Abstract Buried composite pipelines crossing active faults can be deformed significantly due to strike-slip fault movement. Because of the problem complexity arising from material mechanical behavior and imposed large deformation, a numerical analysis was conducted using a nonlinear finite element approach. The lateral displacement incrementally was imposed normal to the pipe axis until one of the pipe layers failed based on the Hashin failure criteria. The effective factors on the buried composite pipeline performance, such as the pipe dimensions, composite lay-up, and soil stiffness, were studied parametrically. The results showed that the winding angle of the composite pipe has significant effects on the response of the pipe subjected to the fault movement, therefore determining an optimum winding angle is very important for practical engineering designs. In addition, the results show that the effect of changing the pipe diameter cannot be predicted easily, and also it is depended on the winding angle. However, changing the soil stiffness did not change the optimum winding angle. Furthermore, the comparison conducted for the studied composite and steel pipes at the similar simulation conditions showed that the composite pipe has a better response until the onset of the failure, and the composite pipe could be considered as a suitable replacement for the conventional buried steel pipeline.

中文翻译：

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走滑断层运动作用下埋地复合管道的力学行为

摘要 穿越活动断层的埋地复合管道会因走滑断层运动而发生明显变形。由于材料力学行为引起的问题复杂性和施加的大变形，使用非线性有限元方法进行数值分析。根据 Hashin 破坏准则，垂直于管道轴线逐渐施加横向位移，直到其中一个管道层发生破坏。对影响埋地复合管道性能的影响因素，如管道尺寸、复合铺设和土壤刚度，进行了参数化研究。结果表明，复合管的缠绕角度对管道在断层运动下的响应有显着影响，因此，确定最佳缠绕角度对于实际工程设计非常重要。此外，结果表明，改变管径的影响不容易预测，而且还取决于缠绕角度。然而，改变土壤刚度并没有改变最佳缠绕角度。此外，在相似的模拟条件下对所研究的复合管和钢管进行的比较表明，复合管在失效发生前具有更好的响应，可以认为复合管是传统埋地钢管的合适替代品。 . 改变土壤刚度并没有改变最佳缠绕角度。此外，在相似的模拟条件下对所研究的复合管和钢管进行的比较表明，复合管在失效开始前具有更好的响应，可以认为复合管是传统埋地钢管的合适替代品。 . 改变土壤刚度并没有改变最佳缠绕角度。此外，在相似的模拟条件下对所研究的复合管和钢管进行的比较表明，复合管在失效开始前具有更好的响应，可以认为复合管是传统埋地钢管的合适替代品。 .