Acting Effects of Roof Pitch of a Gabled Structure on Wind Force on under a Short-rise-time Gust

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  • 立ち上がり時間の短い突風を受ける切妻屋根形状物体の風力特性に及ぼす屋根勾配の影響
  • タチアガリ ジカン ノ ミジカイ トップウ オ ウケル キリズマヤネ ケイジョウ ブッタイ ノ フウリョク トクセイ ニ オヨボス ヤネ コウバイ ノ エイキョウ

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Abstract

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 steady 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.

Journal

  • 都市・建築学研究

    都市・建築学研究 23 21-26, 2013-01-15

    Faculty of Human-Environment Studies, Kyushu University

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