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<p>Concrete in-filled tapered steel tubular columns have gained widespread popularity due to reduced material usage while maintaining structural integrity. To comprehensively investigate their performance and behavior both experimental investigation and an extensive numerical analysis was carried out using the finite element analysis software, ABAQUS 2020. The varying confining pressure along the length of the column is determined by numerical analysis. An equation to predict the confining pressure is also proposed. A Parametric study covering a wide range of column heights: 600&#xa0;mm, 1200&#xa0;mm, and 1500&#xa0;mm, each with varying taper angles of 0° to 3° has been carried out. A crucial aspect examined in the study is the interaction between the steel tube and concrete in-fill, with careful consideration of normal and tangential behavior, frictional parameters, and contact surface properties. This investigation also takes into careful consideration key parameters such as base diameter to thickness ratio (D<sub>b</sub>/t ranging from 33.33 to 100), Length to base diameter ratio (L/D<sub>b</sub> ranging from 3 to 9), and Strength to weight ratio(S/W). This study aims to provide a deeper insight into the structural response of tapered CFST columns under non-uniform confinement leading to potential advancements in their design and application.</p>

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Tapered concrete in-filled steel tubular columns under axial compression

  • 期刊论文

  • 发表日期：

    2025年5月5日

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  • Antony Raj Thambu Samy,
  • Jane Helena Henderson

摘要

Concrete in-filled tapered steel tubular columns have gained widespread popularity due to reduced material usage while maintaining structural integrity. To comprehensively investigate their performance and behavior both experimental investigation and an extensive numerical analysis was carried out using the finite element analysis software, ABAQUS 2020. The varying confining pressure along the length of the column is determined by numerical analysis. An equation to predict the confining pressure is also proposed. A Parametric study covering a wide range of column heights: 600 mm, 1200 mm, and 1500 mm, each with varying taper angles of 0° to 3° has been carried out. A crucial aspect examined in the study is the interaction between the steel tube and concrete in-fill, with careful consideration of normal and tangential behavior, frictional parameters, and contact surface properties. This investigation also takes into careful consideration key parameters such as base diameter to thickness ratio (Db/t ranging from 33.33 to 100), Length to base diameter ratio (L/Db ranging from 3 to 9), and Strength to weight ratio(S/W). This study aims to provide a deeper insight into the structural response of tapered CFST columns under non-uniform confinement leading to potential advancements in their design and application.