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Steel and Composite Structures
  Volume 1, Number 3, September 2001 , pages 313-328

Confinement evaluation of concrete-filled box-shaped steel columns
K.A.S. Susantha, Hanbin Ge and Tsutomu Usami(Japan)

    This paper presents a three-dimensional finite element analysis methodology for a quantitativernevaluation of confinement in concrete-filled box-shaped unstiffened steel columns. The confinement effectsrnof concrete in non-circular sections can be assessed in terms of maximum average lateral pressure. A briefrnreview of a previous method adopted for the same purpose is also presented. The previous method is based onrna two-dimensional finite element analysis method involving a concrete-steel interaction model. In both thernpresent and previous methods, average lateral pressure on concrete is computed by means of the interactionrnforces present at the concrete-steel interface. Subsequently, the strength enhancement of confined concrete isrnempirically related to the maximum average lateral pressure. The results of the former and latter methods arernthen compared. It is found that the results of both methods are compatible in terms of confined concreternstrengths, although the interaction model yields a somewhat overestimated estimation of confinement thanrnthose of the present method when relatively high strength concrete is used. Furthermore, the confinement inrnrectangular-shaped sections is investigated and the reliability of previously adopted simplifications in suchrncases is discussed.
Key Words
    concrete-filled tubes; box-shaped CFT columns; confinement; confined concrete; concrete-steel interface; composite action.
K.A.S. Susantha, Hanbin Ge and Tsutomu Usami, Department of Civil Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan

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