FIBER-REINFORCED CONCRETE BEAMS UNDER TORSION

The effect of steel fibers on the behavior and ultimate strength of reinforced concrete beams under torsion is studied Glued standard bright wires of designation ZC 60/0.8 were used. A total of six beams was cast and tested Three beams reinforced with longitudinal reinforcements only had fiber percentages of 0, 0.6, and 1.2, respectively. The other three beams reinforced with longitudinal reinforcement and stirrups had the same percentages of fibers as the first group. Improvements in the first crack and ultimate strengths were noticed. These improvements depend on the volume percentages of fibers. The experimental ultimate strength values were compared with theoretical values obtained from torsion formulas. A good correlation of results is shown clearly.