To study the properties of various steel-pipe combined columns, ten steel pipe combined columns were designed, including five axial compression specimens and five eccentric compression specimens. The test mainly investigated the influence of the combination of a flange steel pipe and web steel pipe on the combined column, including the overall failure mode, local failure mode, load-displacement curve, bearing capacity, and stability of the flange steel pipe and web steel pipes. The test results showed that the overall and local failure modes of the axial compression specimens with different steel pipe combinations were different. The failure modes of the eccentric compression specimens with different steel pipe combinations were almost identical. Except for the eccentric compression specimen PZH2, none of the other eccentric compression specimens exhibited local buckling. The combination of the flange steel pipes and web steel pipes near the flange steel pipes had an obviously effect on the bearing capacity, while the combination of steel pipes in the middle of the web had a lower effect on the bearing capacity. During the loading process, the flange and web steel pipe did not lose stability, and the weld between the steel pipes of the axial compression specimen and the eccentric compression specimen was not damaged. There was no obvious separation between the unwelded parts of the steel pipes.
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