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Publications
Wang, ZK. and Guedes Soares, C. (2022), “A new buckle initiation concept based on the energy barrier of subsea pipelines laid on a sloping seabed”, Marine Structures, Vol. 82, 103155.
Lateral buckling may occur for subsea pipelines operating under high-temperature conditions and buckle initiation techniques are usually employed to trigger man-made buckles at pre-designed locations to avoid rogue buckles. Based on the energy barrier, a new buckle initiation concept is proposed to trigger lateral buckling for subsea pipelines laying on a sloping seabed. The corresponding mathematical model is formulated, which can also be applied to the case of a horizontal seabed by setting the sloping angle to be zero. The energy difference between pre- and post-buckling states is evaluated to determine the Maxwell temperature and the energy barrier. The influence of the sloping angle on the lateral and axial deformations and typical post-buckling behaviour is analysed. The results show that the downward buckling mode prefers to occur since the minimum critical temperature, the Maxwell temperature and the energy barrier are all lower than that for upward buckling mode. In the downward buckling mode, both the maximum displacement and the maximum stress are located at the central lobe. However, they may locate at the side lobes in the upward buckling mode when the sloping angle is large enough.
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