Axial strengthening of thin-walled concrete-filled-steel-tube columns by circular steel jackets

Lai, M. H. and Ho, J. C. M. (2015) Axial strengthening of thin-walled concrete-filled-steel-tube columns by circular steel jackets. Thin-Walled Structures, 97 11-21. doi:10.1016/j.tws.2015.09.002

Author Lai, M. H.
Ho, J. C. M.
Title Axial strengthening of thin-walled concrete-filled-steel-tube columns by circular steel jackets
Journal name Thin-Walled Structures   Check publisher's open access policy
ISSN 0263-8231
Publication date 2015-12-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.tws.2015.09.002
Open Access Status Not Open Access
Volume 97
Start page 11
End page 21
Total pages 11
Place of publication Kidlington, Oxford United Kingdom
Publisher Pergamon Press
Language eng
Subject 2210 Mechanical Engineering
2215 Building and Construction
2205 Civil and Structural Engineering
Abstract External confinement in the form of steel rings, tie bars, spirals and FRP wraps has been widely adopted for strengthening concrete-filled-steel-tube (CFST) columns. Previous experimental and theoretical studies have proved that it can improve the strength, elastic stiffness, ductility and interface bonding of CFST columns. However, in real engineering practise, CFST columns need to be strengthened are usually under pre-compressed axial load. The stress-lagging effect between the CFST columns and external confinement due to pre-loading has not yet been justified. In this paper, external confinement in the form of circular steel jacket is proposed to improve the uni-axial behaviour of CFST columns with and without pre-compressed axial load. An experimental study, consisting of 5 hollow-steel-tubes and 10 thin-walled CFST columns was conducted to examine the effectiveness of the proposed strengthening scheme. The main parameters were the concrete cylinder strength, jacket spacing and pre-compressed axial load level. Test results revealed that the steel jacket could improve the uni-axial behaviour of CFST columns and the stress-lagging could degrade this beneficial effect. In addition, a theoretical model developed by the authors previously was adopted to predict the uni-axial behaviour of the strengthening columns. Very good agreement has been obtained between the theoretical and experimental results.
Keyword Concrete-filled-steel-tube
Steel jackets
Thin-walled structure
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2016 Collection
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