Torsional behavior of hybrid fiber reinforced shear walls an experimental point of view

• Published in: Structural concrete : journal of the FIB 2023-08, Vol.24 (4), p.4660-4679
• Main Authors: Bayrak, Barış, Kılıç, Mahmut, Maali, Mahyar, Çelebi, Oğuzhan, Aydın, Abdulkadir Cüneyt
• Format: Article
• Language: English
• Subjects: Aspect ratio; Carbon fibers; Crack propagation; Energy absorption; Energy dissipation; Fiber reinforced materials; fiber reinforcement; High rise buildings; hybrid; Lateral loads; plastic hinge; Plastic properties; Reinforced concrete; Reinforcement; Reinforcing steels; shear wall; Shear walls; Stiffness; Torsion
• ISSN: 1464-4177; 1751-7648
• DOI: 10.1002/suco.202200840

The shear wall system is one of the most commonly used lateral load‐resisting systems in reinforced concrete (RC) high‐rise buildings. The present work is designed to investigate the behavior of reinforced shear walls upon their hybrid fiber ratio, the horizontal reinforcement ratio, and for the reinforcement aspect ratio. For this purpose, nine‐shear walls were manufactured. The same longitudinal reinforcement ratio and the steel and carbon fibers were the main design concept. Withal, the self‐compacting concrete with fiber hybridization was the general perspective for the RC. All the shear wall models were inspected not only for torsion, but also for the energy dissipation capacity, crack propagation, etc. Torsional moment capacity increased, when the hybrid fiber ratio rose up from 0% to 1.0% and then 1.5%. However, this increase was larger in case of increasing the hybrid fiber ratio from 0% to 1.0%. Increasing the hybrid fiber ratio from 1.0% to 1.5% did not result in a performance increase as in the first case. Increasing the fiber ratio from 0% to 1% and from 1% to 1.5% increased the maximum torsional moment between 7.39% and 33.41%. Torsional moment and twist angle capacities increase with the increase in hybrid fiber and horizontal reinforcement ratio and the decrease in the aspect ratio in RC shear walls. Withal, the energy absorption capacity, ductility, and stiffness are also increased as the hybrid fiber ratio. Increasing the hybrid fiber ratio decreased the crack density in the plastic hinge region. Decreasing the aspect ratio from 1.5 to 1.25 increased the dissipation energy capacity between 68.75% and 100%. The addition of 1.0% fiber, a significant increase in the value of ~30% and 53% was achieved stiffness after the crack.