2004 Fiscal Year Final Research Report Summary
Basic research on the shear band formation by pulling out of anchor
| Project/Area Number |
15560421
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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 |
Geotechnical engineering
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| Research Institution | Tohoku University |
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Principal Investigator |
IKEDA Kiyohiro TOHOKU UNIVERSITY, GRADUATE SCHOOL OF ENGINEERING, PROFESSOR, 大学院・工学研究科, 教授 (50168126)
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| Co-Investigator(Kenkyū-buntansha) |
TSUTSUMI Seiichiro KYUSHU UNIVERSITY, GRADUATE SCHOOL OF ENGINEERING, RESEARCH ASSOCIATE, 大学院・工学研究院, 助手 (70344702)
YAMAKAWA Yuuki NAGAOKA UNIVERSITY OF TECHNOLOGY, SCHOOL OF ENGINEERING, RESEARCH ASSOCIATE, 工学部, 助手 (80324010)
OZAKI Toshiyuki KYUSHU ELECTRICAL TECHNOLOGY, RESEARCHER, 技術開発室, 主任研究員
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| Project Period (FY) |
2003 – 2004
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| Keywords | Tower for electrical line / Pulling out test / Sloped ground / Elasto-plastic deformation analysis / Shear band formation |
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| Research Abstract |
This research has been conducted for the following three purposes :
1.The search for the mechanism of shear band formation by the pulling out of the anchor.
2.The development of three-dimensional large deformation elasto-plastic FEM analysis program.
3.The search for the interaction of the shape of foundation and the failure mechanism.
The pulling out analysis of the anchor by the wind load has been conducted for the ground slopes of 0, 25, and 35 degrees to obtain the curves of load and deflection and the form of shear bands on the surface. The tilted ground exhibited higher pulling out resistance by virtue of the use of the post connection.
A three-dimensional large deformation elasto-plastic FEM analysis program has been developed with the use of associated and non-associated flow rules. The latter rule displayed much better correlation with the experimental results.
Three-dimensional analyses are conducted on the flat and tilted grounds, and compared with the associated experiments. As a result of this, the computed located zones turned out to be consistent with the experimental observation, and the variation of the pulling out strength of the anchor in association with the change of the angle of the slope. In addition, the rotation of the anchor has been observed.
Last the simulation of on-site pulling out test was conducted to simulate force vs displacement curves and slide lines on the ground surface.
It will be a topic in the future to arrive at more realistic pulling out behaviors through the followings : 1.The improvement of the. analysis program by the implementation of the progressive failure. 2.The evaluation of the heterogeneity of soils.
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