Shear strength of steel fibre RC beams under repeated loads

Abstract

The purpose of this work was to examine the possibility of employing steel fibres rather of standard shear strengthening, on the shear strength, crack widths and distribution, and flexural strength in concrete beams under repeated loading. When adding steel fibres, it leads to the modification of many properties of concrete, especially tensile strength. Simply supported concrete fibrous reinforced beams without web reinforcement have the dimensions of (2100 × 150 × 300) mm with three different volume fractions (0, 0.5, and 1.0) % of steel fibres under monotonic and repeated shear loading were analyzed using ABAQUS software. A repeated load was applied on the analyzed beam by two points of loading and for ten cycles up to failure. The results indicate decrease in the ultimate shear strength and an increase in the number and widths of the crack under repeated load compared with the results of a monotonic load. The results show that the deflection under repeated load was higher than deflection under monotonic load.