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<p>CFST columns have proven to offer excellent structural stability and promote rapid development in the construction industry. This paper examines the compressive strength and structural behaviour of concrete-filled steel tubular columns. In this research, concrete confinement was achieved using fibres, including 2% crimped flat steel fibre (SF), 0.1% polypropylene fibre (PF), and 1% glass fibre (GF). Furthermore, the concrete is reinforced with welded wire mesh (WWM) and HYSD reinforcement bars. Based on existing studies, fibre-reinforced concrete (FRC) with an optimal fibre volume fraction is used, and hybridisation (HyFRC) is employed to compare the composite system’s strength and compatibility. Also, 10 × 10 WWM spaced 1&#xa0;mm apart, and 6&#xa0;mm RC bars, are embedded in the concrete core. A total of twelve short columns with various composition combinations were cast and tested under uniaxial compression to evaluate their performance. These results show the best combination and highlight the synergistic effects of fibre reinforcement and steel embedment on the axial load-bearing capacity and ductility of these composite members. In addition, comparisons of failure mechanisms, confinement effects, ductility index (DI), stiffness index (SI), and energy absorption are presented. Analytical work was conducted to predict the axial compressive strength of a column in accordance with codal provisions and ANN, considering various parameters such as steel and concrete area, percentage of steel and concrete, slenderness ratio, material properties, and confinement ratio.</p>

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Axial compression and synergistic interactions of fibres, welded steel mesh, and rebar in concrete-filled steel tubular short columns

  • 期刊论文

  • 发表日期：

    2026年6月20日

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  • Kanchidurai Settu,
  • N. Rupakrishnan,
  • S. S. Vivek,
  • A. Suganya

摘要

CFST columns have proven to offer excellent structural stability and promote rapid development in the construction industry. This paper examines the compressive strength and structural behaviour of concrete-filled steel tubular columns. In this research, concrete confinement was achieved using fibres, including 2% crimped flat steel fibre (SF), 0.1% polypropylene fibre (PF), and 1% glass fibre (GF). Furthermore, the concrete is reinforced with welded wire mesh (WWM) and HYSD reinforcement bars. Based on existing studies, fibre-reinforced concrete (FRC) with an optimal fibre volume fraction is used, and hybridisation (HyFRC) is employed to compare the composite system’s strength and compatibility. Also, 10 × 10 WWM spaced 1 mm apart, and 6 mm RC bars, are embedded in the concrete core. A total of twelve short columns with various composition combinations were cast and tested under uniaxial compression to evaluate their performance. These results show the best combination and highlight the synergistic effects of fibre reinforcement and steel embedment on the axial load-bearing capacity and ductility of these composite members. In addition, comparisons of failure mechanisms, confinement effects, ductility index (DI), stiffness index (SI), and energy absorption are presented. Analytical work was conducted to predict the axial compressive strength of a column in accordance with codal provisions and ANN, considering various parameters such as steel and concrete area, percentage of steel and concrete, slenderness ratio, material properties, and confinement ratio.