離岸風力發電機的基樁會使用大口徑單樁，現在一般都為5m以上，但將來有可能會設計成10 m甚至更大，但傳統的p-y曲線可能並不適合於大口徑單樁，這對於風機底座設計在承受各種外來因素之影響是否安全，是台灣開發離岸風力發電的一個重要課題。本研究假想一砂土層，採用ABAQUS模擬，分析5種相同長度(25 m)，不同樁徑(8 m、5 m、2.5m、1.67 m及1 m)，即長徑比為3.125、5、10、14.97和25之鋼管單樁在承受單一側向載重下的行為，找出樁頭及樁身位移，剪力及彎矩，再以LPILE的分析結果作為比對。
經分析顯示，ABAQUS之分析結果和LPILE的存在差異；但樁頭位移誤差隨長徑比增加(即樁徑減少)而減少；樁身剪力是隨長徑比增加(即樁徑減少)而誤差增大，樁身彎矩亦然。本研究只採用半經驗公式和數值模擬作比對，其分析結果尚須物理試驗進行驗證。

The foundation of offshore wind turbines is currently using large diameter single pile, termed monopiles. Pile diameter of 5 m is routinely used, while for diameter up to 10 m or more, is being considered for future designs. As such, the traditional design approach of using p-y method may not be suitable for large diameter single pile. This would be an important issue for Taiwan in developing offshore wind power as the design safety of wind turbine foundation under the presence of various external factors would be affected. The research uses ABAQUS simulation, by assuming in a single sand layer, the single lateral loading behavior of 6 different steel pipe single pile diameter (8 m, 5 m, 3.6 m, 2.5 m, 1.67 m and 1 m) with identical length (25m) , with respect to the related length-diameter ratio as 3.125, 5, 6.944, 10, 14.97 and 25 were studied. The displacement, shear force and bending moment was found in each pile section, followed by comparing the result of LPILE analysis. The result shows that there are variations between ABAQUS and LPILE analysis. The error of pile head displacement decreases with decreasing pile diameter, whereas the error of shear force and bending moment increase with decreasing pile diameter.

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