Improving strength, stiffness and ductility of CFDST columns by external confinement

Ho, J. C. M. and Dong, C. X. (2014) Improving strength, stiffness and ductility of CFDST columns by external confinement. Thin-Walled Structures, 75 18-29. doi:10.1016/j.tws.2013.10.009


Author Ho, J. C. M.
Dong, C. X.
Title Improving strength, stiffness and ductility of CFDST columns by external confinement
Journal name Thin-Walled Structures   Check publisher's open access policy
ISSN 0263-8231
1879-3223
Publication date 2014-01-01
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.tws.2013.10.009
Volume 75
Start page 18
End page 29
Total pages 12
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Language eng
Subject 2210 Mechanical Engineering
2215 Building and Construction
2205 Civil and Structural Engineering
Abstract Concrete-filled double-skin tubular (CFDST) column is one of the most efficient forms of column construction in which the steel tubes provides both axial strength and confining pressure to enhance the strength and ductility of the in-filled concrete. Compared with confined reinforced concrete columns, CFDST columns had stronger and more uniform confining pressure provided to the in-filled concrete by the steel tubes, which reduces the steel congestion problem for better concrete placing quality. However, a major shortcoming of the CFDST columns is the imperfect interface bonding that occurred at the elastic stage that reduces the elastic strength and stiffness of columns. To improve the situation, it is proposed in this study to use external steel rings to restrict the dilation of outer steel tube of CFDST columns. For verification, a series of uni-axial compression test was performed on some CFDST columns with external steel rings. From the results, it was found that the elastic strength, elastic stiffness and ductility were enhanced by installing the steel rings as external confinement. Lastly, a theoretical model for predicting the axial strength of confined CFDST columns has been developed.
Keyword Columns
Concrete-filled
Double-skin tubular
External confinement
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 2014 Collection
 
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