【作者】 刘志刚；

【导师】 何炎平；

【作者基本信息】 上海交通大学 ， 船舶与海洋结构物设计制造， 2007， 硕士

【摘要】 为严格控制向海洋倾倒废弃物,防止对海洋环境的污染损害,一些国家联合起来制订了《1972年防止倾倒废物及其他物质污染海洋的公约》即《伦敦倾废公约》。该公约针对向海洋弃置船舶、航空器、平台和其他海上人工构造物的行为进行了严格的限制。而在一些对环保要求较高的地区如北海,当地法律更是强制规定所有的废弃平台必须完全拆除。除此之外,大多数的海域在停止产油后仍有其他经济产出的可能性,这也需要对废弃平台进行清理。因此,在海上油气开发的后期,对废弃平台的拆除工作必不可少。GM-Lift平台就是为解决这一工程实际问题而开发设计的。GM-Lift是一种不同于传统半潜式平台的新型拆卸安装多功能平台,分析其功能结构特点,提出相应的结构设计指导性意见,这对于今后我国自主开发此类新型半潜式平台具有重要的经济价值和学术价值。本文首先介绍了GM-Lift的功能特点,对该平台与传统半潜式平台进行了结构差异分析,并论述了其结构设计和强度衡准准则的特殊性;随后以平台立柱为研究对象,应用DNV规范的经验公式,采用载荷与抗力系数法(LRFD法)对立柱壳板的最小厚度、骨材的最小剖面模数进行了规范计算和校核,以验证结构设计的合理性;为了准确把握结构在设计载荷作用下的应力应变情况,本文接着运用Patran/Nastran有限元计算软件对立柱结构进行了静强度分析,计算出了GM-Lift平台立柱在最不利工况即工况4下遭受0o到180o每隔15o浪向的波浪载荷作用下的结构响应,并对计算结果进行了评定和分析。针对热点区的应力集中现象,更多还原

【Abstract】 For keeping a tight control over the dumping of wastes into the ocean so as to prevent pollution damage to marine environment, some countries enact“Convention on the Prevention of Marine Pollution by the Dumping of Wastes and other Matters, London, Mexico, Moscow, Washington, 1972”together. In the convention, the activities to discharge of vessels, aircraft, platforms and other man-made structures used on the sea should be controlled strictly. And in some countries especially in the North Sea, the local Legal prescribes compulsively all the platforms should be completely removed. Anymore, Majority of fields will have continued economic production possibility. Therefore, the work to decommission platform is necessary in the evening of offshore oil industry. And GM-Lift is aimed to solve such engineering problems.GM-Lift is a novel decommissioning and installation simisubmersible different with the traditional simisubmersible. There is a great economical and learning meaning through advancing the guidance to structural design based on analyzing its functional and structural characteristics for developing independently such kind of simisubmersibles in our country. This dissertation work mainly investigates the following contains:At the first, the paper described GM-Lift functional properities, did a comparation study of structural differences between GM-Lift and traditional semi submersible rig and expatiated its specialties in structural design and strength criteria principle.Secondly, the column of simisubmersible was taked as research object in this paper, and then the minimum thickness of column shell and the minimum section modulus were caculated and checked by the load and resistance factor更多还原