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The properties of unsteady wind pressure on a flat roof body and a gable roof body subjected to a short-rise-time gust were investigated using a gust wind tunnel. We devised a pressure measurement method applicable to a rapid change of static pressure in a wind tunnel generating a short-rise-time gust. We confirmed a remarkable overshoot phenomenon of wind pressure generating a much larger wind pressure than in a steady flow. The peak wind pressure coefficient was evaluated by a non-dimensional rise time composed of the rise time, the gust wind speed and the body size.

UNSTEADY WIND PRESSURE ON A BODY UNDER SHORT-RISE-TIME GUST