Stability evaluation methods for steel structural members and rational design methods as their applications

2023 Fiscal Year Final Research Report

• Project/Area Number: 20H02294
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 23010:Building structures and materials-related
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Ikarashi Kikuo 東京工業大学, 環境・社会理工学院, 教授 (40242292)
• Co-Investigator(Kenkyū-buntansha): 三井 和也 東京工業大学, 環境・社会理工学院, 助教 (60862224)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 建築構造 / 鋼構造 / 部材 / 安定性 / 統一的性能評価

Outline of Final Research Achievements

This study aimed to develop a unified stability evaluation method in order to improve the design system leading to clarification and rationalization of design activities for steel structures. The conclusions obtained are as follows;
1) A new formula for evaluating the maximum strength of asymmetric cross-section members and assembled members subjected to tensile forces was developed. 2) The buckling strength and maximum strength of asymmetric cross-section members subjected to compressive forces were clarified. 3) The possibility of thinning beam-column connections and their stability were investigated. 4) The cyclic behavior of square steel tube members taking into account material properties was clarified, and a formula for evaluating mechanical performance was developed. 5) The results so far have shown that rational design can be carried out using the new stability evaluation method.

Free Research Field

建築構造・鋼構造

Academic Significance and Societal Importance of the Research Achievements

現在，部材性能に関する研究は，基本的には部材構成板厚によりそれぞれ行われているのが現状であり，国内，国外においても板厚，製法による区分が基本的には行れ，それぞれを専門とする研究者が研究を遂行し，その成果を各規準等に反映させているのが現状である．本来，ある板厚で部材性能が変化するわけではなく，連続であると考えるべきであるが，このような区分が合理的な設計手法の妨げとなっている．各区分を横断的統一的に扱う本研究課題を確実に遂行し，その成果を設計手法に反映させることで大きな社会貢献に繋がるとともに，安定性という概念を導入し，統一的に捉え直すことは極めて独自性，新規性を有している．