因應台灣風場颱風、地震等自然營力活躍之條件，凡從事海上設施之開發，均須歸納一套完整而嚴謹的動力分析暨驗證程序，以預測構造物基礎於擬風波流、地震力作用下之動態響應供設計參考，確保離岸設施之服務品質。本文以海上風機樁基礎為研究主體，利用套裝軟體DynaN v3.0以及DynaPile v2016，探討風機基礎模態分析模組化之可能，前者針對Novak軟弱夾心模型，克服介面反射問題，進行樁土互制行為之模擬；後者基於諧和邊界矩陣，利用阻抗函數與轉換函數的概念，分別演算樁(群)於輸入簡諧振盪或不規則基盤加速度，各自由度間之移(轉)動量以及振動歷時。本文規劃若干模型、進行參數研究，檢討程式之靈敏度，首先觀察單樁系統其動態勁度與響應，在不同土壤剖面、長徑比、支承條件以及質量塊大小的調動下，於頻域上之輸出趨勢，並提供基樁載重試驗之模擬以 資對照，以及群樁規模與間距的改變對樁間互制行為的影響，以期符合前人之研究、驗證程式之邏輯。最後，擇一實際風場為案例，模擬台海現場粉質砂土環境，進行基礎動力分析，並比較互層土壤模型、海床淘刷等複雜條件下，各理論與假設輸出之可靠度，並操作上部結構耦合基礎系統之響應分析，確保多振源作用下，風機塔架自然頻率落在安全的範圍內，以及輸入地震力時，基礎之折減效益，提供日後結構耐震設計與勁度衰減研究之參考參數。期望有關之振動分析模組研究，俾利推動我國離岸風機水下結構關鍵技術之開發。

Not like the steady environment of European wind farms, in order to overcome disasters such as typhoon and earthquake, the construction of Taiwanese offshore wind turbines requires rigorous and complete analyses of foundation dynamic responses. The objective of this paper is to modularize the calculation of pile stiffness and damping in all degrees of freedom (i.e., vertical, sliding, rocking, coupling or torsional vibration) using DynaN v3.0 and DynaPile v2016. One is based on the Improved Novak’s Method which a non-reflective boundary is introduced to obtain a more realistic model that accounts for non-linear effects; the other one is based on the Consistent Boundary Method including the techniques of Soil-Structure Interaction and transfer functions that are related to the computation of kinematic responses excited by seismic loading. Following is the parametric study conducted by several models with variation of soil profiles, pile rigidity, slenderness, boundary conditions and different layouts for pile groups. Once the modeling of dynamic behavior as well as group effect of piles meets the results determined by other experiments or numerical researches on frequency domain, both the charts and tables produced by programs are confirmed. Besides, the case study is necessary. Considering a 3.6 MW wind turbine located on Fuhai offshore windfarm, Changhua City, the simplified model set according to design data and borehole reports has been analyzed. Dynamic responses due to periodic wave load or real seismic events could be estimated by programs instead of in-situ measurements and provide the information for improvement of wind turbine foundations more accessible.

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