OPTIMIZATION OF ICE-RESISTANT JACKET PLATFORM DESIGN BASED ON FATIGUE RELIABILITY

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.