1994 Fiscal Year Final Research Report Summary
CRACK PREDICTION OF HIGH DURABLE CONCRETE STRUCTURES BASED ON FRACTURE MECHANICS
| Project/Area Number |
05650438
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
土木材料・力学一般
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| Research Institution | KUMAMOTO UNIVERSITY |
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Principal Investigator |
OHTSU Masayasu KUMAMOTO UNIVERSITY,DEPT.CIVIL & ENVIRONMENTAL ENG.PROFESSOR, 工学部, 教授 (80109016)
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| Co-Investigator(Kenkyū-buntansha) |
MURAKAMI Kiyoshi KUMAMOTO UNIVERSITY,DEPT.ARCHITECTURE ASSOCIATE PROFESSOR, 工学部, 助教授 (80182088)
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| Project Period (FY) |
1993 – 1994
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| Keywords | FRACTURE MECHANICS / HIGH DURABLE CONCRETE / CRACK / ACOUSTIC EMISSION / BOUNDARY ELEMENT METHOD |
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| Research Abstract |
An application of acoustic emission (AE) techniques to fracture mechanics is investigated and experimental devices for the research purpose are equipped. Fracture mechanics (FM) parameters are studied in experiments of plain and fiber-reinforced concrete, and it is clarified that the size effect of FM parameters should be taken into account for the analysis of crack propagation in concrete. Quantitative AE waveform analysis is developed as SiGMA procedure and is applied to uniaxial compression tests of plate specimens. Results confirm the usefulness of the SiGMA procedure to identify crack locations, crack types, and crack orientations. The boundary element method (BEM) is applied to analyze crack propagation in concrete in arbitrary directions. The analytical procedure is so effective that crack traces obtained in experiments are readily predicted by the BEM analysis.
In order to confirm crack kinematics determined by the SiGMA procedure, a post-analysis is developed. Crack nucleation in high durable concrete such as carbon-fiber and steel-fiber reinforced concrete is studied on the basis of fracture mechanics. The ability of the crack prediction by BEM is confirmed in the scaled-down model study.
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