【作者】 王永刚；

【导师】 刘刚； 王治安；

【作者基本信息】 大连理工大学 ， 船舶与海洋工程（专业学位）， 2016， 硕士

【摘要】 浮式生活平台,简称FAU (Floating Accommodation Unit),是一款能为钻井和生产储油装置等提供起居、饮食、娱乐、仓储等生活设施方面的服务和辅助支撑功能的浮式辅助生活平台,已逐渐成为海洋工程装备建造市场的热点之一。疲劳损坏是船舶及海洋工程结构的主要破坏形式之一。长期以来,船舶与海洋工程界内人士就一直密切关注和研究结构的疲劳断裂问题。目前,针对各种船型、柱稳式半潜平台及自升式平台结构的疲劳强度评估都做出了深入研究和探索,而针对圆筒形平台结构的疲劳问题研究相对不足。圆筒形浮式平台结构,包括圆筒形浮式生活平台,相对于其他类型平台具有其独特性,其环形结构有很多水平桁材趾端,特别是吃水线附近结构,由于承受较大的交变波浪动载荷,容易引起应力集中而导致结构疲劳损坏。本文研究对象为一座由FPSO改装的圆筒形浮式生活平台,为有效降低平台垂向运动,在原有箱型舭部结构基础上添加一环形开放裙摆式阻尼板结构,其半径明显大于主船体结构半径,在有效降低平台垂荡幅度的同时,也承受巨大的波浪动载荷和弯矩,舭部结构与主船体连接的区域极易引起疲劳损坏。作为一座生活平台,保证平台上生命与财产安全尤其重要,校核其疲劳强度势在必行。文章针对目标生活平台结构,结合DNV船级社的船舶疲劳规范和离岸结构物疲劳分析指南,结合使用简化疲劳算法和谱分析法,借助SESAM软件分别对其吃水线附近的结构和新旧组合箱型舭部结构进行疲劳强度评估研究,针对原有疲劳强度不足的结构提出改进方案和新的结构形式。研究结果表明新增舭部阻尼结构满足其减小平台垂向运动的疲劳强度要求,为圆筒形浮式生活平台的设计建造和改装提供参考,对实际工程有重要意义。更多还原

【Abstract】 FAU(Floating Accommodation Unit) is an auxiliary Accommodation unit, which can both provide service of living facilities for Marine fixed facilities, Spar platform, FPSO(floating production, storage offloading), such as accommodation, food, entertainment, warehousing, and offer auxiliary support for the whole process of oil and gas field development, gradually becomes one of the hot spots in the marine engineering equipment building market.Fatigue is one of the most important failure modes in ship and offshore structures. Fatigue strength assessment of ship and offshore structures has always been the concern of the ship and ocean engineering for many years. At present, further research and exploration has been made for fatigue strength assessment of ship, the Column-Stabilized semi-submersible and jack-up platform structures, while the research of fatigue strength assessment for cylindrical platform structures less relatively. The cylindrical platform, including accommodation unit, has special structures different from other types of platforms, which have many toe ends in horizontal ring stringers. Due to the high dynamic loads, the stresses in those structures are more likely to concentrate then lead to fatigue damage, especially that closed to draft waterline. The research target of this paper is a cylindrical floating accommodation platform, which is converted from a FPSO. In order to reduce the heave motion amplitude, a new ring skirt bilge structure offering greater damping has been added to the original bilge box structures. The new bilge structures has a significantly larger radius than main hull, which can effectively reducing heave amplitude, as well suffered huge dynamic load and bending moment from waves. So fatigue damage are easy to generated in the connection structures between the main hull and bilge box. As an accommodation unit, it’s particularly more important to guarantee platform of life and property safe, and very imperative to check the fatigue strength.The paper aims to a cylindrical accommodation platform building in shipyard. Based on DNV-rules (fatigue design of offshore steel structures and fatigue assessment of ship structures), fatigue strength assessment of newly added bilge box structures and stringer toe ends closed to draft waterline was carried out using simplified fatigue analysis method combined with spectrum analysis method by SESAM software. The fatigue life of the structures was calculated to provide the reference for the design and construction of cylindrical accommodation platform, which has important significance to practical engineering.更多还原