Hassanein, MF;
Jiang, Song-qi;
Shao, Yong-Bo;
Cashell, KA;
(2025)
Behaviour and design of square cold-formed concrete-filled double-skin stiffened slender columns.
Engineering Structures
, 338
, Article 120583. 10.1016/j.engstruct.2025.120583.
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Abstract
Concrete-filled double-skin stiffened steel tubular (CFD-SSST) slender columns with a square inner tube, a cold-formed stiffened outer tube, and concrete infill between the two steel sections are examined in this paper. To the best of the authors' knowledge, while the behaviour of short columns has been investigated, the behaviour of these kinds of slender columns has not. As a result, a finite element model has been development and its details are provided, along with a validation against test data that is currently available. An extensive parametric study is conducted using the model to investigate the behaviour of CFD-SSST slender columns with varying geometric and material properties. A technique for defining intermediate-length and long columns is suggested based on an examination of the strain distributions in the cross-section. It is demonstrated that the slenderness ratio, which influences both the failure mode and the capacity, is a crucial parameter in the behaviour of CFD-SSST columns. The yield strength of the outer steel tube, the strength of the sandwiched concrete, and the width-to-thickness ratio of the outer tube are all found to be significant factors for intermediate-length columns, but only the former is found to have a significant impact on long columns. Because there is currently a lack of specific guidance, the final strengths are compared with several design approaches that were appropriately modified to account for different components forming the cross-section of CFD-SSST slender columns. The design model by AS/NZS 2327 standard (2017) was found to provide well the strengths of CFD-SSST slender columns, and therefore recommended for design.
| Type: | Article |
|---|---|
| Title: | Behaviour and design of square cold-formed concrete-filled double-skin stiffened slender columns |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.engstruct.2025.120583 |
| Publisher version: | https://doi.org/10.1016/j.engstruct.2025.120583 |
| Language: | English |
| Additional information: | © 2025 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
| Keywords: | Concrete-filled tube, Double-skin, Stiffened tube, Axial compression, Finite element analysis, Design method |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10214863 |
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