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Steel and Composite Structures
  Volume 4, Number 3, June 2004 , pages 169-188

Behavior and calculation on concrete-filled steel CHS (Circular Hollow Section) beam-columns
Lin-Hai Han, Guo-Huang Yao and Xiao-Ling Zhao

    A mechanics model is developed in this paper for concrete-filled steel CHS (circular hollow section) beam-columns. A unified theory is described where a confinement factor (ξ) is introduced to describe the composite action between the steel tube and the filled concrete. The predicted load versus deformation relationship is in good agreement with test results. The theoretical model was used to investigate the influence of important parameters that determine the ultimate strength of concrete-filled steel CHS beam-columns. The parametric and experimental studies provide information for the development of formulas for the calculation of the ultimate strength of the composite beam-columns. Comparisons are made with predicted beam-columns strengths using the existing codes, such as LRFD-AISC-1999, AIJ-1997, BS5400-1979 and EC4-1994.
Key Words
    composite columns; beam-columns; composite actions; constraining factor; concrete; design; hollow sections; columns; member capacity.
Lin-Hai Han and Guo-Huang Yao;rnCollege of Civil Engineering and Architecture, Fuzhou University, Gongye Road 523, Fuzhou, Fujian, Province, 350002, P. R. ChinarnXiao-Ling Zhao; rnDepartment of Civil Engineering, Monash University, Clayton, VIC 3168, Australia

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