Wang, ZK., Tang, YG. and Guedes Soares, C. (2021), “Analytical and numerical study on lateral buckling of imperfect subsea pipelines with nonlinear lateral pipe-soil interaction model”, Ocean Engineering, Vol. 221, 108495 (14 pages)

The nonlinear pipe-soil interaction model and the initial imperfections are key factors that affect lateral buckling behaviour of subsea pipelines under high-temperature conditions. In this study, mathematical models, taking these key factors into account, are proposed to simulate lateral buckling of subsea pipelines. Analytical solutions are derived with the assumption of rigid-plastic pipe-soil interaction, while numerical results are obtained considering elastic-plastic or nonlinear pipe-soil interaction. The analytical and numerical results have an excellent agreement except that a small discrepancy exists in the pre-buckling state. The discrepancy is induced by the difference of mobilisation distance in rigid-plastic and elastic-plastic pipe-soil interaction models. The snap-through phenomenon is analysed. Finally, the influence of breakout resistance, amplitude and half-wavelength of imperfection on the post-buckling behaviour is analysed, and the upper and lower bound critical temperature differences are discussed. The results show that the hysteresis cycle between pre-buckling and post-buckling states may appear under cyclic thermal loading. The snap-through phenomenon and the hysteresis cycle can take place more easily for large breakout resistance, small amplitude and large wavelength of imperfection. In the post-buckling state, the maximum stress increases with increasing breakout resistance or amplitude of imperfection, while it decreases with increasing wavelength of imperfection.

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