June 22, 2025

Updated Free Span Response Near the Seabed

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Vortex-induced vibrations can lead to significant fatigue damage in free spans near the seabed.
In-line vibrations are generally reduced when influenced by the seabed, though cross-flow vibrations initiate at lower velocities.
The cycle counting approach of DNV-RP-F105 was modified to better assess fatigue damage influenced by seabed interactions.
FIST JIP findings indicate that the seabed's presence does not always lessen fatigue damage risks in free spans.

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Analysis reveals vortex-induced vibrations impact fatigue damage in free spans, suggesting seabed proximity may not mitigate risks.

Caruso et al. (2025) studied this question.

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