Techno Press
Techno Press

Steel and Composite Structures   Volume 7, Number 2, April 2007, pages 135-160
DOI: http://dx.doi.org/10.12989/scs.2007.7.2.135
 
Capacity and the moment-curvature relationship of high-strength concrete filled steel tube columns under eccentric loads
Seung-Jo Lee

 
Abstract     [Full Text]
    Recently, CFT column has been well-studied and reported on, because a CFT column has certain superior structural properties as well as good productivity, execution efficiency, and improved rigidity over existing columns. However, CFT column still has problems clearing the capacity evaluation between its steel tube member and high-strength concrete materials. Also, research on concrete has examined numerical values for high-strength concrete filled steel square tube columns (HCFT) to explain transformation performance (M-f) when a short-column receives equal flexure-moment from axial stress. Moment-curvature formulas are proposed for HCFT columns based on analytic assumption described in this paper. This study investigated structural properties (capacity, curvature), through a series of experiments for HCFT with key parameters, such as strength of concrete mixed design (58.8 MPa), width-thickness ratio (D/t), buckling length to sectional width ratio (Lk/D) and concrete types (Zeolite, Fly-ash, Silica-fume) under eccentric loads. A comparative analysis executed for the AISC-LRFD, AIJ and Takanori Sato, etc. Design formulas to estimate the axial load (N)-moment (M)-curvature (f) are proposed for HCFT columns based on tests results described in this paper.
 
Key Words
    high-strength concrete filled steel square tube column; D/t ratio; buckling length to sectional ratio; eccentric ratio; axial load capacity ratio; curvature; ductility.
 
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