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<p>The rising demand for efficient structural systems in modern construction has increased the use of high-strength steel (HSS), particularly in hollow rectangular columns valued for their torsional rigidity, aesthetics, and space efficiency. However, existing design codes, based on mild steel, often fail to account for the complex buckling behaviours seen in thin-walled HSS members under axial compression. Additionally, the effect of geometric parameters like aspect ratio on axial performance remains insufficiently studied. This paper explores the compressive performance of cold-formed high-strength steel rectangular hollow sections through detailed finite element simulations. Twenty-one stub column models with varying aspect ratios were analyzed using a finite element-based program, incorporating material and geometric nonlinearities, initial imperfections, and boundary conditions based on verified experimental data. A numerical parametric study is performed with varying member geometry (aspect ratio). The simulations focused on peak load capacities and failure behaviour under axial compression. The outcomes indicate that the axial load-carrying capacity of cold-formed steel compression members is strongly influenced by the cross-sectional aspect ratio. Members with a higher aspect ratio of 3.0 exhibited the greatest peak strength, with an ultimate load of 434.64&#xa0;kN observed in Member 1, primarily due to their larger cross-sectional dimensions. In contrast, members with lower aspect ratios (2.5 and 2.0) achieved moderate to lower peak capacities, reflecting a distinct relationship between sectional geometry and compressive strength. Although high aspect ratio members possessed greater initial stiffness, they experienced premature strength degradation beyond the peak load, predominantly caused by local buckling phenomena. Conversely, low aspect ratio members displayed more stable post-peak responses, marked by a gradual decline in strength and failure mechanisms dominated by global buckling, thereby offering enhanced ductility and energy absorption capacity.</p>

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Numerical study on the structural performance of hollow rectangular high-strength steel columns under axial compression for advanced construction applications

  • 期刊论文

  • 发表日期：

    2025年11月29日

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  • Ravikant Singh,
  • Ankita Choudhury,
  • M. K. Haridharan,
  • S. Anandha Kumar,
  • Keerat Kumar Gupta

摘要

The rising demand for efficient structural systems in modern construction has increased the use of high-strength steel (HSS), particularly in hollow rectangular columns valued for their torsional rigidity, aesthetics, and space efficiency. However, existing design codes, based on mild steel, often fail to account for the complex buckling behaviours seen in thin-walled HSS members under axial compression. Additionally, the effect of geometric parameters like aspect ratio on axial performance remains insufficiently studied. This paper explores the compressive performance of cold-formed high-strength steel rectangular hollow sections through detailed finite element simulations. Twenty-one stub column models with varying aspect ratios were analyzed using a finite element-based program, incorporating material and geometric nonlinearities, initial imperfections, and boundary conditions based on verified experimental data. A numerical parametric study is performed with varying member geometry (aspect ratio). The simulations focused on peak load capacities and failure behaviour under axial compression. The outcomes indicate that the axial load-carrying capacity of cold-formed steel compression members is strongly influenced by the cross-sectional aspect ratio. Members with a higher aspect ratio of 3.0 exhibited the greatest peak strength, with an ultimate load of 434.64 kN observed in Member 1, primarily due to their larger cross-sectional dimensions. In contrast, members with lower aspect ratios (2.5 and 2.0) achieved moderate to lower peak capacities, reflecting a distinct relationship between sectional geometry and compressive strength. Although high aspect ratio members possessed greater initial stiffness, they experienced premature strength degradation beyond the peak load, predominantly caused by local buckling phenomena. Conversely, low aspect ratio members displayed more stable post-peak responses, marked by a gradual decline in strength and failure mechanisms dominated by global buckling, thereby offering enhanced ductility and energy absorption capacity.