SHEAR-MOMENT ANALYSIS OF REINFORCED HIGH-STRENGTH CONCRETE BEAMS CONTAINING STEEL FIBERS

This paper concerns the incorporation of steel fibres in singly reinfo rced high strength concrete beams without stirrups failing under the c ombined effect of flexure and shear. A new equation for predicting the shear strength of reinforced high strength concrete beams is develope d. This equation shows a good correlation with own test data of 16 rei nforced high strength concrete beams with and without steel fibres and numerous published experimental data for beams with concrete compress ive strength up to 140 MPa. The flexural capacity of reinforced high s trength concrete beams is also investigated. The existing ACI method f or predicting the flexural strength of steel fibre concrete composites is slightly modified to be applicable for high strength concrete. Bas ed on the proposed equations, an analytical model is developed for pre dicting the relative flexural capacity, i.e., the ratio of the moment with shear interaction to the pure flexural moment.