Confinement effect of ring-confined concrete-filled-steel-tube columns under uni-axial load

Lai, M. H. and Ho, J. C. M. (2014) Confinement effect of ring-confined concrete-filled-steel-tube columns under uni-axial load. Engineering Structures, 67 123-141. doi:10.1016/j.engstruct.2014.02.013

Author Lai, M. H.
Ho, J. C. M.
Title Confinement effect of ring-confined concrete-filled-steel-tube columns under uni-axial load
Journal name Engineering Structures   Check publisher's open access policy
ISSN 0141-0296
Publication date 2014-05-15
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.engstruct.2014.02.013
Open Access Status Not Open Access
Volume 67
Start page 123
End page 141
Total pages 19
Place of publication Oxford, United Kingdom
Publisher Pergamon Press
Language eng
Formatted abstract
Concrete-filled-steel-tube (CFST) columns show superior strength and ductility performance because of composite action. However, this cannot be fully developed at early elastic stage as steel dilates more than concrete and thereby causing imperfect interface bonding, which reduces the elastic strength and stiffness. To resolve the problem, confinement in the form of rings is proposed in this study to restrict the elastic lateral dilation of concrete. For verification, 62 CFST columns of various dimensions cast with normal-(NSC) or high-strength concrete (HSC) installed with rings were tested under uni-axial compression in this study. From the results, it was evident that: (1) Rings could improve the axial load-carrying capacity, stiffness and decrease the strength degradation rate. (2) The critical confinement index (ξcr) was varied with concrete grade. (3) Rings were effective to limit the lateral deformation of concrete and the steel tube. Based on the obtained results, three analytical models taking into account the confining effects provided by the steel tube and rings developed by the authors are proposed to estimate the axial load-carrying capacity of unconfined and ring-confined CFST columns. The validity of the best proposed model is justified by comparing the predicted theoretical strength with the measured strength in the tests and experimental results by other researchers.
Keyword Analytical model
Confinement effect
External rings
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 2015 Collection
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