Abstract: The module support structure is the connection structure between the topside module and the main deck of FPSO. The design of module support structure should consider the loads such as the weight of the topside module, inertial force and wind load, along with the influence of the overall bending deformation of the hull girder. The fatigue strength of the support structure therefore should be considered at the beginning of the design. This paper conducts the fatigue assessment of the topside module support structure for FPSO. The simplified fatigue assessment method based on the linear fatigue cumulative damage theory is used for the fatigue analysis with consideration of various working conditions during the life cycle of the FPSO in service. In the process, the important data of the fatigue assessment are successfully obtained with the help of the finite element analysis software. The dangerous area of the support structure fatigue damage and the main causes of fatigue are analyzed. The analysis results can be used as references for the detailed node design of the module support structure in the future.

Key words: topside module, support structure, finite element analysis, fatigue assessment

摘要： 模块支墩结构是上部模块与FPSO船体主甲板之间的连接结构,在模块支墩结构设计中除考虑上部模块自重、惯性力及风载等载荷,还应注意船体梁整体弯曲变形的影响,故在设计最初就应考虑支墩结构疲劳强度。该文通过对FPSO上部模块支墩结构的疲劳评估,基于线性疲劳累积损伤原理的简化疲劳评估方法,展开疲劳分析,并考虑了FPSO服役寿命周期内的各种工况,在此过程中借助有限元分析软件成功获得了疲劳评估中的重要数据。分析支墩结构疲劳损坏的危险区域及疲劳产生的主要诱因,分析结果可为后续支墩结构的详细节点设计提供借鉴。

关键词: 浮式生产储油卸油装置, 上部模块, 支墩结构, 有限元分析, 疲劳评估