復旧時セルフセンタリング機構を有するメタボリズム柱構造の解析的検討

Abstract

本研究では，セルフセンタリング機構による優れた復旧性と地震時のエネルギー吸収性能の両立を目的に，復旧時にのみセルフセンタリング機構が顕在化する柱構造の開発を目指す．具体的に，筆者らが過去に提案しているメタボリズはム柱構造（常時軸力を支持する永続部と，地震時にエネルギー吸収性能を発揮する可換部で構成された柱構造）に対し，セルフセンタリング機構を発現するコンクリートヒンジを永続部に用いた構造を提案し，解析的検討を実施した．その結果，提案構造において，取替可能な可換部の塑性化による地震時のエネルギー吸収性能を確認した．さらに，地震応答解析を実施し，提案構造に地震後の残留変位を生じさせ，可換部撤去時の応答把握を目的とした動的解析を実施したところ，永続部によるセルフセンタリング機構の顕在化を確認した．

In this study, we aim to develop a column that exhibits a self-centering only during restoration process in order to achieve both self-centering mechanism and hysteretic damping. We used the metabolism column structure proposed in the past as a reference. The metabolism column structure consists of a permanent part that always supports the axial force and a changeable part that absorbs energy during an earthquake. Specifically, we proposed a new structure using concrete hinges as the permanent part, which has a self-centering mechanism, and verified its feasibility through numerical analysis. As a result of the numerical analysis, the energy absorption performance of the proposed structure during the earthquake was confirmed by the plasticization of the commutative part. In addition, earthquake response analysis was conducted to generateresidual displacement of the proposed structure after the earthquake, and dynamic analysis was conducted to understand the response at the time of the removal of the replaceable part. As a result, the selfcentering mechanism of the permanent part was confirmed.