| The research bases on the three major sides: stochastic mechanics of engineering, reliability analysis and the design method of reliability. The paper establishes the stochastic element method and the reliability optimal model.The reliability of platform, based on the stochastic element, was calculated. Author considers the uncertaint factors, introduces the stochastic element to calculate the platform reliability, and gains the more exact reliability.This paper presents the optimum reliability assignation method based on the fuzzy factors. The reliability is assigned to the piles, lateral tubes and inclined tubes. The model makes the system reliability optimize. The confirm methods of the significant failure modes and the expecting failure cost of offshore jacket platforms were discussed. According to the diversity of structure reliability index and functional requirement of offshore jacket platform, the models of structural fuzzy optimum design of offshore jacket platforms is established. Therefore, it is necessary to design the jacket platform with reliability optimum mode. |
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