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<p>Confined composite sections under compression are increasingly popular, as they protect the core material under extreme environment, while also enhancing both the stability of the structural system and its architectural aesthetics. This study examines steel–concrete composite box sections, using welded lipped cold-formed channel C-sections as confinement to reinforced concrete stub columns under axial compression, emphasizing improved interaction and bonding effect. Twenty-four samples having a square cross-section of side 140&#xa0;mm, with height 500&#xa0;mm and 700&#xa0;mm were cast using M30 and M40 grade of concrete. They were further tested in a computerized servo-hydraulic compression machine to conduct parametric studies e.g. peak load, axial load-shortening behavior, concrete bonding, confinement effect, slenderness ratio, the effect of infilled concrete grade, ductility index and failure pattern of specimens. Confined samples failed at higher peak load causing bulging of confinement leading to tearing of confining steel and weld failure in some cases. Although the use of cold-formed steel in structural application is limited due to their inherent local buckling, the lipped channel C-sections used in this investigation illustrate that such cold-formed composite confinement enhances the load-carrying capacity of the unconfined samples or bare reinforced columns by 1.95 times, with reduced axial shortening and different failure patterns. The predictions of the ultimate load of the stub columns were compared with the available provisions of various international codes of practice for confined sections. Considering the experimental peak load and in line with various codal stipulations, a generalized equation is proposed to predict the load-carrying capacity of similar composite sections with cold-formed steel using response surface methodology (RSM). </p>

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Investigation on Lipped Cold-Formed Steel Built-Up Box Section Infilled with Reinforced Concrete Under Axial Compression

  • 期刊论文

  • 发表日期：

    2025年7月13日

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  • Pranoy Roy,
  • V. R. Konam,
  • Amiya K. Samanta

摘要

Confined composite sections under compression are increasingly popular, as they protect the core material under extreme environment, while also enhancing both the stability of the structural system and its architectural aesthetics. This study examines steel–concrete composite box sections, using welded lipped cold-formed channel C-sections as confinement to reinforced concrete stub columns under axial compression, emphasizing improved interaction and bonding effect. Twenty-four samples having a square cross-section of side 140 mm, with height 500 mm and 700 mm were cast using M30 and M40 grade of concrete. They were further tested in a computerized servo-hydraulic compression machine to conduct parametric studies e.g. peak load, axial load-shortening behavior, concrete bonding, confinement effect, slenderness ratio, the effect of infilled concrete grade, ductility index and failure pattern of specimens. Confined samples failed at higher peak load causing bulging of confinement leading to tearing of confining steel and weld failure in some cases. Although the use of cold-formed steel in structural application is limited due to their inherent local buckling, the lipped channel C-sections used in this investigation illustrate that such cold-formed composite confinement enhances the load-carrying capacity of the unconfined samples or bare reinforced columns by 1.95 times, with reduced axial shortening and different failure patterns. The predictions of the ultimate load of the stub columns were compared with the available provisions of various international codes of practice for confined sections. Considering the experimental peak load and in line with various codal stipulations, a generalized equation is proposed to predict the load-carrying capacity of similar composite sections with cold-formed steel using response surface methodology (RSM).