Evaluation of Local, Distortional, and Post Buckling Strength of Ultra Thin and Light Steel Members

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K14865
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 23010:Building structures and materials-related
• Research Institution: Mie University
• Principal Investigator: Sato Kosuke 三重大学, 工学研究科, 准教授 (50788510)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 薄板軽量形鋼 / 角形鋼管 / リップ溝形鋼 / 弾性座屈耐力 / 応力再配分 / 座屈後最大耐力 / せん断曲げ相互作用 / 板要素連成効果

Outline of Final Research Achievements

In this study, ultra thin and light cold formed rectangular steel tube and lipped channel steel members with plate thickness of less than 2.3 mm are targeted. The elastic local buckling of plate elements, distortional buckling strength, and ultimate strength with strength increase due to stress redistribution of post buckling which determine the large deformation behavior are investigated by theoretical analysis, numerical analysis, and structural testing. The buckling strength and post buckling strength are reasonably evaluated including the effects of loading conditions and member shapes which have not been sufficiently considered.

Free Research Field

建築構造

Academic Significance and Societal Importance of the Research Achievements

本研究では，これまで十分に検討されていない薄板軽量形鋼部材の座屈耐力と座屈後耐力に及ぼすせん断曲げ相互作用と板要素連成効果の影響を明らかにし，曲げモーメント勾配と幅厚比と断面及び板要素辺長比に応じた簡便で精度の高い近似式を提案した．現行の構造設計法は板要素の応力状態と境界条件が単純にされた座屈耐力と座屈後耐力に基づいているが，本研究ではより実際に近い現象を扱っており，その成果は今後の座屈設計法の合理化に貢献するものと考えられる．