Behavior of partial-length stiffened and full-length stiffened CFDST columns under axial load
ISSN: 1708-5284
Article publication date: 2 March 2023
Issue publication date: 26 April 2024
Abstract
Purpose
Concrete-filled double skin tube (CFDST) columns are considered one of the most effective steel-concrete composite sections owing to the higher load carrying capacity as compared to its counterpart concrete-filled tube (CFT) columns. This paper aims to numerically investigate the performance of axially loaded, circular CFDST short columns, with the innovative strengthening technique of providing stiffeners in outer tubes. Circular steel hollow sections have been adopted for inner as well as outer tubes, while varying the length of rectangular steel stiffeners, fixed inside the outer tubes only, to check the effect of stiffeners in partially and full-length stiffened CFDST columns.
Design/methodology/approach
The behaviour of these CFDST columns is investigated numerically by using a verified finite element analysis (FEA) model from the ABAQUS. The behaviour of 20-unstiffened, 80-partially stiffened and 20-full-length stiffened CFDST columns is studied, while varying the strength of steel (fyo = 250–750 MPa) and concrete (30–90 MPa).
Findings
The FEA results are verified by comparing them with the previous test results. FEA study has exhibited that, there is a 7%–25% and 39%–49% increase in peak-loads in partially stiffened and full-length stiffened CFDST columns, respectively, compared to unstiffened CFDST columns.
Originality/value
Enhanced strength has been observed in partially stiffened and full-length stiffened CFDST columns as compared to unstiffened CFDST columns. Also, a significant effect of strength of concrete has not been observed as compared to the strength of steel.
Keywords
Acknowledgements
Funding: The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.
Competing Interests: The authors have no relevant financial or non-financial interests to disclose.
Author Contributions: All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Aamir Hassan and Javed Ahmad Bhat. The first draft of the manuscript was written by Aamir Hassan and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
Data Availability Statement: All data, models and code generated or used during the study appear in the submitted article.
Citation
Hassan, A. and Bhat, J.A. (2024), "Behavior of partial-length stiffened and full-length stiffened CFDST columns under axial load", World Journal of Engineering, Vol. 21 No. 3, pp. 455-474. https://doi.org/10.1108/WJE-09-2022-0370
Publisher
:Emerald Publishing Limited
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