Static behavior of T-shaped concrete-filled steel tubular columns subjected to concentric and eccentric compressive loads

• The T-shaped CFST columns were tested subjected to concentric compressive load and eccentric compressive load.
• The buckling strength of steel tubes can be enhanced by adding tensile bars.
• The resistance and ductility of specimens can be improved by adding tensile bars.
• A numerical modeling program was developed with proposed distribution of confined concrete and buckling strength of stiffened steel tube.

In this paper, a batch of T-shaped concrete-filled steel tubular (CFST) columns, T-shaped steel tube confined concrete (STCC) columns and T-shaped reinforced concrete (RC) counterparts were tested subjected to concentric compressive load or eccentric compressive load. The battlement-shaped bar and tensile bar were developed as stiffeners to delay local buckling in tube wall. The stiffening mechanism, the failure modes of concrete and steel tubes, the strength and ductility of specimens were investigated in detail during the experimental research. A numerical modeling program was developed and verified against the experimental data. The numerical program, which incorporates the effect of the stiffeners on postponing local buckling of the tube and the confinement of the tube on concrete core, was used to carry out comprehensive parametric analysis of influencing factors on the structural behavior of T-shaped CFST columns.

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