Comparison of time domain and spectral fatigue analyses of an offshore jacket structure
Proceedings of the International Offshore and Polar Engineering Conference (2016-January): 978-985 (2016)
Contribution to Conference
International Society of Offshore and Polar Engineers (ISOPE)
The results obtained from a computationally excessive full-scale time domain analysis of an offshore jacket structure quantifies the errors resulting from the assumptions and simplifications made in spectral fatigue analysis. These findings also indicate that the simplifications involved lead not only to the well-known inaccuracy but also to a lower fatigue resistance. This paper shows the main causes of the inaccuracies of the spectral fatigue analysis and quantifies them. In addition, this paper verifies the efficacy of an approximation method suggested by Mohammadi et al. (2015) that drastically reduces the computational burden necessary to perform fatigue analyses in time domain.
Fatigue damage approximation
Time domain fatigue