離岸風機基礎設計須能夠抵抗極端風況下之風力、波浪力與潮流之荷載，在離岸工程中一般常1-g縮尺模型試驗進行動態分析，然而在1-g縮尺模型試驗下會存在縮尺效應，須由數值分析與物理試驗進行驗證，本研究中使用數值分析法簡化風波流為等值力作用於離岸風機結構，並考慮縮尺群樁受側向力之動態土壤-結構互制行為。側向載重樁常見之分析模式有極限分析法、地盤反力法以及數值分析法，而常見基樁之破壞模式有樁身彎矩達降伏應力產生塑性鉸以及周圍土壤發生剪力破壞，樁基礎上方之結構亦不得產生超過設計與規範之位移，本研究以ABAQUS數值分析軟體進行單樁單向荷載與LPILE之分析結果進行比對，數值模型分析結果顯示單樁變形行為位於合理範圍內，而後進行單樁單向於不同彎矩勁度下之縮尺數值分析，結果顯示彎矩勁度的改變對土壤反力影響不大，而不同勁度會影響樁身變位以及彎矩分佈，單樁於單向週期荷載分析中則觀察到永久位移累積的現象，再以縮尺單樁組成群樁基礎，並進行極端風況之風波流作用下群樁基礎縮尺行為分析，其結果顯示極端風況下風力造成之位移約佔90%風機整體位移量，考慮波浪與風向同向而潮流方向則與之正交，在潮流作用下會使群樁平台產生些微扭轉，而潮流力在分析中為最小的作用力，對於群樁整體反應所佔比例很小。本研究簡化了幾何模型與外力條件以用於數值分析，其分析結果尚須物理試驗進行驗證。

This research is focus on responses of scale-down offshore wind turbine foundation that subjected to wind and wave loadings. Finite element method is adopted to analyze both static and dynamic behaviors of group piles of offshore wind turbines that suffer complicated loadings. The Abaqus code is used in this study to solve complicated and highly non-linear problem including soil-structure-soil interaction that is the center part of pile foundation analysis. Both scale-down and non-scale-down model analyses with the same loadings and boundary conditions are performed and compared to investigate the scaling effect. The results show that the numerical model of single pile under lateral loading is close to the results of LPILE based on p-y method. Scaling down model with different stiffness change the displacement and moment distribution of the pile in same soil property and slightly increase the soil lateral ultimate capacity. Results of group pile under extreme wind and wave loadings reveal that the responses of piles is dominated by wind force and the wave loadings only induces minor effect on the overall system. Last, this research recommends the stiffness reduction ratios for scale-down group pile model design.

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