(h) Fatigue analysis: Considering the initial defects defined in (e)
and the stress variations determined in (c), the evolution of
the crack sizes caused by the fatigue process is determined
using adequate tools (i.e., Paris law [13], FormanMettu
equation [14] . . . ). In order to ensure the structural integrity of
the towers, the resulting crack size at the end of their lifespan
should be lower than the critical sizes obtained in step (g).