| Project/Area Number |
18K04333
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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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| Review Section |
Basic Section 22020:Structure engineering and earthquake engineering-related
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| Research Institution | Meijo University |
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Principal Investigator |
Ge Hanbin 名城大学, 理工学部, 教授 (90262873)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 延性破壊 / 低サイクル疲労 / 応力三軸度 / 簡易照査法 / 鋼製橋脚 / 高応力三軸度 / 低応力三軸度 / 損傷進展エネルギー / 溶接鋼部材 / き裂進展 / 破断 |
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| Outline of Final Research Achievements |
In this study, we focused on ductile cracks occurred in civil engineering steel structures under a major earthquake in, and examined the evaluation method of their occurrence and progress. First, by experimental and analytical studies, a ductile fracture model is constructed, and a series of phenomena from crack initiation, growth, and fracture of structural steels under various stress states are clarified. In addition, cyclic loading analyses of both a fiber model consisting of beam elements and a shell model consisting of shell elements were carried out for box-shaped steel piers, and the strain concentration modification coefficient for stiffened box-shaped steel piers was newly proposed. The application range of the seismic performance verification method for the occurrence of ductile cracks was expanded using the fiber model and the cumulative fatigue damage degree.
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| Academic Significance and Societal Importance of the Research Achievements |
低サイクル疲労による延性破壊現象は，兵庫県南部地震などの巨大地震で被災した鋼構造物の被害形態として少なからず報告されている．本研究では，各種構造用鋼材を対象とした溶接鋼部材の延性き裂発生から破断までの挙動を精度よく評価できる延性破壊モデルの構築に成功している．また，本研究によって得られた成果は，現行の耐震設計法の高度化に貢献できるとともに，社会インフラ施設の耐震安全性を一層向上させることが期待される．
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