Exact and simplified estimations for elastic buckling pressures of structural pipe-in-pipe cross sections under external hydrostatic pressure
Exact and simplified estimations for elastic buckling pressures of structural pipe-in-pipe cross sections under external hydrostatic pressure
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DOI：
10.1007/s00773-007-0244-y
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发表时间：
2007-11
影响因子：
2.6
通讯作者：
Motohiro Sato;Minoo H. Patel
中科院分区：
文献类型：
--
作者：
Motohiro Sato;Minoo H. Patel
结构管中管截面在海上油气生产系统中具有巨大的应用潜力，因为它将保温性能与结构强度和自重相结合。这样的横截面包括内部和外部薄壁管，它们之间的环空由可选择的填充材料完全填充，以赋予性能的适当组合。结构管中管截面可以表现出几种不同的坍塌机制，其中一种坍塌机制优先发生的基础是令人感兴趣的。本文对外静水压力作用下结构管中管截面的弹性屈曲行为进行了精确的预测分析。本文还研究了将外管及其与填料的接触视为弹性基础上的管道时的弹性屈曲压力和模态的简化近似。结果表明，弹性屈曲压力随填料与管材的相对弹性模量、填料厚度、内外管材厚度的变化规律。基于实际应用场景的实例研究表明，简化近似对于实际结构设计目的是足够精确的。
Structural pipe-in-pipe cross sections have significant potential for application in offshore oil and gas production systems because they combine thermal insulation performance with structural strength and self weight in an integrated way. Such cross sections comprise inner and outer thin-walled pipes with the annulus between them fully filled by a selectable filler material to impart an appropriate combination of properties. Structural pipe-in-pipe cross sections can exhibit several different collapse mechanisms, and the basis of the preferential occurrence of one over the others is of interest. This article presents an exact analysis for predicting the elastic buckling behaviours of a structural pipe-in-pipe cross section when subjected to external hydrostatic pressure. Simplified approximations are also investigated for elastic buckling pressure and mode when the outer pipe and its contact with the filler material is considered as a pipe on an elastic foundation. Results are presented to show the variation of elastic buckling pressure with the relative elastic modulus of the filler and pipe materials, the filler thickness, and the thicknesses of the inner and outer pipes. Case studies based on realistic application scenarios are used to show that the simplified approximations are sufficiently accurate for practical structural design purposes.