在某一個來風方向下，建築物同時受到順風向風力、橫風向風力與扭轉向風力的作用，但三向風力最大值並不一定同時發生。本研究所考慮之總風力載重效應為三向風力效應之純量組合，總風力載重效應最大值的平均值分別以CQC法與AIJ(2004)橢圓圖形法求得，其中三向反應之相關係數與風壓特性和結構特性有關係。分別利用風洞實驗與計算流體力學模擬(CFD)之不同高寬比建築表面風壓歷時，求得三向風力自頻譜與交頻譜，再考慮不同建築物的特性與設計風速，去計算順風向、橫風向及扭轉向風力所產生效應之間的相關係數；此係數對風力自頻譜與交頻譜非常敏感，所以風力自頻譜與交頻譜的正確性相對重要。最後比較AIJ(2004)橢圓圖形法與CQC法所得之的總載重效應組合。

A building suffers along-wind load, across-wind load and torsional wind load simultaneously. However, their maximum values usually do not occur at the same time. In this study, wind load spectra and cross spectra are computed based on the wind pressures on building surfaces from wind tunnel tests and computational fluid dynamics (CFD) analyses. Scalar wind load effects are combined by Complete Quadratic Combination (CQC) method and AIJ(2004) method. The correlations among along-wind, cross-wind and torsional responses are considered. The respective correlation coefficient depends on the normalized wind spectra/cross spectra, the fundamental natural frequency and damping ratio. It is especially sensitive to the wind spectra. Finally, the results of AIJ (2004) method and those by CQC method are compared.

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