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Analytical and numerical study on lateral buckling of imperfect subsea pipelines with nonlinear lateral pipe-soil interaction model
Ocean Engineering ( IF 5 ) Pub Date : 2020-12-25 , DOI: 10.1016/j.oceaneng.2020.108495
Zhenkui Wang , Yougang Tang , C. Guedes Soares

The nonlinear pipe-soil interaction model and the initial imperfections are predominantly factors that affect the lateral buckling behaviour of subsea pipelines with a high-temperature. In this study, mathematical models, taking these two factors into account, are proposed to simulate lateral buckling of subsea pipelines. Analytical solutions are derived from the assumption of rigid-plastic pipe-soil interaction, while numerical results are obtained when considering nonlinear pipe-soil interaction. The analytical and numerical results have an excellent agreement except for the negligible discrepancy 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. After the analysis of snap-through phenomenon, the influence of breakout resistance, amplitude and half-wavelength of imperfection on the post-buckling behaviour is studied. Finally, the upper and lower bound critical temperature differences are discussed as well. 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 uplifts with increasing breakout resistance or amplitude of imperfection, while it reduces with escalating wavelength of imperfection.



中文翻译:

非线性侧管-土相互作用模型对海底不完全管道横向屈曲的分析与数值研究

非线性的管土相互作用模型和初始缺陷是影响高温海底管道横向屈曲行为的主要因素。在这项研究中,考虑到这两个因素,提出了数学模型来模拟海底管道的横向屈曲。解析解是基于假定的刚性-塑料管-土相互作用的基础上得出的,而当考虑非线性管-土相互作用时可获得数值结果。除了预屈曲状态下的差异可忽略不计外,分析和数值结果具有极好的一致性。这种差异是由刚性-塑性和弹塑性-管-土相互作用模型中动员距离的差异引起的。在分析了击穿现象,抗击穿性的影响后,研究了缺陷的幅度和半波长对屈曲后行为的影响。最后,还讨论了上限和下限临界温差。结果表明,在循环热载荷下,屈曲前和屈曲后状态之间的磁滞循环可能会出现。对于较大的抗击穿性,较小的振幅和较大的缺陷波长,可以更容易地发生卡搭现象和磁滞循环。在屈曲后状态下,最大应力随着抗裂强度或缺陷幅度的增加而升高,而随着缺陷波长的增加而降低。结果表明,在循环热载荷下,屈曲前和屈曲后状态之间的磁滞循环可能会出现。对于较大的抗击穿性,较小的振幅和较大的缺陷波长,可以更容易地发生卡搭现象和磁滞循环。在屈曲后状态下,最大应力随着抗裂强度或缺陷幅度的增加而升高,而随着缺陷波长的增加而降低。结果表明,在循环热载荷下,屈曲前和屈曲后状态之间的磁滞循环可能会出现。对于较大的抗击穿性,较小的振幅和较大的缺陷波长,可以更容易地发生卡搭现象和磁滞循环。在屈曲后状态下,最大应力随着抗裂强度或缺陷幅度的增加而升高,而随着缺陷波长的增加而降低。

更新日期:2020-12-25
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