ABSTRACT
Jack-up platforms operate in three conditions: Transit, Preloading and Operating. Fatigue life of the jack-up platforms in operating condition will be determined as similar as for offshore fixed steel structures. In Preloading condition, the fatigue damages are usually ignored. Up to now, the fatigue damages in transit condition have been calculated approximately by 20% of design life of jack-up platforms, the calculation method is usually accepted by Consultants and Register agencies.The article will present a method to estimate total fatigue life of jack-up leg structures induced by wave loading while considering fatigue damages in operating conditions and transit conditions.
