深水Spar钻采储运平台极限强度可靠性分析

针对一种新型的深水立柱式Spar钻采储运平台(Spar Drilling Production Storage Offloading)的结构特点进行极限强度可靠性研究。SDPSO平台的中间舱段为储油系统,其结构的安全性尤为重要,本文验证了在波浪弯矩年极值条件下其特殊储油系统结构的安全性。采用SESAM/Wadam软件对SDPSO平台进行水动力计算,利用序列统计法得到年极值短期海况,然后采用极值I型分布得到该短期海况下的波浪弯矩极值；利用ABAQUS非线性有限元软件和改进的Rosenblueth法进行SDPSO平台中舱段的极限强度计算,并得到极限承载能力的概率分布。最后基于一次二阶矩法完成SDPSO平台弯曲极限强度的可靠性计算,结果表明平台结构极限强度具有较高的安全水平,为深海立柱式海洋平台设计提供了依据和参考。

Ultimate strength reliability analysis of deep-water SDPSO platform

For a new deep-water Spar Drilling Storage Offloading (SDPSO) platform, its structural reliability of ultimate strength is analyzed. The safety of oil storage system which is placed at mid-tank is very important, and the article discusses the safety of special oil storage structure in the condition of annual extreme wave bending load. A hydrodynamic analysis is performed to generate load RAOs in SESAM/Wadam software. The study uses time series statistics to gain extreme short term seastate, and extreme wave bending moment is derived by Gumbel I distribution in the short term seastate. Global structural computer model of the SDPSO hull are developed in ABAQUS FE software, and the probability distribution of ultimate strength is calculated by the Rosenblueth Method. The First Order Second Moment Method is applied in the calculation of reliability. Computed failure probability is lower than target value, which indicates the SDPSO structure possesses with high structural reliability level. The results provide a useful theory basis and technology reference for the design of deep-water platform.