目前全世界僅少數的海上風力發電場坐落在地震發生區。海上風力發電機組的支撐結構受震反應評估是很重要的初步設計階段，包含認證和預警安全系統的技術發展
。海上風力發電機組支撐結構的動態特性不僅取決於材料的性能和支撐結構的尺寸，更需考慮結構 - 土壤互制之影響。在目前運轉中的海上風電場大多採用單樁基礎的設計。本文應用拉格朗日能量方法(Lagrange energy method)評估離岸風力發電機支撐結構的動態特性和受震反應。支撐結構的反應受加載頻率和動態土壤阻尼之影響甚巨。本文考慮結構與土壤互制以Winkler土壤模型為基礎，並修正動態土壤性質，將其應用於風機支撐結構受動態簡諧外力加載之分析模型。觀察加載頻率的變化，找出靜態土壤性質與動態土壤性質的適用範圍。目的在於使用動態簡諧外力的反應來模擬地震力之影響。藉此評估對離岸風機結構受地震作用之反應。

The main purpose of this study is to analyze the dynamic response of offshore wind turbines under dynamic loads. In order to estimate the shutdown standards, we use the results of the study and set the limit state of the wind turbines during the earthquake. In this paper, we use the p-y curve method and Winkler model for analysis. It can be obtained from the conclusion of the analysis when the load is low frequency. You can use the static soil stiffness. When the frequency of the load is high, we must use the dynamic soil stiffness. Using existing natural vibration frequency of fast computing model to adjust the rotation stiffness., using the model of this paper are expected to achieve rapid calculation of the structure of the natural vibration frequency.

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