Prediction of the upheaval buckling critical force for imperfect submarine pipelines

Xin-hu, Zhang; Duan, Menglan

doi:10.1016/j.oceaneng.2015.09.022

Cited by 53 publications

(18 citation statements)

References 29 publications

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“…Experimental and numerical investigations were carried out to investigate the buckle interaction between propagation buckling and upheaval or lateral buckling in subsea pipelines by Albermani and Karampour [27,28]. Moreover, many finite-element analyses have been performed to investigate lateral and upheaval buckling [29][30][31][32][33][34][35]. All these methods are employed to investigate lateral buckling or vertical buckling behaviour rather than how to control them.…”

Section: Introductionmentioning

confidence: 99%

Analytical study of lateral thermal buckling for subsea pipelines with sleeper

Wang

Tang

Heijden

2018

Thin-Walled Structures

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Unburied subsea pipelines operating under high-temperature and high-pressure conditions tend to relieve their axial compressive force by forming lateral buckles. Uncontrolled lateral buckling may lead to pipeline failure. In order to control lateral buckling, a sleeper is often employed as a buckle-initiation technique. In this study, analytical solutions of lateral buckling for unburied subsea pipelines with sleeper are derived. An energy analysis is employed to investigate the stability of the buckled pipeline. The influence of sleeper height and sleeper friction on pipeline buckled configurations and typical lateral buckling behaviour is illustrated and analysed. The results are shown to be in very good agreement with experimental data in the literature. We also discuss the effect of imperfections and conduct an error analysis of one of the main assumptions of the proposed analytical method. Our results show that increasing the height of the sleeper or decreasing the friction between pipeline and sleeper can all be used to decrease the minimum critical temperature difference. However, only the sleeper height is effective in substantially reducing the maximum compressive stress.

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Section: Introductionmentioning

confidence: 99%

Analytical study of lateral thermal buckling for subsea pipelines with sleeper

Wang

Tang

Heijden

2018

Thin-Walled Structures

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“…Zhu [23] and Wang [24] proposed a new approach for determining the lateral buckling behaviour of pipelines under thermal loading without the assumption of lateral configuration. In addition, many finite-element analyses have been performed to investigate lateral and upheaval buckling [25][26][27][28][29]. All these studies focussed on lateral buckling or vertical buckling behaviour rather than on how to control this behaviour.…”

Section: Introductionmentioning

confidence: 99%

Analytical study of distributed buoyancy sections to control lateral thermal buckling of subsea pipelines

2018

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Unburied subsea pipelines operating under high temperature and high pressure (HT/HP) conditions tend to relieve their axial compressive force by forming lateral buckles in an uncontrolled manner. In order to control lateral buckling, a distributed buoyancy section is often employed. In this study, analytical solutions are deduced for lateral buckling of unburied subsea pipelines with a distributed buoyancy section. An energy analysis is employed to investigate the stability of the buckled pipeline. The influence of the length and weight of the distributed buoyancy section on pipeline buckled configurations, typical lateral buckling behaviour and the minimum critical temperature difference is illustrated and analysed. The results are shown to be in good agreement with experimental data in the literature. The effect of imperfections is also discussed and an error analysis is conducted for one of the main assumptions of the proposed analytical method. The results show that increasing the length or decreasing the weight of the distributed buoyancy section can both be used to decrease the minimum critical temperature difference. The maximum compressive stress will decrease with decreasing weight of the distributed buoyancy section. However, the influence of the length of the distributed buoyancy section on the maximum compressive stress is complicated.

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“…Upheaval buckling of unburied subsea pipelines and pipe-in-pipe systems was studied by Wang et al through finite-element modelling [29,30]. Finite-element modelling was employed to investigate the critical upheaval buckling force of buried subsea pipelines [31][32][33] and post-buckling beahviour of unburied subsea pipelines and pipe-in-pipe systems [29,30]. The nonlinear soil resistance model is proposed based on laboratory tests, which is also incorporated in finite element analysis of buried pipelines with different amplitudes of initial geometric imperfections [34].…”

Section: Introductionmentioning

confidence: 99%

Localised upheaval buckling of buried subsea pipelines

2018

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Buried subsea pipelines under high temperature conditions tend to relieve their axial compressive force by forming localised upheaval buckles. This phenomenon is traditionally studied as a kind of imperfect column buckling problem. We study upheaval buckling as a genuinely localised buckling phenomenon without making any ad hoc assumptions on the shape of the buckled pipeline. We combine this buckling analysis with a detailed state-of-the-art nonlinear pipe-soil interaction model that accounts for the effect of uplift peak soil resistance for buried pipelines. This allows us to investigate the effect of cover depth of subsea pipelines on their load-deflection behaviour. Furthermore, the influence of axial and uplift peak soil resistance on the localised upheaval behaviour is investigated and the maximum axial compressive stress during the buckling process is discussed. Parameter studies reveal a limit to the temperature difference for safe operation of the pipeline. Localised upheaval buckling may then occur if the pipe is sufficiently imperfect or sufficiently dynamically perturbed.

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Prediction of the upheaval buckling critical force for imperfect submarine pipelines

Cited by 53 publications

References 29 publications

Analytical study of lateral thermal buckling for subsea pipelines with sleeper

Analytical study of lateral thermal buckling for subsea pipelines with sleeper

Analytical study of distributed buoyancy sections to control lateral thermal buckling of subsea pipelines

Localised upheaval buckling of buried subsea pipelines

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