摘要：自从第一座半潜式海洋平台自上世纪60年代初出现,其在海洋石油勘探开发中就一直得到广泛的应用。它的优点是适用工作水深广，同时抗风浪能力强，相比较于其他类型的平台更能适应恶劣海况，大部分深海半潜式平台还能适应百年一遇的极端海况，同时它的甲板面积和装载量也大，转移安装方便。目前，随着国内外油气勘探开发向深水和超深水海域拓展以及全世界范围内海洋平台建造技术的进步，半潜式平台的建造和应用过程中的各项热点问题也备受海洋工程领域的关注。本文将采用建立有限元模型的方法，通过对有限元模型施加不同情况下的载荷，之后对其进行数值模拟分析，综合模拟结果来对半潜式平台导缆孔的局部强度尽量进行较为全面的分析，目的在于通过分析明确其在各种载荷情况下的受力特征以及屈服屈曲特征等，同时验证导缆孔及周边结构和立柱结构是否具有能够承受系泊载荷的结构强度，为工程中的应用提供理论参考和结构受力情况等具有实际意义的参考资料，以便更好地解决工程应用中的实际问题。

关键词：半潜式海洋平台；导缆孔；系泊载荷；有限元模型

Abstract：Since the early 60s of last century，semi-submersible offshore platform has been widely used in the advent of marine oil exploration and development . Its advantages are applicable to the work of a wide water, strong ability to resist wind and waves, to adapt to the harsh sea conditions, and even most of the deep-sea semi-submersible platform can adapt to a hundred years of extreme sea conditions, and the deck area and loading capacity, easy to transfer installation. With the development of oil and gas exploration and development at home and abroad to deepwater and ultra-deep waters and the development of marine platform construction technology around the world, the construction and application of semi-submersible platform are also concerned. In this paper, the local strength of the semi-submersible platform guide hole is analyzed in order to clarify the variation of the force and the buckling condition under various load conditions. At the same time, it can verify that the foundation and the shell structure can tolerate mooring Load structure strength, for the academic analysis and engineering applications to provide theoretical reference data and structural forces and other practical reference materials in order to better solve the practical problems in engineering applications.

Keywords: semi - submersible offshore platform; fairlead; column structure;   Mooring load;finite element model

目录

第一章绪论 1

1.1半潜式平台导缆孔局部强度分析研究的目的与意义 1

1.2国内外学者对半潜式平台局部强度研究的情况 1

1.3主要研究内容 2

第二章研究的理论依据 4

2.1概要 4

2.2系泊系统概述 5

2.3本文的相关研究要素 6

2.3.1运用到的软件及介绍 6

2.3.2相关说明 7

2.4设计载荷和极限状态 10

2.4.1单条系泊线的断开负载 10

2.4.2所有系泊线的作业负载 11

2.5设计角度 12

第三章有限元模型 14

3.1材料