[[alternative]]CFD Applications on the Wind Resistant Design of Tall Buildings

[[abstract]]本研究探討計算流體力學(CFD)對於高層建築初步設計風力評估之適用性。本研究以高雄八五大樓為例，分別以風洞實驗及計算流體力學模擬，計算其順風向風力及風壓分佈，並與規範計算結果進行比較，評估該大樓之設計風力。在計算流體力學模擬部分，採用商用計算軟體STAR-CD進行模擬，紊流模式則使用近年發展之V2F紊流模式進行計算。文中針對一測試題目驗證該紊流模式之準確性。風洞實驗採用1/350縮尺壓克力模型進行模擬，利用多頻道風壓感應器量測其表面風壓進而計算其整體風力。根據計算比較結果顯示，CFD計算值稍低於風洞試驗值。而與規範設計值比較上，CFD計算較能掌握非矩形或非均勻斷面建築在不同高度之風力變化特性。故在進行高層建築初步設計時，CFD計算結果應可提供建築師在建築外型初始設計階段，對於風力效應之參考。[[abstract]]This paper investigates the appropriateness of the CFD simulation on the design wind loads of a tall building in the preliminary design stage. An isolated 85-story building was selected for this purpose. CFD study was carried out to evaluate structural design wind loads. During the numerical simulation, the V2F turbulence model and commercial CFD software, STAR-CD, was used for the numerical simulation. In order to validate the CFD results, wind tunnel test was performed. This investigation indicates that the CFD technique can be used to predict the mean wind load of an isolated tall building with reasonable accuracy, therefore, suitable for the purpose of preliminary building design.[[sponsorship]]中華民國結構工程學會；營建技術服務暨材料檢測中心；交通部公路總局[[conferencedate]]20060901~20060903[[booktype]]紙本[[iscallforpapers]]Y[[conferencelocation]]臺北市, 臺