Abstract Lifeline engineering plays an important role in the development of human society and economy. A large number of seismic damage events show that the buried polyethylene pipeline is easy to be damaged under the earthquake action, however, the research on the seismic vulnerability of the buried polyethylene pipeline is still lacking. In this paper, the seismic vulnerability of buried polyethylene pipeline is studied based on the finite element method (FEM). The FE model and vulnerability analysis model are established. The establishment of the FE model mainly considers different site categories, soils damping that calculated by the Rayleigh damping theory and the wave pattern and input mode of seismic wave. At the same time, the grid sensitivity analysis and model verification are carried out. The vulnerability model includes the seismic demand model and the seismic capacity model. Based on the previous research, the damage state of the polyethylene pipeline is defined, and the sample combination of pipeline and seismic wave is considered to calculate the vulnerability curve of the pipeline. In all, this study provides a useful idea for the rapid evaluation of the seismic performance of buried polyethylene pipes.

中文翻译：

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基于有限元法的埋地聚乙烯管道抗震易损性分析

摘要 生命线工程在人类社会和经济发展中发挥着重要作用。大量的地震破坏事件表明，埋地聚乙烯管道在地震作用下很容易发生破坏，但对埋地聚乙烯管道的地震易损性的研究还很缺乏。本文基于有限元法(FEM)对埋地聚乙烯管道的地震易损性进行了研究。建立有限元模型和脆弱性分析模型。有限元模型的建立主要考虑不同场地类别、瑞利阻尼理论计算的土壤阻尼以及地震波的波型和输入模式。同时进行了网格敏感性分析和模型验证。脆弱性模型包括抗震需求模型和抗震能力模型。在前人研究的基础上，定义了聚乙烯管道的破坏状态，并考虑管道与地震波的样本组合计算管道的易损性曲线。总之，本研究为快速评价埋地聚乙烯管道的抗震性能提供了有益的思路。