臺灣博碩士論文加值系統

水下隧道、輸油管、工業原料輸送管…等近岸結構，可能受到地震或石油、礦產開採之爆破工程中所產生震波所損壞，因此如何對抗爆炸而產生的震波為管路整體結構安全重要的一環，如何增加水下管路結構抗震能力則為極其重要之工作，目前增加水下管路抗震的方式有從管路材料、結構構型、外加防護殼以及外包覆材料等方式著手。本論文採用外包覆方式增強水下管路之抗震能力為研究對象。
首先，本論文應用非線性有限單元ABAQUS/USA軟體進行Kwon等人[13]研究之遠場側炸圓筒殼的動態反應作為驗證實例，其次，探討未包覆與包覆之水下管路結構承受爆震波之動態反應差異，研究內容包括沒有任何防護結構的水下鋼管、外層包覆混凝土防護層之水下鋼管、埋入海床沙中之外包覆混凝土防護層的鋼管、在內部充滿水的情況下外包覆混凝土防護層再埋入海床沙中之鋼管;並與Gong等人[16]等人之數值結果比較討論。本論文之研究成果應可提供水下管路設計參考應用。

In many engineering situation concerning off shore structures of a great importance (pipelines, underwater tunnel crossings in oil industry), their resistance against the load produced by underwater explosions is an important component of the entire structure’s safety. This thesis is related to the analyses of an underwater pipeline protected by an external covered concrete subjected to an explosion close to the external protective structure.
At first, the nonlinear dynamic response of a cylinder subjected to a side-on, far-field underwater explosion was studied using the finite-element computer code ABAQUS/USA in this paper. This study showed the numerical results compared with Kwon et al. [13] experimental data. And then, this paper studied the safety assessment of submerged pipelines, exposed to underwater shock. Four cases of pipeline configurations developed by Gong et al. [16] were modeled and simulated. The first case is a submerged empty pipeline without any cover, the second case is a submerged empty pipeline with concrete cover, the third case is an empty pipeline buried in sand and the fouth case deals with a fluid-filled pipeline buried in sand. The numerical results obtained for four pipeline configuration were compared and discussed in order to find the best protection.

第一章 緒論
第二章 ABAQUS/USA基本理論
2.1 ABAQUS軟體功能[20][21]
2.2 ABAQUS/USA之基本理論[20][21]
2.2.1 流體方程式(Fluid-surface equations)
2.2.2 流固藕合方程式(Coupled fluid-structure interaction equation)
2.3 ABAQUS/USA 於水下爆震之分析技巧
2.3.1 前處理
2.3.2 ABAQUS/USA主程式處理器
2.3.3 有限元素種類
2.3.4 邊界條件
2.3.5 ABAQUS/USA收斂準則
2.3.6 後處理
2.4 爆震波之經驗公式
第三章 數值驗證–水下圓筒殼之抗震研究
3.1 問題描述
3.2 有限元素模型
3.3 數值分析
第四章 實例分析–水下管路之抗震分析
4.1 問題描述
4.2 有限元素模型
4.3 結果與討論
4.3.1 水下管路置於海床之上
4.3.2 水下管路埋於海床之中
第五章 結論與未來展望
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