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<p>Regarding reinforced concrete structures, a lot of work is being done to determine the strength of the main structural elements, such as slabs, columns, and beams. For a variety of loading scenarios, structures susceptible to opening moments—such as beam-column connections subject to seismic stresses, cantilevered retaining walls, bridge abutments, channels, and rectangular liquid-retaining structures—have been investigated. Yet little study has examined how aspect ratio, along with fibre content, affects the opening-moment capacity of U-type reinforced concrete (RCC) structures. To evaluate the U-type detailing procedure, this research utilised straight, crimped, and hooked steel fibres with aspect ratios of 30 and 50, along with the conventional reinforcement as a combined solution. In terms of volume fraction, each fibre type was 0.5%, 1.0%, 1.5%, and 1.75%. The study’s findings indicate that corner efficiency increases with fibre content, peaking at 1.5%. Specimens reinforced with hooked and crimped fibres perform better than straight fibre specimens. The average increase in corner efficiency observed is 29% for crimped fibres, 54% for hooked fibres, and 20% for straight fibre specimens. Further increasing the fibre content, the joint’s efficiency starts to drop. Furthermore, finite element modelling of fibrous and non-fibrous concrete corner joints under opening moments is conducted, and the findings are validated against experimental results.</p>

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Comparative analysis of experimental and analytical approaches to assessing the impact of steel fibre shape and aspect ratio on reinforced concrete corner openings

  • 期刊论文

  • 发表日期：

    2026年4月22日

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  • Neeru Singla,
  • Yeshpal Vasishta,
  • Ashok Kumar Gupta,
  • Aditya Kumar Tiwary

摘要

Regarding reinforced concrete structures, a lot of work is being done to determine the strength of the main structural elements, such as slabs, columns, and beams. For a variety of loading scenarios, structures susceptible to opening moments—such as beam-column connections subject to seismic stresses, cantilevered retaining walls, bridge abutments, channels, and rectangular liquid-retaining structures—have been investigated. Yet little study has examined how aspect ratio, along with fibre content, affects the opening-moment capacity of U-type reinforced concrete (RCC) structures. To evaluate the U-type detailing procedure, this research utilised straight, crimped, and hooked steel fibres with aspect ratios of 30 and 50, along with the conventional reinforcement as a combined solution. In terms of volume fraction, each fibre type was 0.5%, 1.0%, 1.5%, and 1.75%. The study’s findings indicate that corner efficiency increases with fibre content, peaking at 1.5%. Specimens reinforced with hooked and crimped fibres perform better than straight fibre specimens. The average increase in corner efficiency observed is 29% for crimped fibres, 54% for hooked fibres, and 20% for straight fibre specimens. Further increasing the fibre content, the joint’s efficiency starts to drop. Furthermore, finite element modelling of fibrous and non-fibrous concrete corner joints under opening moments is conducted, and the findings are validated against experimental results.