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Steel and Composite Structures
  Volume 6, Number 1, February 2006 , pages 55-69

Experimental study on partially concrete-filled steel tubular columns
T. Ishizawa, T. Nakano and M. Iura

    The results of tests conducted on 11 concrete-filled steel tubular columns were reported. Concrete was partially filled in circular steel tubular columns. The primary test parameters were radius and thickness of steel tubes, concrete height, loading patterns and attachment of diaphragm and studs. Concrete strain was measured directly by embedding strain gauges so that the effect of diaphragm on concrete confinement could be investigated. The effects of concrete height and diaphragm on ultimate strength and ductility of steel tubes were investigated. The comparisons of the test results with the existing results for rectangular cross-sections were made on the basis of ultimate strength and ductility of concrete-filled steel tubular columns.
Key Words
    composite columns (concrete and steel); ductility; inelastic buckling; cyclic loading; PCFST columns.
Department of Civil and Environmental Engineering, Tokyo Denki University, Hatoyama, Hiki, Saitama, Japan

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