Corrosion and fatigue cracks are major threats to the structural integrity of aging offshore platforms. To rationally estimate the safety levels of the structures, a reliability assessment approach for aging offshore platform with corrosion and fatigue cracks is presented in the paper. The advanced second-order reliability method is adopted to calculate the probability index based on the limit state equation of global failure mode. The base shear capacity is taken as the ultimate strength of the platform. It is modeled as a random process that decreases with time in the presence of corrosion and fatigue crack propagating. And corrosion and fatigue crack growth rates in the main members and key nodes are modeled as random variables. A simulation method of the extreme wave loads that are applied on the structures is proposed too. Finally the reliability index of an example jacket platform is estimated in the case study.

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