2023 Fiscal Year Final Research Report
Investigation on the relationship between visual inspection results and remaining performance of existing civil FRP structures
| Project/Area Number |
21H01419
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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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 | Kyoto University |
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Principal Investigator |
Kitane Yasuo 京都大学, 工学研究科, 教授 (10444415)
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| Co-Investigator(Kenkyū-buntansha) |
橋本 国太郎 神戸大学, 工学研究科, 准教授 (40467452)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | FRP / 劣化 / 残存性能 / 外観評価 / 非破壊試験 / 補修 / 維持管理 |
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| Outline of Final Research Achievements |
In this study, in order to collect data that will contribute to the maintenance of civil FRP structures, material tests and component tests were conducted on FRP components exposed for approximately 20 years to understand the remaining performance after exposure and to compare it with the visual evaluation. It was found that in the case of moisture-induced deterioration, it is difficult to determine the remaining mechanical performance by visual evaluation. Surface repairs and strength restoration repairs were also conducted to confirm the effectiveness of the performance restoration. Outdoor exposure tests for 20 years are still ongoing for the surface-repaired specimens. Furthermore, evaluation of the residual performance of FRP by several different nondestructive tests was attempted, and it was found that at present it may be difficult to evaluate the strength degradation due to material deterioration, although the elastic modulus degradation may be evaluated for a certain cases.
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| Free Research Field |
構造工学
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| Academic Significance and Societal Importance of the Research Achievements |
FRPが土木構造物に適用され始めてから数十年が経過しているが，土木FRP構造物の維持管理方法は未だ確立されていない．本研究の成果は，土木FRP構造物の点検における外観評価の判断材料になるとともに，劣化が大きい場合の補修事例も示しており，FRP構造物の維持管理に有用な知見を提示している．また，外観では判別することが難しい水分による劣化が大きいことも実験的に明らかにしており，今後水分による長期的な劣化プロセスおよびその程度を明らかにする必要性が示されたことは学術的にも意義が大きい．
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