SIMULATION OF THE INFLUENCE OF STEEL FIBERS ON THE SHEAR BEHAVIOR OF REINFORCED CONCRETE BEAMS

An analytical model is presented for predicting complete shear load-deformation response of reinforced concrete sections taking into account the steel fibers reinforced concrete. This model is based on the equilibrium, compatibility equations and stress-strain relationships which are formulated in term of average stresses and average strains. This model is able to analyze sections having unusual forms or reinforcing details, loaded in combined bending, axial load and shear. In the case of the steel fiber reinforced concrete, a stress-strain relation proposed by Kachi and al (2002) is adopted. Predictions of the model are compared with several calculated reinforced beams and are shown to estimate the effect of the steel fibbers on the shear stiffness of the sections in the case of the elastic linear domain, after concrete cracking and after reinforcement yielding.