| Project/Area Number |
12650572
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Building structures/materials
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| Research Institution | Kyoto Institute of Technology |
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Principal Investigator |
KOSAKA Ikuo Kyoto Institute of Technology, FACILITY OF ENGINEERING AND DESIGN, Associate Professor, 工芸学部, 助教授 (40127163)
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| Co-Investigator(Kenkyū-buntansha) |
UETANI Koji Kyoto University, GRADUATE SCHOOL OF ENGINEERING, Professor, 大学院・工学研究科, 教授 (40026349)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2002: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2001: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2000: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | FRACTURE MECHANICS / STABILITY / BRITTLE / CRACK GROWTH / STEEL STRUCTURE / 亀裂 |
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| Research Abstract |
We have researched on fracture behaviors of building structures with initial cracks in the elements. Based on the fracture mechanics, Boundary Element Method is applied to numerical analysis of crack growth behavior. Applying the BEM crack growth analysis, we determined the end moment-end rotation relations for, the, rectangular brittle beam and wide flange brittle beam, which represent unstable equilibrium paths for the crack growth. On the basis of them, we propose the rotation spring models as simple and effective substitute for the crack elements. These rotation spring models are effective for numerical analysis of brittle fracture behaviors of building structures with crack elements. On the brittle structures with initial cracks in the elements, the stability on crack propagation will be influenced by the stiffness of the structure without the crack part. If the stiffness of the structure without the crack part is large, crack propagation will grow rapidly. We presented that eigen-value and eigen-vectors of the stiffness matrix of the structure are useful for determination of the stability on crack propagation, and that its condensed stiffness matrix can be used instead of the stiffness matrix. This method can be applied to the structures with plural number of initial cracks. Many, crack growth tests are examined and some characteristics of the growth are presented. Deeply-notched specimen tests consist of the extension of steel plate, bend of wide-flange steel beams, bend of steel beam and steel column joints, and bend of T-shaped styrene form beams.
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