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Steel and Composite Structures
  Volume 8, Number 5, October 2008, pages 423-438

Experimental tests on biaxially loaded concrete-encased composite columns
Serkan Tokgoz and Cengiz Dundar

    This paper reports an experimental investigation of the behaviour of concrete-encased composite columns subjected to short-term axial load and biaxial bending. In the study, six square and four L-shaped cross section of both short and slender composite column specimens were constructed and tested to examine the load-deflection behaviour and to obtain load carrying capacities. The main variables in the tests were considered as eccentricity of applied axial load, concrete compressive strength, cross section, and slenderness effect. A theoretical procedure considering the nonlinear behaviour of the materials is proposed for determination of the behaviour of eccentrically loaded short and slender composite columns. Two approaches are taken into account to describe the flexural rigidity (EI) used in the analysis of slender composite columns. Observed failure mode and experimental and theoretical load-deflection behaviour of the specimens are presented in the paper. The composite column specimens and also some composite columns available in the literature have been analysed and found to be in good agreement with the test results.
Key Words
    composite column; biaxial bending; slenderness effect; ultimate strength; flexural rigidity.
Serkan Tokgoz : Assist. Professor of Civil Engineering Mersin University 33340 Mersin, Turkey
Cengiz Dundar : Professor of Civil Engineering Cukurova University 01330 Adana, Turkey

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