2023 Fiscal Year Final Research Report
Evaluation of deteriorated structural performance of RC members by existing crack profiles
| Project/Area Number |
21H01472
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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 23010:Building structures and materials-related
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| Research Institution | University of Tsukuba |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
カストロ ホワンホセ 琉球大学, 工学部, 教授 (70593391)
八十島 章 筑波大学, システム情報系, 准教授 (80437574)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 鉄筋コンクリート / ひび割れ / 構造性能 / 性能劣化 / 構成則 / 腐食 |
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| Outline of Final Research Achievements |
The experiments for cracked concrete induced by rebar corrosion and reinforced concrete (RC) members with existing cracks, as well as compression tests, pullout bond tests, uniaxial tensile bond tests, beam-type bond tests, and anti-symmetrical bending shear tests were conducted to develop various constitutive laws for evaluating deterioration of structural performance and to grasp those of RC members. Existing cracks were simulated by filling pipes or holes buried in the concrete with expansion agent, and cracks caused by internal expansion pressure were simulated by burying plastic plates. The methods for evaluating the changes in various constitutive laws based on the direction, length, and width of existing cracks, and the deterioration in structural performance of RC members influenced by these factors are evaluated and verified.
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| Free Research Field |
建築構造材料
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| Academic Significance and Societal Importance of the Research Achievements |
1981年の新耐震基準前に建設された既存不適格建物に対して耐震診断が多数行われてきており、劣化の指標として、ひび割れやコンクリートの中性化等をポイント的に積み上げていった経年指標が用いられるが、その力学的意味合いはないに等しい。RC部材の剛性や耐力、応答履歴等の力学性能は、本来、コンクリートと鉄筋の構成則およびそれらの相互作用で決定されるものであり、経年劣化などで生じる性能の変化も、それらの変化で説明され得るものと考えられる。本研究の成果により、既存ひび割れのプロファイル化によってRC部材の構造性能の劣化の程度を力学的意味合いを保持しつつ定量的に評価することができるようになる。
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