浮上りが生じた瓦に作用する風圧力の性状 : 実大建物による屋根瓦に作用する風力に関する研究その2

概要

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Considering a condition of roof tiles in which just before the tiles fly apart from a roof in a strong wind, they are flattering and lifted. Then it is expected that the peak forces on the tiles are different from those on tiles without lifting. In this paper, it is clarified that the negative peak force coefficients on tiles increase due to tiles' lifting through full-scale measurements with tiles lifted artificially. The increase is caused by the change of the external pressure in the region where flows separate from the edge of roof. For tiles in the region where the separation flow reattaches, the increase is caused by the change of the internal pressure. Then the negative peak forces are estimated from the fluctuating external pressures over the roof by the quasi-static method. The estimations for the tiles in the region where the flows separate are in good agreement with those obtained from the full-scale measurements. But for the tiles in the region where the flows re-attach, the negative peak forces are underestimated because the local fluctuations of the internal pressure are neglected.
2007-12-30