Nonlinear behavior analysis of smooth bore unbonded flexible pipes under radial compression

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures Pub Date : 2024-06-27 DOI:10.1016/j.marstruc.2024.103661

Shanghua Wu , Shichao Wang , Qingzhen Lu , Zhixun Yang , Tao Zhang , Yuanchao Yin , Jun Yan

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引用次数: 0

Abstract

Smooth bore unbonded flexible pipes are widely used to transport oil and gas in offshore fields. Due to its main application in shallow water, the radial bearing capacity is usually designed to be low for economic reasons. If the compressive load applied by tensioner equipment is too high during installation, the flexible pipe will fail due to excessive deformation. In this paper, the nonlinear behavior of smooth bore flexible pipes passing through tensioner equipment was investigated numerically and experimentally. A three-dimensional numerical model considering the nonlinear behavior of the materials, layer-to-layer contacts, and friction for flexible pipe radial compression analysis was established. A radial compression test was conducted to verify the accuracy of the numerical model; Then the numerical model was used to analyze the radial compressive behavior of each layer, and its load-bearing capacities and failure mechanisms were investigated. Finally, a parametric study was performed on the opening angle and number of tensioner tracks. The results of this study can provide a useful reference for the installation of smooth bore flexible pipes.

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光滑内孔无粘结柔性管道在径向压缩下的非线性行为分析

光滑内孔无粘结柔性管道广泛用于近海油田的油气输送。由于主要应用于浅水区，出于经济原因，其径向承载能力通常设计得较低。在安装过程中，如果拉伸器设备施加的压缩载荷过大，软管就会因过度变形而失效。本文通过数值和实验研究了通过拉伸器设备的光滑内孔柔性管道的非线性行为。建立了一个三维数值模型，该模型考虑了材料的非线性行为、层与层之间的接触以及摩擦力，用于软管径向压缩分析。为验证数值模型的准确性，进行了径向压缩试验；然后利用数值模型分析了各层的径向压缩行为，并研究了其承载能力和破坏机制。最后，对张拉轨道的开启角度和数量进行了参数化研究。研究结果可为光滑内孔柔性管道的安装提供有益参考。

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来源期刊

Marine Structures 工程技术-工程：海洋

CiteScore

8.70

自引率

7.70%

发文量

157

审稿时长

6.4 months

期刊介绍： This journal aims to provide a medium for presentation and discussion of the latest developments in research, design, fabrication and in-service experience relating to marine structures, i.e., all structures of steel, concrete, light alloy or composite construction having an interface with the sea, including ships, fixed and mobile offshore platforms, submarine and submersibles, pipelines, subsea systems for shallow and deep ocean operations and coastal structures such as piers.