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Steel and Composite Structures
  Volume 11, Number 6, December 2011 , pages 469-488

The behavior of lightweight aggregate concrete filled steel tube columns under eccentric loading
Elzien Abdelgadir, Ji Bohai, Fu Zhongqiu and Hu Zhengqing

    This paper consists of two parts; the first part describes the laboratory work concerning the behavior of lightweight aggregate concrete filled steel tubes (LACFT). Based on eccentricity tests, fifty-four specimens with different slenderness ratios (L/D= 3, 7, and 14) were tested. The main parameters varied in the test are: load eccentricity; steel ratio; and slenderness ratio. The standard load-strain curves of LACFT columns under eccentric loading were summarized and significant parameters affecting LACFT column\'s bearing capacity, failure mechanism and failure mode such as confinement effect and bond strength were all studied and analyzed through the comparison with predicted strength of concrete filled steel tube columns (CFT) using the existing codes such as AISC-LRFD (1999), CHN DBJ 13-51-2003 (2003) and CHN CECS 28:90 (1990). The second part of this paper presents the results of parametric study and introduces a practical and accurate method for determination of the maximum compressive strength of confined concrete core ( fmax), In addition to, the study of the effect of aspect-ratio and length-width ratio on the yield stress of steel tubes ( fsy) under biaxial state of stress in CFT columns and the effect of these two factors on the ultimate load carrying capacity of axially loaded CFT/LACFT columns.
Key Words
    lightweight aggregate concrete filled steel tube; load eccentricity; steel ratio; slenderness ratio; ultimate bearing capacity; composite construction
College of Civil Engineering, Hohai University, Nanjing 210098, China

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