Safety Evaluation of Cruciform Columns Corrected by Heating(Mechanics, Strength & Structural Design)

概要

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In the Hanshin-Awaji earthquake (1995), many members of large steel structures were damaged. After the earthquake, the local buckling deformations of many members were rapidly corrected by heating and pressing. However, when correcting large deformation like buckling, the effects of heating correction on strength of members are unknown. So it is necessary to confirm the safety and reliability of members corrected by heating. In this paper, a series of compressive tests of virgin specimens and ones corrected by heating was carried out. From the experimental results, the effects of heating correction on the strength of members were investigated, and safety evaluation of columns corrected by heating was performed. According to the results, buckling deformation modes of specimens corrected by heating were variously changed. The causes were residual imperfections and the increase of strength through work hardening. However, the ultimate strength of specimens corrected by heating was almost equal to that of virgin specimens.
大阪大学の論文