Uni-axial behaviour of normal-strength concrete-filledsteel-tube columns with external confinement

Ho, J.C.M. and Luo, L. (2012) Uni-axial behaviour of normal-strength concrete-filledsteel-tube columns with external confinement. Earthquake and Structures, 3 6: 889-910.

Author Ho, J.C.M.
Luo, L.
Title Uni-axial behaviour of normal-strength concrete-filledsteel-tube columns with external confinement
Journal name Earthquake and Structures
ISSN 2092-7614
Publication date 2012
Year available 2012
Sub-type Article (original research)
Open Access Status
Volume 3
Issue 6
Start page 889
End page 910
Total pages 22
Place of publication Daejeon, Korea, Republic of
Publisher Techno-Press
Collection year 2012
Language eng
Formatted abstract
Because of the heavy demand of confining steel to restore the column ductility in seismic regions, it is more efficient to confine these columns by hollow steel tube to form concrete-filled-steeltube (CFST) column. Compared with transverse reinforcing steel, steel tube provides a stronger and more uniform confining pressure to the concrete core, and reduces the steel congestion problem for better concrete placing quality. However, a major shortcoming of CFST columns is the imperfect steel-concrete interface bonding occurred at the elastic stage as steel dilates more than concrete in compression. This adversely affects the confining effect and decrease the elastic modulus. To resolve the problem, it is proposed in this study to use external steel confinement in the forms of rings and ties to restrict the dilation of steel tube. For verification, a series of uni-axial compression test was performed on some CFST columns with external steel rings and ties. From the results, it was found that: (1) Both rings and ties improved the stiffness of the CFST columns and (2) the rings improve significantly the axial strength of the CFST columns while the ties did not improve the axial strength. Lastly, a theoretical model for predicting the axial strength of confined CFST columns will be developed.
Keyword Columns
Concrete filled steel tube (CFST)
External confinement
Normal strength concrete
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Civil Engineering Publications
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Created: Thu, 23 Oct 2014, 17:29:27 EST by Johnny Ho on behalf of School of Civil Engineering