The Effect of Transfer Function on Fatigue Life Determination in Spectral Fatigue Analysis

Fatigue life estimation is essential in the design phase and reassessment of structural strength. One fatigue analysis method is the spectral analysis which uses a wave spectrum in the frequency domain. This study conducted a spectral analysis on a three legs jacket structure with different transfer functions in determining fatigue life. API RP-2A recommends performing frequency selection from the wave data transfer function. The result of this study is that the fatigue life value from selecting the API RP-2A frequency is more conservative than the wave data transfer function. In the analysis process, the API RP-2A method is more efficient in terms of time and data storage.