2023 Fiscal Year Final Research Report
Development of variability prediction method for initial imperfections of corrosion-damaged steel bridge members
| Project/Area Number |
21K04243
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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 | Daido University (2023)
Nagaoka National College of Technology (2021-2022) |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 初期たわみ / 残留応力 / 腐食 / 溶接組立 / 鋼部材 / 複合サイクル試験 |
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| Outline of Final Research Achievements |
The outcome of this study is that, from the quantitative analysis of the change in initial imperfection due to corrosion damage of a single butt-welded steel plate at the time the research theme was conceived, the change in initial deflection and residual stress due to actual corrosion of the welded and assembled I- and box-shaped section members in this study was clarified by experiment. It was found that the change in initial deflection before and after corrosion was greater in the flanges of I-section members, where the plates constituting the cross section are less constrained, than in the I-section bellies and box section members.
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| Free Research Field |
工学
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| Academic Significance and Societal Importance of the Research Achievements |
土木鋼構造物の腐食損傷に伴う変形は，実構造部材の性能に十分な影響を及ぼすレベルであることも考えられ，変形とともに接合部位での残留応力の変化が想定できる．腐食損傷による残留応力および初期たわみの変化は，鋼橋の強度特性に影響を及ぼすため，これらを定量的に予測する手法の提案が維持管理における性能照査に必要不可欠である．
本研究では，厚板で構成される鋼構造部材の腐食過程における溶接残留応力および初期たわみの変動を実験により詳細に明らかにした．これらの結果は，前述の腐食損傷した鋼構造部材の残存強度特性を調べる際に活用でき，腐食損傷レベルに応じた耐荷力評価および補修方法の提案に直結できる．
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