Variation of Stress Range Due to Variation in Sea States – An Overview of Simplified Method of Fatigue Analysis of Fixed Jacket Offshore Structure

摘要

In this paper the simplified method of fatigue analysis of fixed offshore structure was considered. For the purpose of this study, the model was analyzed using ANSYS, and by progressively stepping the regular wave through the structure, a range of stress, S, was identified for each critical point on the structure as the nominal stress range, which was then multiplied by SCF of 1.07 to obtain the actual stress range for six different sea states for time intervals, t = 0, T/4, T/2, 3T/4 and T.