2021 Fiscal Year Final Research Report
Highly-Resilience Connection for Steel Roof Bearings Preparing for Beyond Scenario Earthquake
Project/Area Number |
19K04567
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Review Section |
Basic Section 22020:Structure engineering and earthquake engineering-related
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Research Institution | Osaka City University (2021) Tohoku University (2019-2020) |
Principal Investigator |
Furukawa Sachi 大阪市立大学, 大学院工学研究科, 講師 (30636428)
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Project Period (FY) |
2019-04-01 – 2022-03-31
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Keywords | アンカーボルト / 露出柱脚 / 接合部回転性能 / 鉄骨置屋根 |
Outline of Final Research Achievements |
Cyclic loading tests of the proposed connection (new variation of exposed-type column base) shows that the connection has a sufficiently low rotational stiffness, and evaluation formula to predict rotational stiffness and yielding moment of the connection is proposed. It also reveals that with spring washer between a nut of an anchor bolt and a base plate, the connection becomes an ideal pin connection without any tension acts on an anchor bolt. The shear behavior of the proposed connection applied to the top of the RC column was tested, comparing with those of the conventional exposed-type column base. Series of tests shows that the shear strength of crack initiation can be predicted by concrete pullout strength. The conventional connection lost stiffness after crack initiation while the proposed connection sustains large stiffness and shear strength which is predicted by sectional shear strength of RC element.
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Free Research Field |
耐震工学
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Academic Significance and Societal Importance of the Research Achievements |
市民体育館等で一般的に採用される鉄骨置屋根形式の体育館が被災し,避難所としての機能を果たせず,災害直後の現地の混乱をさらに助長する例が後を絶たない。一方で,大空間構造である体育館は,屋根と屋根を支持する外周構造体の双方で面外剛性が低いことから,地震時における屋根支承接合部への設計要求値を正確に把握し難いという特徴がある。 以上を踏まえて,本研究では脆性的な破壊を生じやすい従来型の屋根支承接合部に対して,より機構が簡明で高い靭性を保有する接合部を提案した。実験を通して提案する接合部の応力伝達機構の解明と回転特性,およびせん断耐力の評価方法を提示した。
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