| Project/Area Number |
15560505
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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 | Kanagawa University |
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Principal Investigator |
OHKUMA Takeshi Kanagawa Univ., Faculty of Engineering, Professor, 教授 (50078317)
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| Co-Investigator(Kenkyū-buntansha) |
OKADA Hisashi Building Research Institute, Structural Engineering Department, Director, 建築研究所, 構造研究グループ長 (00344002)
KATAGIRI Junji Izumisohken Engineering, Urban Environment Research Center, Chief Research Engineer, 都市環境技術研究所, 主席研究員
SHIMOMURA Shoichi Kanagawa Univ., Faculty of Engineering, Research Associate, 工学部, 助手 (10343633)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2004: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2003: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | Roof Tile / Wind Pressure Coefficient / Wind Force Coefficient / Full-scale Measurement / Wind Tunnel Test / Static Loading Test |
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| Research Abstract |
The characteristics of wind forces on roof tiles without lifting were clarified in the previous report (Project number 13640643). But tiles are lifted just before they are dislodged in strong wind. Therefore the characteristics of wind force on tiles with lifting must be clarified because they are probably different from these on tiles without lifting. Considering the behavior of tiles in strong wind, the relationship between the tile lifting value and the wind force should be also clarified.
This study carried out examinations described as follows. First, the wind pressure and force acting on artificially lifted tiles were measured by the full-scale measurement in a natural wind. The result derived followings : 1)Mean wind force on tiles in general parts of roof increases to negative as tile lifting increases. In the other area, the change of mean wind force with tile lifting is negligible. 2)The increase in maximum negative peak force with tile lifting is caused by a change in internal pressure in general parts of the roof. For tiles in the verge, the increase in negative peak force with tile lifting is caused by a change in external pressure. 3)The internal pressure fluctuation of tile with lifting could be generally estimated by spatially averaging the external pressures through the whole roof of each side. But the internal pressure is strongly affected by the local external pressure in a area where the re-attached flow blows into the space under the tiles through the gap.
Next, wind force distributions on roof were probed by wind tunnel tests in detail. And loading distribution patterns for static loading test were determined according to the result of the wind tunnel test.
Finally, the relationship between the wind force and lifting value of tiles were clarified by the static loading test.
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