Perpustakaan Digital ITB

This study presents a comparative analysis of spectral and deterministic fatigue analysis methods for fixed offshore structures, specifically fixed jacket platforms. The research evaluates the accuracy of individual wave probability derived from Longuet-Higgins' joint probability conversion theory and its impact on fatigue life predictions. Three structural models with varying dynamic characteristics were analyzed using irregular wave scatter data to simulate real sea conditions. The findings indicate that static deterministic fatigue analysis results in higher cumulative damage estimates compared to dynamic deterministic fatigue analysis, while dynamic stress analysis aligns closely with spectral fatigue results. This research highlights the significance of accurate wave probability assessments in fatigue analysis and provides insights for improving design strategies in offshore engineering.