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P-M Interaction Curve for Square CFTs with High-Strength Concrete  

Choi, Young Hwan (서울시립대학교 건축공학과)
Kim, Kang Su (서울시립대학교 건축공학과)
Choi, Sung Mo (서울시립대학교 건축공학과)
Lee, Sangsup (한국건설기술연구원 건축구조.재료 연구실)
Publication Information
Journal of Korean Society of Steel Construction / v.19, no.6, 2007 , pp. 575-585 More about this Journal
Abstract
In this study, a new design equation was presented for square CFTs with high-strength concrete subjected to axial compression and bending. In a previous study, a design equation for square CFTs with normal strength concrete was proposed. A parametric study by fiber analysis was performed taking the width-to-thickness ratio (b/t) and the relative concrete strength to the yield strength of the steel tube (fck/Fy) as the main parameters of this study to determine the maximum moment and the axial load at the maximum moment. A new constitutive model for concrete was adopted for fiber analysis in order to take into account the effect of high-strength concrete. The results of the parametric study were embedded into the method which was presented in the previous study to formulate a new design equation that can be easily used for estimating the strength of square CFTs with high-strength concrete.
Keywords
high-strength concrete; CFT; beam-column; Interaction Curve; Fiber Analysis;
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