Optimal design of external rings for confined CFST columns

Lai, M. H. and Ho, J. C. M. (2015) Optimal design of external rings for confined CFST columns. Magazine of Concrete Research, 67 19: 1017-1032. doi:10.1680/macr.14.00348

Author Lai, M. H.
Ho, J. C. M.
Title Optimal design of external rings for confined CFST columns
Journal name Magazine of Concrete Research   Check publisher's open access policy
ISSN 0024-9831
Publication date 2015-10-01
Year available 2015
Sub-type Article (original research)
DOI 10.1680/macr.14.00348
Open Access Status DOI
Volume 67
Issue 19
Start page 1017
End page 1032
Total pages 16
Place of publication London, United Kingdom
Publisher I C E Publishing
Language eng
Formatted abstract
Concrete-filled steel tube (CFST) columns are becoming increasingly popular in the construction of tall buildings due to their superior behaviour contributed by composite action. However, this composite action cannot be fully developed owing to the imperfect steel–concrete interface bonding that occurs in the elastic stage. To overcome this problem, external rings were adopted in this study. To further improve the efficiency of external rings, different configurations of steel rings were tested. In this study, 18 CFST columns with different concrete cylinder strengths and configurations of rings were tested under uniaxial load. The experimental results reveal that: rings can improve the strength, elastic stiffness and ductility of CFST columns; denser rings arranged near the mid-height can improve the uniaxial behaviour of CFST columns more effectively; external rings can restrain the lateral dilation of steel tube and concrete in the early elastic stage. Based on the experimental results, an analytical model, taking into account the confinement effect and ring configurations, is proposed to estimate the ultimate strength of CFST columns. The validity of the model was checked by comparing the predicted strengths with experimental strengths from this study and the authors' previous experimental results.
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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Citation counts: TR Web of Science Citation Count  Cited 5 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 7 times in Scopus Article | Citations
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