本研究結合生命週期內各成本與可靠度分析，求出一高層建築物的最佳設計風速，並探討參數變異性對最佳設計風速的影響。所謂最佳設計風速除了符合安全性及舒適度的要求外，也使生命週期總成本最低；其中以層間變位角做為安全性指標，以頂層加速度作為舒適度指標。本研究在執行可靠度分析時，以快速積分法同時考慮隨機過程及隨機變數的不確定性，結合蒙地卡羅模擬及首次超越理論求解層間變位角超越機率；結合重點取樣法、反應曲面法及隨機振動尖峰理論求解頂層加速度超越機率；透過調整反應曲面尺度及重點取樣密度，可提升超越機率準確性及收斂性。本研究先在各項不易決定的參數為標準情況時，求解最佳設計風速，接著觀察不同參數組合如何影響最佳設計風速。其中，目標可靠度、自然頻率與風力控制構件成本比例對最佳設計風速對最佳設計風速的影響較其它參數顯著，其中又以目標可靠度最敏感。

This research combines the concepts of Life Cycle Cost (LCC) and Reliability analysis, to determine optimal design wind speed of the tall building, and discuss the influence of some parameters to the optimal design wind speed. The optimal design wind speed is the wind speed that, both reliability constraints about safety and comfort are satisfied, and the expected LCC is minimized. This research combines Monte Carlo simulation, fast integration method and first passage theory to determine the failure probability(drift ratio), and combines importance sampling method, fast integration method, response surface method and Shinozuka's theory to determine the failure probability(top acceleration), considering the uncertainties of random variables and random processes. In this research, it is found that the optimal design wind speed is more sensitive to target reliability indices, natural frequencies and the wind-controlled member cost ratio than other parameters, especially to the target reliability indices.

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