Abstract
This paper is concerned with a compressive experiment on carbon steel thin walled square pipes with a square hole in a short column range, supported by spherical seats. Collapse of these carbon steel square pipes occurred as the local buckling of the flat wall with a square hole. It was found that the buckling stress decreased as the opening ratio increased. Consideration has been given to the formula and the diagram wich are the combination of the analysis based on the energy method and the experimental result. The measurement results show that the formula and the diagram are in good design data, and are in good agreement with those obtained experimentally for a short column range.
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