| Project/Area Number |
18560461
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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 |
Structural engineering/Earthquake engineering/Maintenance management engineering
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| Research Institution | Hokkaido University |
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Principal Investigator |
KANIE Shunji Hokkaido University, Faculty of Public Policy, Professor (10332470)
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| Co-Investigator(Kenkyū-buntansha) |
AKAGAWA Satoshi Hokkaido University, Grad. School of Eng., Professor (90360932)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2007: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2006: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | Frozen soil / Frost Bulb / Pipeline / Freezing Experiment / Stress Evaluation / Analysis |
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| Research Abstract |
Adfreeze Bond Strength Experiment
Adfreeze Bond Strength Experiment was carried out by an axis-symmetric freezing apparatus with constraining the perimeter of the cylinder shaped specimen in order to give the constraining normal stress at the boundary between the pipe and frost bulb. By changing the temperature of the antifreeze flowing in the pipe, it can be possible to control the growth of the frost bulb and it can be expected that the internal stress distribution within the specimen as well as the normal stress at the boundary vary correspondently. Through 7 cases of the experiment with different constraining conditions, the change in adfreeze bond strength was observed.
As a result, the normal stress at the boundary is confirmed as one of the most important factors for adfreeze bond strength and the relationship between shear stress and relative displacement shows nonlinear property due to the effect of the normal stress and the intensity of the stress enhance the durability in bonding.
Modeling for Interactive Action between the Pipe and the Frost bulb
The analytical stress evaluation model was improved to consider the stress distribution within the specimen corresponding to the change in the constraining stress acting on the perimeter. Based on this model, it became possible to estimate the normal stress at the boundary and the effect of it on the adfreeze bond strength was successfully evaluated by the means of numerical approach. This model is thought to be expanded to multi-dimensional evaluation model as a practical model for design. It is convinced that fundamental findings for the establishment of designing method for chilled gas pipeline under frost heave action are obtained.
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