Steel fibers for replacing minimum reinforcement in beams under torsion

Abstract This paper concerns an investigation on six large-scale Steel Fiber Reinforced Concrete (SFRC) beams tested in pure torsion. All had longitudinal rebars to facilitate the well-known space truss resisting mechanism. However, order promote economic use of material, transverse reinforcement (i.e. stirrups/links) was varied large scale beams. The latter contained either no stirrups, or minimum amount (according Eurocode 2), hooked-end steel fibers (25 50 kg/m 3 ). Material characterization were also carried out determine performance parameters SFRC. results this study show that SFRC with a post-cracking class greater than 2c Model Code 2010) is able completely substitute required for In fact, addition contributes significantly increase maximum torque and twist when compared same specimen without fibers. Moreover, provides rather high stiffness steadier development cracking process as classical RC elements. phenomenon improves beam behavior at serviceability limit state. experimental are critically discussed available analytical models well other tests into literature.