Rational methods for fatigue design and inspection planning of offshore structures

Abstract This paper reviews the current usage of probabilistic fracture mechanics in fatigue assessment of offshore structures and summarizes practical usage of probabilistic load and response analysis models used in conjunction with fracture mechanics models. These models are then used in conjunction with probabilistic models for inspection methods used in the offshore and marine industries to assess the probability of failure, derive optimum inspection plans and derive optimum design considering cost of design, cost of inspection, cost of repair and consequential costs of failure. Comments are made on the status of such reliability based optimization techniques in design and on the need for further work. Some examples of use are demonstrated.

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