الفهرس 
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Abstract
Introduction: Enhancing the torsional capacity of reinforced concrete (RC) beams while maintaining reasonably economic and efficient cross-sections poses a practical challenge in the design of such elements. Thus, developing and testing economically viable reinforcing techniques for enhancing the torsional capacity of RC beams is a significant aspect. Among these techniques is the continuous spiral reinforcement system that has shown promising results in enhancing the torsional capacity of rectangular RC elements. -Research scope: Studying the role of continuous rectangular spiral stirrups, as a transverse reinforcement with a controllable pitch (P) and inclination angle (θ), in enhancing the torsional behavior of rectangular solid and hollow RC beams. -Research objective: Investigating experimentally the torsional behavior of concrete beams reinforced with inclined spirals. Also, an extensive study for the experimental investigation will be conducted using a numerical analysis by a finite element program ANSYS V-15.0 to conduct a parametric study about this subject. -Steps study: Testing some beams with common closed stirrups as a reference beams and also testing another beams using different spiral stirrups ratios by variation of pitch (P), inclination angle (θ) and stirrups diameter and also variation of longitudinal RFT ratio. Also, Verifying a simulation model developed using ANSYS V-15.0 by comparing the numerical results against the experimental results. Finally, Conducting a parametric study using ANSYS V-15.0 in order to gain a deep understanding of the influence of different parameters on the torsional strength and strain energy. -Conclusions : Results showed that using inclined spiral rectangular stirrups in reinforcing RC solid and hollow beams greatly enhanced the torsional capacity by about 16% and 18%, respectively compared to using the conventional closed stirrups. Also, the comparison between the results obtained from numerical model and experimental results showed good agreement.