| Project/Area Number |
04555106
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
土木構造
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| Research Institution | UNIVERSITY OF TOKYO |
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Principal Investigator |
HORII Hideyuki Dept.of Civil Eng., UNIVERSITY OF TOKYO,Assoc.Professor, 工学部, 助教授 (10181520)
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| Co-Investigator(Kenkyū-buntansha) |
SONG Ha-Won Dept.of Civil Eng., UNIVERSITY OF TOKYO,Assist.Professor, 工学部, 講師 (10226722)
YAMAGUCHI Eiki Dept.of Civil Eng., UNIVERSITY OF TOKYO,Assoc.Professor, 工学部, 助教授 (90200609)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥5,500,000 (Direct Cost: ¥5,500,000)
Fiscal Year 1993: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1992: ¥3,800,000 (Direct Cost: ¥3,800,000)
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| Keywords | Fracture mechanics / Crack growth analysis / Tension-softening curve / Rock / Concrete / Tunnel lining / Design method / 逆解析 / 鋼繊維補強コンクリート / トンネル覆工 / 境界要素法 / 有限要素法 / コンクリ-ト / レ-ザ-スペックル法 / 引張試験 / 曲げ試験 |
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| Research Abstract |
A general analysis method for crack growth in concrete and rock is developed. A finite element with displacement discontinuities is formulated. Along the discontinuities a tension-softening relationship is satisfied and bifurcation into the unloading path from the tension-softening path is judged. As a result, the localization of cracking, for example in a beam without an initial notch under bending, can be captured by the proposed method.
A back analysis method is developed to determine the tension-softening curve from a load-displacement curve obtained in, for example, a bending test of a notched beam. The tension-softening curve represents material properties on tensile fracture. Direct tension test is difficult to conduct, and the proposed method provides a solution to the problems in the practical application of fracture mechanics.
Based on the developed analysis method and back analysis method for tension-softeing curve, a design method of tunnel lining with SFRC (steel fiber reinforced concrete) is proposed. The cross-sectional capacity is estimated based on fracture mechanics of concrete.
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