中文摘要


本研究主要是要探討大型海底管線結構在海洋環境中受到環境外力作用後的動力行為分析。其中，對於結構的部份，本研究主要以納入高分子黏彈性阻尼材質為管線夾層所組成的三層（上、下層為鋼質層）複合式管線為考量；而在理論的部份則採用了Reddy於1984年針對複合材質結構物所提出的高階剪變形理論（HSDT）並延續Lee（1994）對於黏彈性阻尼材料應用在海洋結構中的研究，來探討於管線結構中加入阻尼材料後，結構物的振動情形及減振效果…等動力性能。
本研究在結構區分上大致分為一般管線結構和海底管線結構二部份。在一般管線結構的分析上主要針對管線結構物的管徑大小、管身長度、黏彈性材質的厚度…等幾何條件來探討，於作用外力上則分為高頻和低頻二種外力型式；在海底管線結構的分析上則主要針對管線結構物的放置水深、受力型式（分為水平波浪力和揚升力二種）、波浪週期和波長…等環境因素為考量範疇。
研究中主要以理論推導為主，並配合數值計算，針對上述管線結構物，考慮以黏彈性阻尼材料複合組成的情況下，比照單一材質組成之管結構體，受到外力作用時，其振動、變形及整體動力行為作一探討。並進一部尋求改善其動力性能的方法，而達到延緩結構破壞、延長海底管線壽命，進而達到減災、防災之效果。

英文摘要


The research is to investigate the dynamic behavior for the large undersea pipeline structure system subjected to the wave force. In this study, the primary structure is composed of two steel layers and one viscoelastic layer modeled as a three-layered pipeline structure in composite type.
The theory of this study is based on Reddy’s“High-order Shear Deformation Theory”and continues Lee’s research on VE materials applied in the engineering structures to discuss the dynamic behavior and the ability of VE materials to restrain the vibration.
Based on the theory derived, the analytical results of vibration, deformation of the pipeline and the dynamic behavior for the whole pipeline system are obtained and discussed, in order to improve the dynamic performance for pipeline system and eventually to upgrade the durability of the system.
This thesis is divided into two parts for pipeline structures — the general pipeline structures and the undersea pipeline structures. For the general pipeline structures, the study focuses on the effect of the vibration mitigation due to the variation of the diameter of pipelines, length of pipelines and thickness of the viscoelastic material. Besides, the external forces of high-frequency loading and low-frequency loading are both applied. For the undersea pipeline structures, the depth of water, loading types (include the in-line force and the lift force), the periods of wave and the wave length of environmental effects are taken into account.

目錄

頁次
第一章 緒 論 1
1.1 前言 …………………………………………………………… 1
1.2 研究目的 …………………………………………………………… 2
1.3 本文架構 …………………………………………………………… 3

第二章 理論推述與引用 5
2.1 高階剪變形理論 …………………………………………………… 5
2.1.1 單層均質板之高階剪變形理論 ……………………………… 6
2.1.2 複合多層板之高階剪變形理論 ……………………………… 18
2.1.3 複合多層殼之高階剪變形理論 ……………………………… 20
2.2 外力項的計算 ………………………………………………………31
2.2.1 傾斜管線的波浪力作用 ……………………………………… 31
2.2.2 水平管線的波浪力作用 ……………………………………… 34
2.3 波浪理論之引用 ……………………………………………………35
2.3.1 微小振幅波理論 ……………………………………………… 36

第三章 海底管線結構物之動力分析 38
3.1 整體系統之靜力分析 ………………………………………………39
3.1.1 平衡方程式的解 ……………………………………………… 40
3.2 整體系統之動力分析 ………………………………………………41
3.2.1 結構體之勁度矩陣 …………………………………………… 41
3.2.2 結構體之質量矩陣 …………………………………………… 42
3.2.3 結構體之阻尼矩陣 …………………………………………… 43
3.3 外力項的計算 ………………………………………………………44
3.3.1 水平管線的波浪作用力 ……………………………………… 44
3.3.2 瞬間作用之固定載重 ………………………………………… 46
3.4 運動方程式的解 ……………………………………………………47
3.4.1 自然頻率及振態形狀 ………………………………………… 47
3.4.2 由振態矩陣求系統阻尼矩陣 ………………………………… 49
3.4.3 多自由度動力問題的解 ……………………………………… 51

3.5 黏彈性阻尼材料的應用 ……………………………………………53
3.5.1 黏彈性阻尼材料的力學特性 ………………………………… 53
3.5.2 整體系統之分析模式 ………………………………………… 55

第四章 數值結果與討論 62
4.1 管線特性及材料性質 ………………………………………………62
4.2 收斂性質驗證 ………………………………………………………62
4.2.1 不同時間區間的收斂性驗證 ………………………………… 63
4.2.2 不同位移近似值項數的收斂性驗證 ………………………… 63
4.3 動力分析–一般管線結構 …………………………………………64
4.3.1 不同外力形式作用下之位移歷時反應 ……………………… 64
4.3.2 不同管線長度結構之減振分析 ……………………………… 65
4.3.3 阻尼材質層厚度變化之減振分析 …………………………… 66
4.3.4 於相同管徑下，阻尼材質層厚度變化時之減振分析 ……… 67
4.3.5 於不同頻率諧合外力作用下之阻尼效應分析 ……………… 67
4.3.6複合材料含高分子阻尼材質時之減振分析 ………………… 68
4.4 動力分析–海底管線結構 …………………………………………68
4.4.1 波浪條件與參數 ……………………………………………… 68
4.4.2 於10米水深，不同週期之波浪力對阻尼材質效能的探討
……………………………………………………… 69
4.4.3 於20米水深，不同週期之波浪力對阻尼材質效能的探討
……………………………………………………… 70
4.4.4 於30米水深，不同週期之波浪力對阻尼材質效能的探討
……………………………………………………… 70

第五章 結 論 72

參考文獻 74

附錄 115

授權書

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