1987 Fiscal Year Final Research Report Summary

Chracteristics of Vibraition-induced Wind Forces on Large Span Roofs

Research Project

Project/Area Number	61550419
Research Category	Grant-in-Aid for General Scientific Research (C)
Allocation Type	Single-year Grants
Research Field	Building structures/materials
Research Institution	KANAGAWA University
Principal Investigator	OHKUMA Takeshi KANAGAWA Univ. Professor, 工学部, 教授 (50078317)
Co-Investigator(Kenkyū-buntansha)	MARUKAWA Hisao KANAGAWA Univ. Research Assistant, 工学部, 助手 (80192350)
Project Period (FY)	1986 – 1987
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
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.