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Buckling Response of Pipe-in-Pipe Systems Subjected to Bending

机译:管材系统在弯曲作用下的屈曲响应

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摘要

The buckling response of pipe-in-pipe(PIP)systems subjected to bending is investigated in this paper. A set of parameterized models are established to explore the bending characteristics of the PIP systems through eigen-value buckling analysis and nonlinear post-buckling analysis. The results show that the length of PIP systems and the height of centralizers are the most significant factors that influence the buckling moment, ultimate bending mo-ment and buckling mode; the other geometric characteristics, such as initial geometric imperfection and friction between centralizers and outer pipes, evidently influence the post-buckling path and ductility of PIPs; the equivalent bending stiffness is dependent on the length and centralizers. Moreover, the range of equivalent bending stiffness is also discussed.
机译:本文研究了管道在弯曲过程中的屈曲响应。建立了一组参数化模型,以通过特征值屈曲分析和非线性后屈曲分析来探索PIP系统的弯曲特性。结果表明,PIP系统的长度和扶正器的高度是影响屈曲力矩,极限弯矩和屈曲模式的最重要因素。其他几何特征,例如初始几何缺陷和扶正器与外管之间的摩擦,显然会影响PIP的后屈曲路径和延展性;等效弯曲刚度取决于长度和扶正器。此外,还讨论了等效弯曲刚度的范围。

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