Development of Hybrid Braces Composed of Steel Tube, Cement Grout and Lumber for Seismic Retrofitting

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K23552
• 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: Nagasaki University
• Principal Investigator: CHAN Iathong 長崎大学, 工学研究科, 助教 (00846123)
• Project Period (FY): 2019-08-30 – 2021-03-31
• Keywords: 耐震補強 / CFTブレース / 長柱中心圧縮実験 / 累加座屈耐力

Outline of Final Research Achievements

The purpose of this study is to develop a new seismic retrofitting members for the earthquake-prone areas where heavy machinery cannot be used, such as remote islands, mountainous areas, and developing countries. The seismic retrofitting member of this research is a hybrid member that consists of wood, grout (non-shrink mortar), and steel tube. We conducted loading tests and numerical calculations for dozens of those hybrid members, and confirmed that they have sufficient performance as seismic retrofitting members.
In addition, based on the above results, a plan for seismic retrofitting using this new hybrid member is currently underway in Romania.

Free Research Field

建築構造

Academic Significance and Societal Importance of the Research Achievements

近年の地震予測より，いままでに経験したことのない地震が起きる可能性があると指摘されている．そのため，世界各地の地震多発地域で，既存の建物の耐震補強が急務となっている．しかしながら，離島・山間部・発展途上国など重機が利用できない地域では，耐震補強が進められていない．その要因の1つは，従来の耐震補強工法には重機と大量の特殊な素材が必要なことにある．
以上の状況に対して，本研究では離島・山間部・発展途上国でも簡単に入手できる材料を利用し，人力のみで施工可能の耐震補強工法を開発・研究している．その結果，新しいハイブリッド部材の開発に成功し，世界中の耐震補強に役立てられる．