風向角を有する場合の正方形角柱に作用する振動依存風力とその評価

概要

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Evaluation of aerodynamic instability when wind blows aslant to a building has become increasingly important with progress in aerodynamic control of buildings. However, no evaluation method has yet been established for this case, although an evaluation method has been proposed for the case where wind blows normal to a prism. This proposed method uses a vibration-induced wind force coefficient as an index. This paper proposes an evaluation method for a vibration-induced wind force coefficient when wind blows aslant to a square building with and without a corner recess. The variation of vibration-induced wind force coefficient (Cf) with wind direction is clarified. Furthermore, variation of negative aerodynamic damping ratio with wind direction is clarified by transferring CI to it. The evaluation method is confirmed by comparing vibration tests results and negative aerodynamic damping ratios. It is thus confirmed that the proposed method can be applied to evaluate the occurrence of aerodynamic instabilities when wind blows aslant to a square type building.
社団法人日本建築学会の論文
2000-03-30