite, raising the confinement around the interface and significantly increasing the peak bond strength. Moreover, by enhancing the bond strength, the addition of steel fibers could successfully increase fatigue life of cyclic pull out tests. Finally, the proposed model for rebar pull out from steel fiber reinforced concrete matrices successfully fitted the bond-slip behavior observed the experimental data. The model divided the bond-slip response in three distinct stages: elastic, nonlinear and dynamic.