本研究使用ANSYS中Fluent及Transient structral之數值模擬套裝軟體，以大渦流模式之暫態分析的方式，探討高樓結構之高度達到大氣邊界層厚度時之影響，並對入口風速加以科氏力之效應，對結構周圍之速度向量、壓力以及風阻合力等加以研究；同時，增加流固耦合之概念，將結構物分為剛體及非剛體，探討兩者之間的差異性，結構位移產生之影響；而結構模型則選為圓柱及方柱，並且增加漸縮斷面，以比較漸縮及非漸縮時，風阻合力、力矩及位移之差異；本文之驗證則採用文獻的k-ε模式與大渦流模式兩相比對，得其兩者曲線之趨勢相同。
分析之結果顯示出，方柱所受之風阻合力及力矩比圓柱來得大，因此在結構材料為非剛體時，方柱之位移結果也大於圓柱之位移；在結構斷面為漸縮時，圓柱及方柱之合力皆可有效之降低，而在位移的部分，圓柱顯示出僅在順風向位移有受到抑制，方柱則在順風向及側風向之位移皆有受到良好之抑制。故作設計時，可根據使用者之需求，選擇所需之斷面結構做為高樓結構之外形。

In the study, the wind loads induced by the aloft twisting winds on ultra-high structures approaching the atmospheric boundary layer thickness are investigated. To this end, the LES model is used to simulate the wind velocity and pressure fields around the structures numerically. Results show that the influence of the aloft twisting winds is more significant for the structures higher than 500 m. While the wind loads on the structures with square cross-section are larger than those with circular cross-section, the in- and lateral-flow deflections can greatly be reduced for the structures with shrinking square cross-section with respect to the structure height.

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