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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. Althoug...h 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.show more
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