Column base system of Steel structural aimed at extending the life of buildings by reducing earthquake response and repairing damage

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K04707
• 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: University of Fukui
• Principal Investigator: Inoue Keiichi 福井大学, 学術研究院工学系部門, 准教授 (70333630)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 地震応答 / 柱脚浮き上がり / 制振構造 / 画像解析

Outline of Final Research Achievements

Structural system that reduces damage to the building and extends its service life by allowing the column base to uplift during an earthquake was proposed. Vibration experiments using small scale models were conducted to discuss the seismic response characteristics. Some load tests were conducted on specimens using a new column base system that absorbs energy by yielding the anchor bolts of the column base and replaces damaged anchor bolts after a large earthquake. Effectiveness of the proposed column base system was demonstrated. In addition, through the seismic response analyses of the structural model and the vibration experiments of the small vibration specimens, it was considered the seismic response property and presented the knowledge toward the realization of the structural system with column base uplifting.

Free Research Field

建築構造・材料

Academic Significance and Societal Importance of the Research Achievements

大地震が発生した場合に、建物の損傷を低減し、エネルギーを吸収する柱脚部の修復を容易とする構造システムを提案した。大地震時に柱脚部が浮き上がり、振動特性の変化による地震応答低減効果があり、かつ柱脚部でエネルギーを吸収することで建物の損傷を減らし、かつ柱脚部の修復性を有する制振システムの開発のための基礎データを提示した。
特に、エネルギー吸収した結果損傷が生じる可能性がある要素が、柱脚部のアンカーボルトのみになり、大地震後に交換できるようにしておくことにより、地震後の建物構造体の長寿命化を見込むことができる。
既存の耐震・制振装置が設置しにくい建物にとっては、有効な地震応答制御法の１つになる。