SHEAR MODULUS OF THE INTERFACIAL BOND BETWEEN STEEL FIBERS AND CONCRETE

An analytical model for determining the interfacial bond shear modulus of steel-fibre-reinforced concrete is presented. The band shear modul us is a constant that linearly relates the bond shear stress to the fi bre slippage at the interface. The analytical model is developed based on the axisymmetric modelling of the pulled-out steel fibre from the surrounding concrete. The model assumes elastic behaviour for both the concrete and the steel fibres. The analytical model evaluates the tot al displacement of the fibre when pull-out loads are applied at the fi bre end. Experimental analyses are used in conjunction with the analyt ical model to determine the bond shear modulus. The results of the num erical analysis of a few selected experiments are presented. The propo sed model is used to evaluate a constant value for the bond shear modu lus.