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中文摘要：
疲劳破坏是海洋工程结构的一种主要破坏形式。对于渤海有冰边际油田，需要在满足冰激疲劳要求的同时考虑平台成本。该文建立了抗冰导管架疲劳可靠性优化模型，利用虚拟激励法并结合兼顾整体和局部的混合有限元模型，实现了复杂管节点冰激疲劳的快速高效分析，并利用对数正态格式计算冰激节点疲劳可靠性。渤海JZ20-2NW平台算例分析表明，通过优化设计可以在满足节点疲劳可靠性要求的同时降低结构重量，可以为冰区海洋平台设计提供参考。
英文摘要：
Fatigue is one of the chief damage patterns in ocean engineering. As for the marginal fields of the Bohai Gulf, the design needs to satisfy the requirements of ice-induced fatigue in view of the cost. This paper developed a method to optimize the design of ice-resistant jacket platform based on fatigue reliability. The pseudo excitation method was employed to achieve the efficient ice-induced fatigue analysis for complex tubular joints based on a mixed finite element model that can handle the global and local structural characteristics simultaneously, and then the lognormal format was used to assess the ice-induced fatigue reliability of tubular joints. Finally, a real platform JZ20-2 NW platform was used as a demonstration, and the results showed that the design optimization can provide a lighter structure satisfying the requirement of fatigue reliability, and is useful for economic ice-resistant jacket platform design.
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