Prestressed beams are widely used in construction today. Prestressed concrete has several advantages, including enlarging the span of beams, reducing the thickness of buildings, and saving materials compared to regular reinforced concrete. This research demonstrates an experimental program to study the effect of longitudinal tensile stresses as well as the amount of longitudinal reinforcement on prestressed concrete beams under the influence of torsion loads. The behavior of beams is analyzed before, during and after fracture. In this research, seven samples of prestressed beams that were identical in dimensions and characteristics were tested, and the variable were only the longitudinal reinforcement ratio and the pre-Compression stress (P_e/A). After conducting the test, the behavior of the seven beams was analyzed and clarified, which included the crack load and fracture load, twisting angle, torsion moment, deflection curve, stiffness degradation and finally the displacement ductility. It is clear that the maximum load and ductility increased with the increase in longitudinal sidebar. Also, the peak load increased as the Pre-Compression stress (P_e/A) increased. On the other hand, the displacement ductility decreased.
 
Special Issue of AEIC 2024 (Civil Engineering  Session)