3 次元角柱のギャロッピングに対するアスペクト比の影響について

概要

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Galloping oscillations have been studied by Parkinson, Laneville, Novak et al. In their studies the good agreements between the quasi-static theory and the experimental results on the two-dimensional models of square prisms were found. The galloping instability affected by the aspect ratios which are the values dividing the height by the front width of the prisms having several rectangular cross sections are investigated in this paper. The galloping response curves are described by solving an algebraic equation based on the quasi-static theory. The results can be summarized as follows. The galloping instability of square and rectangular prisms with broad faces across flow direction (side ratios of 2〜3 of the section) is not so much variable with the increase of the aspect ratio. On the other hand, the galloping of rectangular prisms with broad faces in flow direction (side rations of 0.5〜0.33) becomes more unstable with the increase of the aspect rations. The turbulence in the flow can change the aeroelastic stability of prismatic bodies. With the rectangular cross sections of the side ratios of 0.5〜0.33 the tendency to galloping instability vanishes with the turbulent intensity of 13%. The square prism and the rectangular prisms with the side ratios of 2〜3 are stable in the smooth flow but not in the tubulent flow.
社団法人日本建築学会の論文
1980-06-30