2022 Fiscal Year Final Research Report
Development of constitutive model for creep and shrinkage behavior of concrete in steel-concrete hybrid structure
| Project/Area Number |
20K04662
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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 | Nagaoka University of Technology |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
宮下 剛 長岡技術科学大学, 工学研究科, 准教授 (20432099)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 鋼コンクリート複合構造 / 頭付きスタッド / クリープ |
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| Outline of Final Research Achievements |
Experiments were carried out on the time-dependent deformation and stress transfer characteristics of joints of steel-concrete composite structures connected by headed studs embedded in concrete under sustained shear loading.
The shear force at which the stud yields is lower than that under static shear force. The time-dependent increment in shear displacement due to sustained loading is caused by the creep deformation of the concrete and the time-dependent increase in the curvature of the stud. At levels below 35% of the static yield strength, the creep shear displacement is proportional to sustained shear stress. Creep shear displacement under varying shear force cannot be estimated by the superposition rule. Sustained shear force affects residual shear displacement after unloading and shear stiffness at unloading.
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| Free Research Field |
コンクリート構造、鋼コンクリート複合構造
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| Academic Significance and Societal Importance of the Research Achievements |
コンクリートと鋼がスタッドで接合された鋼コンクリート複合構造の力学特性のうち、未解明である時間依存性挙動について、実験的に検討した。応力レベルが低い範囲での持続載荷時の挙動は線形クリープ則に従うことが明らかとなった。このことは、従来の鉄筋コンクリート、プレストレストコンクリートと共通する性質であり、鋼コンクリート複合構造の設計にとって有効な情報となる。
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