Seismic Repair of Steel Brafing Frames in Longitudinal Direction

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K20459
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0304:Architecture, building engineering, and related fields
• Research Institution: Toyohashi University of Technology
• Principal Investigator: Nakada Shotaro 豊橋技術科学大学, 工学(系)研究科(研究院), 助教 (30964019)
• Project Period (FY): 2022-08-31 – 2024-03-31
• Keywords: 被災後補修 / 露出柱脚 / アンカーボルト / 残留変形 / 締め直し / コーン状破壊 / あと施工アンカー / 増打ち

Outline of Final Research Achievements

The applicant studied the seismic repair by retightening anchor bolts with residual deformation using a numerical analysis. The findings obtained from the analysis indicated that seismic repair by retightening anchor bolts must be completely retightened. Furthermore, it was shown that an unbalanced repair pattern could amplify the deformation at the corner of the gymnasium, which in turn could induce damage.
In addition, structural experiments were conducted to investigate seismic repair by reinforcing exposed column bases that had failed due to cone failure. It was found that the maximum strength and residual strength of the reinforcement can be evaluated by different mechanical models depending on the failure type.

Free Research Field

建築構造

Academic Significance and Societal Importance of the Research Achievements

申請者は、数値解析および構造実験を実施し、アンカーボルトが残留変形した損傷およびコーン状破壊した露出柱脚の被災後補修について提案した。露出柱脚の補修法を損傷別に提案した研究は、ほとんどなく学術的意義があると言える。さらに、本研究成果は、今後の被災後補修に関する研究の発展・活性化に大きく貢献し、ひいては我が国の防災強化に資する重要な研究成果として高く評価でき、社会的にも意義があるものである。