EXPERIMENTAL STUDY ON STEEL FIBER REINFORCED CONCRETE BEAMS IN PURE TORSION

This paper concerns an experimental study on Steel Fiber Reinforced Concrete (SFRC) beams tested under pure torsion. The beams are reinforced with longitudinal rebars without any transverse reinforcement that was substituted by high strength steel fibers. Experimental results show that SFRC allows a stable torsional behavior after cracking, in terms of enhanced crack control, increased cracked stiffness and torsional resistance. In order to predict the response of SFRC beams, an analytical model reported in the literature has been used and adapted to the fib Model Code 2010 provisions. The results of the model prediction are compared against the experimental results and critically discussed.