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Design Equation for Square CFT Columns with Large Width-to-Thickness Ratio  

Kim, Sun Hee (서울시립대학교 구조연구실)
Choi, Young Whan (서울시립대학교)
Choi, Sung Mo (서울시립대학교 건축학부)
Publication Information
Journal of Korean Society of Steel Construction / v.21, no.5, 2009 , pp. 537-544 More about this Journal
Abstract
The design standards, such as AISC-LRFD (2005) and KBC-2005, specify the maximum width-to-thickness ratio that can be used for computing the strength of the concrete-filled tube (CFT), and do not include any formula for computing the strength when the width-to-thickness ratio is over the limit. This paper proposes a strength equation for CFTs with a large width-to-thickness ratio by acknowledging the fact that the stiffened slender steel platehas substantial postbuckling strength, and that it therefore can be more economical to use it. The equation adopts the concept of effective width,which is very useful for plate analysis. By comparing the strengths of AISC2005, KBC2005, and the proposed method with the results of the experiment, where the width-to-thickness ratio was regarded as the main parameter, the applicability of the proposed method was verified.
Keywords
square CFTs; stub columns; width-to-thickness ratio; effective width; design strength;
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Times Cited By KSCI : 1  (Citation Analysis)
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