本研究是為探討套筒式群樁基礎下之離岸風機支撐結構受地震力作用下之反應，採用縮尺模型進行實驗，使用大型多軸向柔性邊界剪力試驗箱，建構一水下基礎與地盤試驗平台，製作海床沖積土層之縮尺物理模型。由文獻[2]及[3]所提供之NREL 5MW參考風機之尺寸進行縮尺模擬，以其週期為擬合目標，並且依據離岸風機支撐結構設計準則[16]所規範之，決定模型的精度。而後輸入模擬地震力至振動台，收集結構與地盤之反應，透過不同特性及PGA大小之地震力，觀察受震期間對結構物之影響，以及土壤液化對於離岸風機之影響程度，並且設置一減震系統以發展離岸風機之減震技術。而後，使用數值分析軟體SAP2000進行模擬分析，地盤之土壤彈簧設定乃根據美國石油協會(API)規範[14]設置之。實驗結果顯示，離岸風機整體結構之阻尼比落於1%~2%之間，整體結構之週期分析值和實驗值誤差在5%內，約為0.9秒。分析結果與實驗結果之比較，分析值與實驗值在PGA較小的地震作用之下誤差較小；在非長週期地震作用之下，分析值與實驗值之誤差亦較小。未來更進一步探究地盤內數據結果，可使軟體之模型更加優化，以達到使用軟體模擬分析離岸風機於地震力作用下反應之目的。

The purpose of this study is to investigate the response of the Offshore Wind Turbines on jacket foundation under earthquake. A scaled model is designed for the experiment, and a large multi-axials flexible boundary shear box is used to construct an underwater foundation and site test platform to make a scale model of seabed alluvial soil. The size of the NREL 5MW Wind Turbine is used for scale simulation, and its period is set as the fitting target, and the accuracy of the model is determined according to the specifications.
Then making simulated seismic force as input and placing the specimen on the shaking table to conduct the experiment. Collect the responses of structures and sites and observe the influence of soil liquefaction on offshore wind turbine through different characteristics and magnitude of PGA. After a series of experiments, the numerical analysis software SAP2000 was used to simulate and analyze the experiment results. Among them, the soil spring setting of the site was set according to the American Petroleum Institute (API) specifications.
The experimental results show that compared with the experimental results, the errors between the analytical and experimental values are smaller under the smaller PGA earthquakes and smaller under the non-long-period earthquakes.
In the future, further exploring the results of the site data will make the software model more optimized, to achieve the purpose pf using software to simulate and analyze the response of offshore wind turbine under seismic force.

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