臺灣博碩士論文加值系統

近年來臺灣積極推動各項綠能建設，離岸風電為其中之一，豎立在台灣海峽的離岸風機，可能遭遇到環境中颱風、地震、海浪洋流等影響，也可能遭受不同船舶的撞擊，各種因素可能造成離岸風機結構損壞而有安全疑慮甚至造成風機無法運行。本研究根據NREL-5MW-OC4Jacket的風機結構進行分析，假設離岸風機支撐結構斜支撐和腿支撐遭船舶撞擊後發生勁度的折減，以及結構桿件因海水腐蝕造成的面積折減，運用結構再分析理論耦合基底向量法及非耦合基底向量法計算靜力和動力情況下桿件受損後節點位移變化量，評估結構是否安全。

In recent years, Taiwan has actively promoted various green energy constructions, and offshore wind power is one of them. Offshore wind turbines erected in the Taiwan Strait may encounter influences such as typhoons, earthquakes, ocean waves, and currents in the environment. They may also face collisions with different vessels. These factors can potentially cause structural damage to offshore wind turbines, resulting in safety concerns and even rendering the turbines inoperable. This study analyzes the structure of offshore wind turbines based on the NREL-5MW-OC4Jacket model. It assumes that the stiffness of the bracing structure, both inclined bracing and leg bracing, decreases after being struck by a vessel, as well as the area reduction of structural members due to corrosion from seawater. Structural reanalysis based on coupled and uncoupled basis vectors are used to calculate joint displacements of damaged structures under static and dynamic conditions to evaluate the safety of structures.

摘要 i
ABSTRACT ii
目錄 iii
表目錄 v
圖目錄 vii
第一章 緒論 1
1.1 研究動機及背景 1
1.2 文獻回顧 2
1.3 章節概述 3
第二章 結構再分析理論 4
2.1 靜力分析 4
2.1.1 二項式級數 5
2.1.2 計算基底向量 6
2.2 靜力再分析 7
2.2.1 耦合基向量 7
2.2.2 靜力再分析利用耦合基底向量求位移 8
2.2.3 非耦合基向量 9
2.2.4 靜力再分析利用非耦合基底向量求位移 11
2.3 動力分析 12
2.3.1 增量表達式 13
2.3.2 動力再分析 14
2.3.2.1 動力再分析耦合基底向量求位移 14
2.3.2.2 動力再分析非耦合基底向量求位移 15
第三章 簡單結構再分析應用 16
3.1 一維三彈簧串聯系統 16
3.1.1 三彈簧串聯勁度矩陣推導 16
3.1.2 三彈簧串聯例題應用 17
3.2 二維桁架系統 19
3.2.1 傾斜桁架桿件勁度矩陣推導 19
3.2.2 平面桁架結構 21
3.2.2.1 三角形桁架結構 21
3.2.2.2 靜不定桁架結構 25
3.3 比較再分析方法收斂性 28
第四章 離岸風機套管式(Jacket)支撐結構再分析 29
4.1 靜力再分析 31
4.1.1 Jacket結構斜支撐遭船舶撞擊後的位移量 32
4.1.2 Jacket結構腿支撐遭船舶撞擊後的位移量 37
4.1.3 腐蝕造成支撐結構管徑折減 45
4.1.4 計算效率的比較 57
4.2 動力歷時再分析 58
4.2.1 支撐結構斜撐桿件遭船撞擊 60
4.2.2 支撐結構腿支撐桿件遭船撞擊 64
4.2.3 腐蝕造成支撐結構桿件面積折減 71
第五章 結論及未來展望 76
5.1 結論 76
5.2 未來展望 77
參考文獻 78

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