| Project/Area Number |
61550419
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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 |
Building structures/materials
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| Research Institution | KANAGAWA University |
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Principal Investigator |
OHKUMA Takeshi KANAGAWA Univ. Professor, 工学部, 教授 (50078317)
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| Co-Investigator(Kenkyū-buntansha) |
MARUKAWA Hisao KANAGAWA Univ. Research Assistant, 工学部, 助手 (80192350)
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| Project Period (FY) |
1986 – 1987
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| Project Status |
Completed (Fiscal Year 1987)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1987: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1986: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | Larg span roof / Full scale measuremnt / Powered oscillation Re-attachment / Mean pressure / Fluctuating pressure / Quasi-static pressur / 準静的風圧力 / 非定常風圧力 / 大スパン屋根 / 非定常空気力 / 再附着 / 剥離泡 / 剥離せん断層 / 強制振動 |
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| Research Abstract |
On chracteristics of wind preesure large span roofs. following resuits were obtained though wind tunnel tests. 1) Chracteristics of fluctuating wind pressures are effected by the re-attachment Point of separated flow over the roof. 2) Powerspctra of fluctuatinf g wind presures indicate peaks at the characteristic frequencys in cases of flat and sag roofs but for high rise roofs they have no predominant peak and are simlar to velocity powerspectra of oncoming flow. 3) Fuctuating wing pressures in the leeward of the the re-attachment point are convective with exponential decay of the corrlation. 4) Powerspectra of motion-induced wind pressures have predoinant peaks at the frequency of the motion and values of the peaks increase as the motion frequency close to the vortex shedding frequency.
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