切妻屋根建物の風荷重に及ぼす突風の立ち上がり時間の影響に関する実験的検討

概要

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Recently railcar vehicles are often overturned by wind gusts, such as from tornadoes, and so unsteady aerodynamic forces due to gusts rising in very short times have gotten a lot of attention. Although several early studies have pointed out that increasing wind velocity in a very short time increases wind force, there are few examinations focusing on local wind pressure of structural bodies. In this paper the effects of the rise time of a step-function-like gust on the distribution of wind pressure on a gable roof structure, which is on the ground, are investigated and discussed using a specially equipped wind tunnel. We confirmed an overshoot phenomenon bringing a much bigger wind pressure than in a steady wind flow. And it was found that the overshoot magnitude increased with a decrease in the target wind velocity and rise time.
2008-01-15