Axial and lateral stress-strain model for circular concrete-filled steel tubes with external steel confinement

Kwan, A. K. H., Dong, C. X. and Ho, J. C. M. (2016) Axial and lateral stress-strain model for circular concrete-filled steel tubes with external steel confinement. Engineering Structures, 117 528-541. doi:10.1016/j.engstruct.2016.03.026


Author Kwan, A. K. H.
Dong, C. X.
Ho, J. C. M.
Title Axial and lateral stress-strain model for circular concrete-filled steel tubes with external steel confinement
Journal name Engineering Structures   Check publisher's open access policy
ISSN 1873-7323
0141-0296
Publication date 2016-06-15
Sub-type Article (original research)
DOI 10.1016/j.engstruct.2016.03.026
Open Access Status
Volume 117
Start page 528
End page 541
Total pages 14
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Language eng
Abstract In a concrete-filled steel tube, delamination often occurs at the steel tube-concrete core interface due to the larger Poisson's ratio of the steel tube. For resolving this problem, it has been advocated to install external restraints in the form of steel rings or spirals so as to restrain the lateral expansion of the steel tube. This also provides additional confinement to the concrete core. To study the effectiveness of such external steel confinement, a theoretical model for evaluating the confining stress and axial load in a concrete-filled steel tube with external steel confinement up to the post-peak stage is developed. The theoretical model is first verified by analyzing a total of 98 specimens tested by previous researchers and comparing the measured and predicted lateral strain-axial strain curves and axial load-strain curves of the specimens. It is then used to perform a parametric study to evaluate the required equivalent thickness/diameter ratios of the external steel confinement for eliminating the delamination effect and for achieving Level I ductility.
Keyword Concrete confinement
Concrete-filled steel tube
Confining stress
External steel confinement
Lateral strain of concrete
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

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