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2021 Fiscal Year Final Research Report

Response magnification phenomenon caused by damper damage during disturbance and a simplified evaluation of the ultimate response amplification factor

Research Project

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Project/Area Number 19H02292
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 23010:Building structures and materials-related
Research InstitutionOsaka Electro-Communication University

Principal Investigator

Tsuji Masaaki  大阪電気通信大学, 工学部, 教授 (00243121)

Co-Investigator(Kenkyū-buntansha) 北尾 聡子  大阪電気通信大学, 工学部, 准教授 (40273552)
Project Period (FY) 2019-04-01 – 2022-03-31
Keywordsオイルダンパー / ダンパー取付部材 / 地震時応答逆転現象 / ダンパーの損傷 / 振動台実験
Outline of Final Research Achievements

(1)A closed-form solution for the maximum displacement response of an elastic building model with oil dampers subjected to pulsating seismic motion is obtained, and it is shown theoretically that if the damper drops out during seismic motion, the maximum seismic displacement may be amplified more than that of a building without dampers.
(2)Shaking table experiments demonstrated that the displacement and acceleration are amplified when the damper drops out or reaches its maximum stroke during seismic motion, and that the stiffness of damper attachment member has a significant effect on the amplification rate.

Free Research Field

建築構造力学

Academic Significance and Societal Importance of the Research Achievements

これまでは,地震動作用中にダンパーやその取付部材が損傷したり,ダンパーがストロークの最大値に到達したりすることは想定されていなかったが,2011年の東北地方太平洋沖地震や2016年の熊本地震において,実際にそのような損傷が観察されている.このような損傷が生じた場合に,建物の応答が顕著に増幅し,ダンパーがない場合よりも大きくなる可能性があることを本研究は初めて明らかにしたもので,ダンパーの限界性能の設定や,極大地震に対する建物の安全性評価に,今後はいっそう慎重を期す必要があることを示している.

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Published: 2023-01-30  

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