Randomized trial investigates fatigue damage during offshore pipeline connection, suggesting better installation methods.
During installation and connection of offshore pipelines aboard ships, large stress variations cause significant fatigue damage. Based on the finite element method and taking the displacements of a pipe‐laying ship as moving boundary conditions, an effective theoretical method is developed to investigate the dynamic and fatigue damage behaviors of a large‐diameter offshore pipeline during connection on the pipe‐laying ship. Considering the movement of the touchdown point (TDP), the displacement, stress, and fatigue life of the pipeline are calculated using the present method and compared with OrcaFlex simulations, validating the correctness and accuracy of the theoretical model. Results show that the suspended section and the near‐TDP region experience relatively high stresses and shorter fatigue lives. The uplifting motion is more intense than the sinking motion. Furthermore, the variations of fatigue life and TDP with arc length under different significant wave heights and peak periods of JONSWAP spectrum are analyzed.
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Li et al. (2026) studied this question.
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