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A wind force acting on a structure under a gusty wind with a very short rise time, which occurs in high winds associated with typhoons and tornadoes, occasionally reaches a large value not seen in a s...teady wind flow. We call it "overshoot phenomenon of wind force”. Several reports of the unsteady pressure distributions around a gable roof structure under a short-rise-time gust are known. However, the effects of its roof pitch on drag and lift forces acting on such a structure under a short-rise-time gust have not been systematically studied. In this study, the properties of unsteady wind force on gabled structures with different size of roof pitch were investigated using gusty wind tunnel test. It was found that the overshoot coefficients of drag and lift forces acting on a 1/4 roof pitch gable become bigger than a 1/2 roof pitch gable.show more
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