Reliability Analysis for the Fatigue Limit State of the ASTRID Offshore Platform

A reliability analysis with respect to fatigue failure was performed for a concrete gravity platform designed for the Troll field. The reliability analysis was incorporated in the practical design-loop to gain more insight into the complex fatigue problem. In the analysis several parameters relating to wave excitation, structural response and material properties of the concrete were considered as being stochastic. From the work done it is concluded that designing a concrete platform for the Troll field with respect to fatigue is indeed feasible despite the extremely severe boundary conditions and the many uncertainties associated with the fatigue problem. Furthermore it is concluded that introducing the reliability concept in the design stage is both feasible and useful.Structural MechanicsCivil Engineering and Geoscience