TORSION IN REINFORCED NORMAL AND HIGH-STRENGTH CONCRETE BEAMS .1. EXPERIMENTAL TEST SERIES

This work examines the behavior of reinforced normal concrete (NSC) an d high-strength concrete (HSC) beams subjected to pure torsion. The te st series consisted of 12 totally over-reinforced beams, with paramete rs that influence torsional capacity and concrete strength as the only variable. Therefore, the cross-sectional dimensions, and strength and dimensions of the reinforcement, were constant for all beams. The con crete strength varied between 36 and 110 MPa (5220 and 15,959 psi). Th e test series has shown the advantage in using HSC. In addition to a h igher cracking load and higher ultimate torsional capacity, use of HSC for a given cross section and given torque results in higher torsiona l stiffness, lower crack width, and lower reinforcement stresses compa red to NSC.