摘要:海上的石油，天然气，风能等资源的开采都离不开近海结构物，近海结构物的种类有很多。由于风载荷，浪载荷，流载荷直接作用在这些近海结构物上，因此在设计建造时对这些结构物进行强度校核时非常有必要的，以保证它们的安全作业。本文将主要讨论自升式海洋平台与近海风机导管架支撑结构两种近海结构物的强度校核。

本文采用DNV开发的海洋工程专业软件SESAM/GeniE，根据相关图纸资料建立自升式平台的整体有限元模型与近海风机导管架支撑结构的有限元模型。阐述了风浪流载荷的计算的方法，本文基于斯托克斯五阶波理论，用莫里森方程算出作用在构件上的波流载荷。然后对自升式平台在正常作业状态下和风暴自存状态下的总体强度按相关规范进行了校核，同时按相关规范对风机导管架支撑结构在停机自存状态下总体强度进行校核。

经计算分析，自升式平台的总体强度均符合规范要求，且自升式平台在桩腿与主船体连接处属于高应力区域，需要进行局部加强；风机导管架支撑结构在上方塔架与导管架连接处以及桩腿底部所受的应力较大，这些位置处的梁结构需进行加强。

关键词：自升式平台；导管架风机；支撑结构；有限元；总体强度分析

Abstract:Offshore oil， natural gas， wind energy and other resources are inseparable from the exploitation of offshore structures， there are many types of offshore structures.  In  this  paper， we  will  mainly  discuss  the  strength  checking  of  two offshore structures of the jack-up offshore platform and the jacket support structure of the offshore wind turbine. Due to wind load， wave load， and current load directly on these offshore structures， it is necessary to carry out the strength analysis of these structures at the time of design and construction to ensure their safe operation.

In this paper， SESAM / GeniE， a marine engineering software developed by DNV， is used to build the finite element model of the jack-up platform and the finite element model of the jacket support structure of the offshore wind turbine    according to the relevant drawing data. Based on the Stokes' fifth order wave theory， the current load acting on the component is calculated by the Morrison equation. The overall  strength  of  the  jack-up  platform  under  normal  operating  conditions    and survival  condition  is  checked  according  to  the  relevant  specifications， and   the strength of the beam element of the jack-up platform and jacket supporting structure is checked according to the relevant specification .

According to the analysis，the strength of these structures meets the requirements and the connection between the pile and the main hull is a high stress region of the jack-up platform， and needs to be strengthened locally. The force of the wind turbine jacket support structure at the connection between the upper tower and the jacket and the bottom of the pile is large， and the beam elements at these locations need to be strengthened.

Key words： jack-up platform; wind turbine; jacketed support structure; finite element; structural strength analysis

目录

第一章 绪论 1

1.1选题背景以及意义 1

1.2国内外研究动态 2

1.2.1自升式平台的强度分析研究动态 2

1.2.2近海风机导管架支撑结构的强度分析研究动态 5