ANALYTICAL AND EXPERIMENTAL BEHAVIOR OF CONTINOUS RC BEAM WITH SPRIAL TRANVERSE REINFORCEMENT UNDER PURE TORSION

The use of continuous rectangular spiral shear reinforcement as transverse reinforcement is analytically investigated under pure torsion. In this paper, four inclination angle of stirrups (80⁰, 75⁰, and 45⁰) and traditional(90⁰) kind of stirrups are adopted. The behavior of the torsion in beams is studied through monitoring the load–deflection curves, ultimate load values, vertical deflections measurements and crack propagation during static tests. The analytical torsional capacity of the beams is compared with Numerical values from the design for torsion formulas by using ACI and Macgregor Method. Test results clearly indicate that using rectangular spiral shear reinforcement improved the Torsion capacity of beams compared with traditional individual closed stirrup beams. Using rectangular spiral shear reinforcement is recommended because it improves the stiffness in beams and can reduce the total cost due to labor costs.