初期不整が軸方向圧縮力と一端単調曲げモーメントを受ける角形鋼管柱の弾塑性挙動に与える影響

摘要

Imperfections that will be introduced in the member are inevitable due to the manufacturing process. However, effect of the initial imperfection on elasto-plastic behavior of square steel tubular columns under compressive axial force with bending moment is not clarified. In this paper, the effect of independent initial imperfection (e.g. initial global imperfection, initial local imperfection or residual stress) on elasto-plastic performance is investigated. Moreover, the effect of composite initial imperfection is investigated. It is shown that initial local imperfection has a significant impact on elasto-plastic performance. Validation of the numerical simulation were also performed and recommended values of imperfections are shown.%本論文では幾何学的·材料的な初期不整が軸方向圧縮力と一端単調曲げモーメントを受ける角形鋼管柱の最大曲けモーメント，塑性変形能力および変形性状に与える影響を把握するための有限要素法大変形解析を実施した.まず，幾何学的·材料的な初期不整を単独 で導入した解析において得られた知見を述べる.