There is an increasing number of LNG ships and oil tankers that are intended for navigation in ice. There is a necessity to assess the risk of fatigue damage during the ice navigation phase in these ships. This paper summarizes the preliminary results of an investigation on the fatigue of ship hull structures when navigating in ice and discusses some of the associated issues. The ice loads are determined for different winter conditions and ice thicknesses, based on ship routes and operational profiles. Using the ice load distributions and structural responses to the loads, the fatigue damage is estimated. The data for the study is taken from full-scale measurements. The results can be used for establishing if measures need to be taken to reduce the risk of fatigue damage in the structural elements of ship hulls.

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