LAUSR

Abstract This paper provides a fatigue assessment for a very large floating structure using a spectral-based fracture mechanics approach that combines hydrodynamic response analysis, spectral stress intensity factor calculation, load spectrum, and fatigue crack propagation model. To predict fatigue crack growth in the critical welded joints, this paper summarizes formulas associating equivalent stress intensity factor range with equivalent stress range of a given hot spot. Both are performed using spectral analysis in stochastic sea conditions. The unique curve model is introduced for crack propagation prediction. Thus, this paper provides a reasonable way to convert complex wave loads into crack growth, and can be widely applied to other marine structures.