Abstract Vulnerability of subsea high pressure/high temperature (HP/HT) pipelines to seismic actions is studied numerically. Unlike most of the existing researches on buried or trenched pipelines, this study is focused on the response of an unburied pipeline with D/t = 20, laid on the seabed and resting on a sleeper. Two different scenarios: (1) earthquake imposed on a laterally buckled pipeline, and (2) earthquake imposed at temperatures lower than the lateral buckling temperature, are studied. The onset of yield and development of compressive local wrinkles in the wall thickness are calculated as the failure modes. Analytical fragility curves are developed based on probability of exceedance of the failure limits for each scenario. It is understood that the pipeline in scenario 1 is more vulnerable to bending-induced damages.

中文翻译：

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用于评估 HP/HT 未埋设海底管道地震脆弱性的分析脆性曲线

摘要 数值研究了海底高压/高温(HP/HT)管道对地震作用的脆弱性。与大多数对埋地或挖沟管道的现有研究不同，本研究侧重于 D/t = 20、铺设在海床上并搁置在枕木上的未埋地管道的响应。研究了两种不同的情况：（1）施加在横向屈曲管道上的地震，和（2）在低于横向屈曲温度的温度下施加的地震。屈服的开始和壁厚局部压缩皱纹的发展被计算为失效模式。分析脆性曲线是根据超出每种情况的故障极限的概率开发的。据了解，场景1中的管道更容易受到弯曲引起的损坏。