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深水海底管道整体式止屈器屈曲动态传播及止屈研究

ISSN号：1003-2029
期刊名称：海洋技术
时间：2013.2.2
页码：60-65
分类：U66[交通运输工程—船舶及航道工程;交通运输工程—船舶与海洋工程]
作者机构：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072
相关基金：国家自然科学基金资助项目（51239008）;国家自然科学基金创新研究群体科学基金（51021004）;国家自然科学基金资助项目（51179126）; 国家科技重大专项资助项目（2011ZX05026-005）; 上海交通大学海洋工程国家重点实验室研究基金资助项目
相关项目：重大水利工程安全性的基础理论研究

关键词：屈曲传播, 动态传播, 止屈器, propagating buckles, dynamic propagation, buckle arrestors

中文摘要：

目前,几乎所有关于海底管道屈曲传播和止屈器的研究都是基于准静态的情况下进行的,文中对在更加真实的动态恒定载荷下海底管道屈曲传播和整体式止屈器的止屈效果进行评估。通过非线性有限元分析软件ABAQUS建立整体式止屈器的准静态和动态模型,基于有限元变形运动学,对管道屈曲压溃后的接触问题进行适当设定。有限元模型较精确地模拟了管道屈曲的稳定传播和止屈,结果观察到了整体式止屈器的动态加强现象,通过有限元数值模拟与美国的动态试验结果对比分析数据。此外,通过研究速度与压力关系,发现管道屈曲剖面减短和屈曲前方管道反向椭圆度随压力变化的规律,分析了止屈器动态加强的机理。研究表明,目前整体式止屈器的准静态设计过于保守,今后设计时应考虑更为实际的动态环境载荷。

英文摘要：

Based on experiments and analyses in which buckles propagated and engaged the arrestors quasi-statically, the performances of propagating buckle and integral buckle arrestors in pipelines were reevaluated under the more realistic dynamic buckle propagation conditions encountered in the sea. The models for simulating the quasi-static and dynamic propagation and arrest of buckles in pipelines were presented, which were developed within the framework of the nonlinear finite element ABAQUS. Based on finite deformation kinematics, the contact developed in the collapsed tube behind the propagating buckle was properly treated. The dynamic model was shown to reproduce accurately the conditions of steady-state buckle propagation as well as the dynamic engagement of a buckle with an arrestor. For all cases considered, the dynamic enhancement of arrestor performance was observed as in the experiments. For buckle velocities of interes4 the buckle profile was found to have sharpened considerably compared to the quasi-static one, which cause significant reverse ovality in the tube in front of the buckle and in the downstream tube. Based on the result of this study, it is concluded that quasi-static design procedures for integral buckle arrestors proposed previously are conservative.

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