2021 Fiscal Year Final Research Report
An Indicator of Ultimate Strength Verification for Existing Concrete Structures Subjected to Frost Damage
| Project/Area Number |
19K15062
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 22010:Civil engineering material, execution and construction management-related
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| Research Institution | Hokkai-Gakuen University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 鉄筋コンクリート部材 / 凍害 / せん断耐力 / 曲げ耐力 / 極限解析 |
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| Outline of Final Research Achievements |
A mechanical model was developed to analytically calculate the flexural and shear strength of reinforced concrete (RC) members subjected to freeze-damage based on the damage depth obtained from concrete cores sampled from actual structures. Here the analytical model means the hand calculation without using regression approach based on experimental results. The model validation was performed by an actual RC members, which faced the severe frost damage in Hokkaido.
This study enables a simple and quantitative assessment regarding the remedial measures for such structures, by determining distribution of the relative dynamic modulus of elasticity of the sampled cores.
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| Free Research Field |
コンクリート工学，構造力学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では，凍害を受けた既設鉄筋コンクリート構造物に対して力学的合理性のある維持管理を行うための指標として，凍害による表面からの劣化深度を考慮可能な力学モデルを構築したものである．本研究の成果により，実構造物のコンクリートコアから得た情報を直接部材耐力に活かすことが可能となった．これにより，凍害に対して，無筋コンクリートの材料劣化に対する耐久性評価のみが行われてきた状況が改善しうると考えている．
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