2018 Fiscal Year Final Research Report
Proposal to seismic control design for steel potal frame with BRBs
| Project/Area Number |
16K06477
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Structural engineering/Earthquake engineering/Maintenance management engineering
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| Research Institution | Meijo University |
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Principal Investigator |
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| Research Collaborator |
Yoshino Hiroichi
Ishida Masashi
Asai Shunya
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| Project Period (FY) |
2016-04-01 – 2019-03-31
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| Keywords | ダンパー / 鋼製ラーメン橋脚 / ガセットプレート / 局部座屈 / ハイブリッド実験 / レベル２地震 / 低サイクル疲労 / エネルギー吸収 |
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| Outline of Final Research Achievements |
Buckling-restrained braces (BRBs) are used as energy dissipation dampers to improve the seismic performance of steel rigid-frame piers.
In the present study, the effectiveness of BRBs connecting steel rigid-frame piers with gusset plates to protect the structure under cyclic loading was experimentally investigated. Compared with the load carrying capacity of the original structure, the strengthened model with BRBs was found to be equivalent in terms of deformation capacity and ultimate strength. An online seismic response test was carried out on a specimen with a bolted gusset in order to examine the seismic behavior under severe earthquake conditions. The results indicated that a bridge pier subjected to seismic control using a BRB could maintain member safety level 2.
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| Free Research Field |
構造工学
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| Academic Significance and Societal Importance of the Research Achievements |
1995に発生した阪神淡路大震災で被災した鋼製ラーメン橋脚の損傷を教訓として，橋脚の耐震性能の向上のために橋脚内部のリブ補強やコンクリート充填工法などの多くの研究がなされた．その結果，耐震性能を向上させた橋脚の設計法が確立されているが，座屈拘束ブレースなどの制震ブレースを添加する制震化手法は概念的な範囲に留まり，具体的な設計に踏み込んだ研究は非常に少ない．
本研究は，強震時の鋼製ラーメン橋脚の損傷を非線形特性に配慮して部分的な範囲にとどめ，橋脚としての機能を保持するための設計手法を提案しており，耐震設計の選択肢を広げる意味で重要な意味をもつ．
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