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Numerical research on the lateral global buckling characteristics of a high temperature and pressure pipeline with two initial imperfections

机译：具有两个初始缺陷的高温高压管道横向整体屈曲特性的数值研究

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摘要

With the exploitation of offshore oil and gas gradually moving to deep water, higher temperature differences and pressure differences are applied to the pipeline system, making the global buckling of the pipeline more serious. For unburied deep-water pipelines, the lateral buckling is the major buckling form. The initial imperfections widely exist in the pipeline system due to manufacture defects or the influence of uneven seabed, and the distribution and geometry features of initial imperfections are random. They can be divided into two kinds based on shape: single-arch imperfections and double-arch imperfections. This paper analyzed the global buckling process of a pipeline with 2 initial imperfections by using a numerical simulation method and revealed how the ratio of the initial imperfection’s space length to the imperfection’s wavelength and the combination of imperfections affects the buckling process. The results show that a pipeline with 2 initial imperfections may suffer the superposition of global buckling. The growth ratios of buckling displacement, axial force and bending moment in the superposition zone are several times larger than no buckling superposition pipeline. The ratio of the initial imperfection’s space length to the imperfection’s wavelength decides whether a pipeline suffers buckling superposition. The potential failure point of pipeline exhibiting buckling superposition is as same as the no buckling superposition pipeline, but the failure risk of pipeline exhibiting buckling superposition is much higher. The shape and direction of two nearby imperfections also affects the failure risk of pipeline exhibiting global buckling superposition. The failure risk of pipeline with two double-arch imperfections is higher than pipeline with two single-arch imperfections.
机译：随着海上油气开采逐渐向深水转移，对管道系统施加了更高的温差和压力差，使得管道的整体屈曲更加严重。对于未埋的深水管道，横向屈曲是主要的​​屈曲形式。由于制造缺陷或海床不平整的影响，管道系统中普遍存在初始缺陷，初始缺陷的分布和几何特征是随机的。根据形状，它们可分为两种：单拱形缺陷和双拱形缺陷。本文使用数值模拟方法分析了具有2个初始缺陷的管道的整体屈曲过程，并揭示了初始缺陷的空间长度与缺陷的波长之比以及缺陷的组合如何影响屈曲过程。结果表明，具有两个初始缺陷的管道可能会遭受整体屈曲的叠加。叠加区屈曲位移，轴向力和弯矩的增长率比无屈曲叠加管道大几倍。初始缺陷的空间长度与缺陷的波长的比值决定了管道是否遭受屈曲叠加。表现出屈曲的管道的潜在失效点与无屈曲的管道的潜在失效点相同，但是表现出屈曲的管道的失效风险要高得多。两个附近瑕疵的形状和方向也影响表现出整体屈曲叠加的管道的失效风险。具有两个双拱缺陷的管道的失效风险要高于具有两个单拱缺陷的管道的失效风险。

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    Wenbin Liu; Aimin Liu;

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  • 年(卷),期 -1(13),3
  • 年度 -1
  • 页码 e0194426
  • 总页数 16
  • 原文格式 PDF
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