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Methodology for failure mode prediction of onshore buried steel pipelines subjected to reverse fault rupture
Soil Dynamics and Earthquake Engineering ( IF 4.2 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.soildyn.2020.106116
Vasileios E. Melissianos , Dimitrios Vamvatsikos , Charis J. Gantes

Abstract Oil and gas buried steel pipelines are vulnerable to permanent ground displacements, such as those resulting from tectonic fault activation. The dominant failure mechanism is strongly dependent on the type of faulting. The more complex case is the reverse fault type because the crossing pipeline is significantly compressed and bent and consequently, it may fail due to local buckling, upheaval buckling or tensile weld fracture. Which among those failure modes will be critical, depends on a set of parameters, comprising fault crossing geometry, diameter to thickness ratio (D/t) of the pipeline, pipeline steel grade, and backfill soil properties. An extensive parametric study is carried out, followed by statistical processing of the results in order to formulate simplified statistical models for the prediction of the predominant failure mode according to criteria set by the American Lifelines Alliance and EN 1998-4 standards. The study thus offers the first comprehensive attempt to quantify the qualitative criterion that deeply buried pipes with high D/t ratio tend to buckle locally, while shallowly buried pipes with low D/t ratio tend to buckle globally. Pipe designers may use the provided expressions to predict the predominant failure mode in order to either apply the necessary seismic countermeasures or re-design the pipeline if necessary.

中文翻译:

陆上埋地钢质管道逆断层破裂失效模式预测方法

摘要 石油和天然气埋地钢管道容易受到永久性地面位移的影响,例如由构造断层激活引起的位移。主要的失效机制在很大程度上取决于故障的类型。更复杂的情况是反向故障类型,因为交叉管道被显着压缩和弯曲,因此可能由于局部屈曲、剧变屈曲或拉伸焊缝断裂而失效。这些失效模式中的哪一种是关键,取决于一组参数,包括断层交叉几何形状、管道的直径与厚度比 (D/t)、管线钢等级和回填土特性。进行了广泛的参数研究,然后对结果进行统计处理,以便根据美国生命线联盟和 EN 1998-4 标准设定的标准制定用于预测主要故障模式的简化统计模型。因此,该研究首次全面尝试量化具有高 D/t 比的深埋管道倾向于局部屈曲,而具有低 D/t 比的浅埋管道倾向于整体屈曲的定性标准。管道设计者可以使用提供的表达式来预测主要的失效模式,以便应用必要的抗震措施或在必要时重新设计管道。因此,该研究首次全面尝试量化具有高 D/t 比的深埋管道倾向于局部屈曲,而具有低 D/t 比的浅埋管道倾向于整体屈曲的定性标准。管道设计者可以使用提供的表达式来预测主要的失效模式,以便应用必要的抗震措施或在必要时重新设计管道。因此,该研究首次全面尝试量化具有高 D/t 比的深埋管道倾向于局部屈曲,而具有低 D/t 比的浅埋管道倾向于整体屈曲的定性标准。管道设计者可以使用提供的表达式来预测主要的失效模式,以便应用必要的抗震措施或在必要时重新设计管道。
更新日期:2020-08-01
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