Experimental and theoretical studies of confined HSCFST columns under uni-axial compression

Lai, M. H. and Ho, J. C. M. (2014) Experimental and theoretical studies of confined HSCFST columns under uni-axial compression. Earthquake and Structures, 7 4: 527-552. doi:10.12989/eas.2014.7.4.527


Author Lai, M. H.
Ho, J. C. M.
Title Experimental and theoretical studies of confined HSCFST columns under uni-axial compression
Journal name Earthquake and Structures
ISSN 2092-7614
2092-7622
Publication date 2014-01-01
Year available 2014
Sub-type Article (original research)
DOI 10.12989/eas.2014.7.4.527
Open Access Status
Volume 7
Issue 4
Start page 527
End page 552
Total pages 26
Place of publication Daejeon, Korea, Republic of
Publisher Techno Press
Language eng
Formatted abstract
he development of modern concrete technology makes it much easier to produce high-strength concrete (HSC) or ultra-high-strength concrete (UHSC) with high workability. However, the application of this concrete is limited in practical construction of traditional reinforced concrete (RC) structures due to low-ductility performance. To further push up the limit of the design concrete strength, concrete-filled-steel-tube (CFST) columns have been recommended considering its superior strength and ductility performance. However, the beneficial composite action cannot be fully developed at early elastic stage as steel dilates more than concrete and thereby reducing the elastic strength and stiffness of the CFST columns. To resolve this problem, external confinement in the form of steel rings is proposed in this study to restrict the lateral dilation of concrete and steel. In this paper, a total of 29 high-strength CFST (HSCFST) columns of various dimensions cast with concrete strength of 75 to 120 MPa concrete and installed with external steel rings were tested under uni-axial compression. From the results, it can be concluded that the proposed ring installation can further improve both strength and ductility of HSCFST columns by restricting the column dilation. Lastly, an analytical model calculating the uni-axial strength of ring-confined HSCFST columns is proposed and verified based on the Von-Mises and Mohr-Coulomb failure criteria for steel tube and in-filled concrete, respectively.
Keyword Analytical model
Concrete filled steel tube (CFST)
High strength concrete
Mohr coulomb
Von mises
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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