Computers and Concrete

  • 제32권2호
  • /
  • Pages.173-184
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  • 2023
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  • 1598-8198(pISSN)
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  • 1598-818X(eISSN)
테크노프레스 (Techno-Press)
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Behavior of recycled steel fiber-reinforced concrete beams in torsion- experimental and numerical approaches

  • Mohammad Rezaie Oshtolagh (Department of Civil Engineering, University of Tabriz) ;
  • Masood Farzam (Department of Civil Engineering, University of Tabriz) ;
  • Nima Kian (Chair of Structural Concrete, Helmut Schmidt University/University of the Federal Armed Forces Hamburg) ;
  • Hamed Sadaghian (Department of Civil Engineering, University of Tabriz)
  • 투고 : 2022.05.02
  • 심사 : 2023.04.28
  • 발행 : 2023.08.25
⟨ 이전 논문 다음 논문 ⟩

초록

In this study, mechanical, flexural post-cracking, and torsional behaviors of recycled steel fiber-reinforced concrete (RSFRC) incorporating steel fibers obtained from recycling of waste tires were investigated. Initially, three concrete mixes with different fiber contents (0, 40, and 80 kg/m3) were designed and tested in fresh and hardened states. Subsequently, the flexural post-cracking behaviors of RSFRCs were assessed by conducting three-point bending tests on notched beams. It was observed that recycled steel fibers improve the post-cracking flexural behavior in terms of energy absorption, ductility, and residual flexural strength. What's more, torsional behaviors of four RSFRC concrete beams with varying reinforcement configurations were investigated. The results indicated that RSFRCs exhibited an improved post-elastic torsional behaviors, both in terms of the torsional capacity and ductility of the beams. Additionally, numerical analyses were performed to capture the behaviors of RSFRCs in flexure and torsion. At first, inverse analyses were carried out on the results of the three-point bending tests to determine the tensile functions of RSFRC specimens. Additionally, the applicability of the obtained RSFRC tensile functions was verified by comparing the results of the conducted experiments to their numerical counterparts. Finally, it is noteworthy that, despite the scatter (i.e., non-uniqueness) in the aspect ratio of recycled steel fiber (as opposed to industrial steel fiber), their inclusion contributed to the improvement of post-cracking flexural and torsional capacities.

키워드

참고문헌

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