Development of Design Methodology of Steel Beam-to-column Connections Subjected to Bending and Axial Force

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K04689
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 23010:Building structures and materials-related
• Research Institution: Shibaura Institute of Technology (2021-2022); Kobe University (2019-2020)
• Principal Investigator: Asada Hayato 芝浦工業大学, 建築学部, 准教授 (70620798)
• Co-Investigator(Kenkyū-buntansha): 吉敷 祥一 東京工業大学, 科学技術創成研究院, 教授 (00447525) ; 田中 剛 神戸大学, 工学研究科, 教授 (90243328)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 鋼構造 / 梁端接合部 / 耐力 / 塑性変形能力 / 耐震性能 / 軸力 / 曲げモーメント

Outline of Final Research Achievements

In buildings where the vibration-controlled frame or rigid-floor-assumption does not hold, not only bending moments but also axial forces act on the beams simultaneously. This study experimentally and analytically investigated the effects of beam axial forces on the load-carrying capacity and plastic deformation capacity of steel beam-to-column connections with typical connection details employed in Japan. The results show that if the magnitude of the axial force acting on the beam-to-column connection is less than the plastic axial strength of the welded web connection, the axial force does not significantly increase the strain concentration at the point of failure, nor does it significantly reduce the plastic deformation capacity, thus providing a framework for a design method that takes the effect of axial force into account.

Free Research Field

建築構造・材料

Academic Significance and Societal Importance of the Research Achievements

本研究では，これまで明らかとなっていなかった鋼構造梁端接合部が，曲げだけでなく，軸力を同時に受ける場合の力学挙動を検討し，軸力が耐力および塑性変形能力に与える影響を定量的に評価できた点において学術的な意義のあるものと考える。また，通常の重層建築物とは異なる応力条件下の梁端接合部の力学性能を明らかにしたことは，建築計画上の多様な要求に応えた構造計画の立案ならびに構造設計上の自由度と信頼性を高めることに貢献しており，社会的意義があるものと考える。