深水半潜平台关键节点优化研究

Optimization Research on Key Nodes of Deepwater Semi-submersible Platform

半潜式钻井平台作为深水油气开发的主流装备,其内部结构形式及载荷特点极其复杂,特别是典型节点区域存在多处刚度突变设计,在复杂载荷作用下极易发生结构失效,对其进行局部结构优化极为重要.文中针对南海某深水半潜平台立柱与甲板盒的连接区域,在初始模型的基础上提出三种局部结构优化形式,基于水动力频域分析和谱分析的方法得到设计波参数,以计算整体结构响应,通过子模型法系统对比分析不同设计方案的局部强度和疲劳寿命.

As the mainstream equipment for deepwater oil and gas development, semi-submersible drilling platform has extremely complex internal structural form and load characteristics. Especially, there are multiple abrupt stiffness designs in typical joint areas, which are prone to structural failure under complex loads. Therefore, it is extremely important to optimize its local structure. According to the connection area between the column and deck box of a deepwater semi-submersible platform in the south China sea, three local structural optimization forms were proposed based on the initial model. The design wave parameters were obtained based on the hydrodynamic frequency domain analysis and spectral analysis method to calculate the overall structural response. Finally, the local strength and fatigue life of different design schemes were systematically compared and analyzed by the submodel method to achieve better structural design.