| Project/Area Number |
13355019
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
土木材料・力学一般
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| Research Institution | The University of Tokyo |
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Principal Investigator |
MAEKAWA Koichi Graduate School of Engineering, Professor, 大学院・工学系研究科, 教授 (80157122)
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| Co-Investigator(Kenkyū-buntansha) |
ISHIDA Tetsuya Graduate School of Engineering, Lecturer, 大学院・工学系研究科, 講師 (60312972)
KISHI Toshiharu Institute of Industrial Science, Associate Professor, 生産技術研究所, 助教授 (90251339)
安 雪暉 東京大学, 大学院・工学系研究科, 助教授 (50312971)
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| Project Period (FY) |
2001 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥45,370,000 (Direct Cost: ¥34,900,000、Indirect Cost: ¥10,470,000)
Fiscal Year 2002: ¥20,800,000 (Direct Cost: ¥16,000,000、Indirect Cost: ¥4,800,000)
Fiscal Year 2001: ¥24,570,000 (Direct Cost: ¥18,900,000、Indirect Cost: ¥5,670,000)
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| Keywords | artificial pre-crack / shear capacity / seismic stability / numerical analysis / reinforced concrete / non-orthogonal crack / active-crack method / tension-stiffness / 人口亀裂 / 高強度コンクリート / せん断破壊 / 有限要素解析 / アクティブクラック法 / 接触面密度関数 / せん断伝達 |
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| Research Abstract |
1) In order to clarify the interrelation between artificial pre-crack induced in concrete member and shear crack caused by shear force, a series of experiments was performed. Under both monotonic and cyclic loading, the artificial pre-creak prevented propagation of new share crack and then the capacity and ductility of RC member increased. On the contrary, when the angle between pre-crack and new crack because less than 30 degree, the capacity of member was decreased owing to the new crack formed along the pre-crack.
2) Non-orthogonal smeared crack model of enhancing active crack method was adopted as a constitutive law to deal with non-orthogonal cracks with intersection. Comparinson with the experimental results verified that the proposed model could well predict the behavior of cracks with mutual interaction.
3) Shear behavior of concrete members with embedded plastic plates, as devices to emulate pre-cracks, was studied based on both experimental facts and analytical approach. As a result, proposed joint element had a beneficial effect on modeling consecutive plates.
4) The accuracy of the proposed non-orthogonal crack model was verified with experiments of RC plate structures under multi-directional loading. The result showed that active-crack method, which defined Intersection angle of 22.5 degrees as a threshold, could well predict interrelation between non-orthogonal cracks. In addition, the application of the model for structures that consist of high strength concrete and high strength reinforcing bars was proven.
5) Because thermal stress was assumed as an introduction source of pre-cracks, the tension-stiffness behavior of embedded steel in concrete under high temperature was clarified experimentally. The manifested characteristics were incorporated into the structural numerical analysis system.
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