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摘要船用固桩架是自升式海洋平台升降系统中的重要组成部分，是一个结构复杂，承受重载的大型海洋装置的机械结构，其强度大小对海洋平台整体的安全性具有极其重要的影响。在高达数千吨的负载长时间作用下，固桩架出现屈服破坏的可能性较大，尤其是用于升降装在固桩架上的轴承部位，因为自升式海洋平台是利用固桩架和齿轮将长达50几米的桩腿升到固定的位置，所以必须要对该结构进行强度校核，以保证其能正常的工作。另外固桩架的尺寸也非常庞大，下文的实例中的固桩架就是一个7500×8400×9000（cm）的相对较大的机械结构，因此它的质量也很重，所以说减轻它的质量以节省材料也是一个要研究的问题。本文以一自升式海洋平台中的固桩架为例，对其进行优化，主要是以减轻重量为目的，并且减轻重量的同时，改变其加强筋，然后用ANSYS软件对改变后的固桩架进行有限元分析，与先前的作比较，优化出一个质量较轻且能正常工作的固桩架。其中涉及到的模型都用PRO/E软件去建模的。50070
本文提出的固桩架ANSYS分析法实用，简便，对海洋平台的结构设计和安全评估具有一定的实际参考价值。
毕业论文关键词:自升式海洋平台；固桩架；有限元分析；优化
Abstract The ship with the solid pile frame is in the jack up sea platform jacking system important constituent, is a structure is complex, the withstanding heavy load large-scale sea installment mechanism, its intensity size has the extremely important influence to the sea platform whole security. In reaches as high as under several thousand ton load long time effect, the solid pile frame appears the yield failure the possibility to be big, uses in rising and falling in particular installs on the solid pile frame the bearing spot, because the jack up sea platform will be uses the solid pile frame and the gear is long reaches more than 50 meters spud legs to rise to the fixed position, therefore will have to have to carry on the intensity examination to this structure, will guarantee its can the normal work. Moreover the solid pile frame size extremely is also huge, in as follows example solid pile frame is a 7500×8400×9000(cm) relative big mechanism, therefore its quality very is also heavy, therefore said reduces its quality to save the material also is the question which must study. This article take a jack up sea platform in solid pile frame as an example, carries on the optimization to it, mainly is take reduces the weight as the goal, and reduces the weight at the same time, changes its stiffener, then to changes after with the ANSYS software the solid pile frame to carry on the finite element analysis, with formerly did compares, optimizes a quality to be light also can the normal work solid pile frame. In which involves the model all uses PRO the E software to go to the modeling. This article proposed the solid pile frame ANSYS analytic method is practical, simple, has certain actual reference value to the sea platform structural design and the security evaluation.
Key word: Jack up sea platform; Solid pile frame; Finite element analysis; Optimization
目录
第一章 绪论 1
1.1选题的目的和意义 1
1.2.1国内外海洋平台的现状 2
1.2.2海洋平台固桩架的未来发展趋势 3
1.3本论文的研究意义和内容 4
1.4本章小结 4
第二章 海洋平台和固桩架的简介 5
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