A semi-analytical approach to a nonlinear stress–strain analysis of buried steel pipelines crossing active faults

Trifonov, O. V.; Cherniy, Vladimir P.

doi:10.1016/j.soildyn.2010.06.002

Cited by 166 publications

(50 citation statements)

References 11 publications

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“…However, elongation of the pipeline due to the upwards or downwards displacement is taken into account here, and thus the corresponding axial pipeline force as a function of the width of the settlement or heave zone is estimated. Albeit this elongation may not be sufficient to mobilize the full friction resistance at the soil-pipeline interface, as assumed in all published methodologies for the stress analysis of pipelines crossing active faults (Newmark and Hall 1975;Kennedy et al 1977;Wang and Yeh 1985;Karamitros et al 2007Karamitros et al , 2011Trifonov and Cherniy 2010), it will be proven here that the axial tensile strains that are developed should not be neglected -at least for cases where the ground surface offset is considerable compared to the diameter of the pipeline. In addition, the formulation for the heave problem will be provided, to prove the postulation that step-like settlement and heave of equal magnitude will result in the same maximum internal forces and strains on the pipeline.…”

Section: Problem Descriptionmentioning

confidence: 90%

“…All analytical methodologies for similar imposed-displacement problems (Newmark and Hall 1975;Kennedy et al 1977;Wang and Yeh 1985;Karamitros et al 2007Karamitros et al , 2011Trifonov and Cherniy 2010) assume, for simplicity, that the ultimate friction force between the pipeline and surrounding soil is fully mobilized when calculating (L). This assumption, however, is not accurate for the problem examined herein.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of buried pipelines subjected to ground surface settlement and heave

2015

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This paper presents an analytical methodology for the calculation of internal forces and strains developing in continuous buried pipelines that cross geotechnically problematic areas and are susceptible to permanent ground surface settlement or heave. Material nonlinearity effects are introduced in the solution via an iterative procedure, while taking into account the effect of pipeline elongation on its response. The use of a versatile bilinear expression to describe the stress-strain response of the pipeline material renders the method appropriate for steel, high-density polyethylene (HDPE), concrete, and cast iron pipelines alike. Comparison of the analytical results against those from benchmark finite element analyses highlights the effectiveness of the simplified analysis. The method is a potential alternative to elaborate three-dimensional nonlinear numerical analyses that are often used in pipeline design practice, and offers ease-of-use with no expense in accuracy, at least for problems involving simple pipeline geometries.Key words: buried pipelines, settlement, heave, reactive soils, ground subsidence.Résumé : Cet article présente une méthode analytique de calcul des forces et contraintes présentes à l'intérieur des pipelines continus enfouis qui traversent des zones géologiques problématiques et peuvent subir les effets des tassements et soulèvements permanents de la surface du sol. Les effets matériels de non-linéarité sont incorporés à la solution par l'intermédiaire d'une procédure itérative et tiennent compte de l'effet de l'élongation du pipeline sur la réponse de ce dernier. L'utilisation d'une expression bilinéaire polyvalente pour décrire la réponse contrainte-déformation du matériau constituant le pipeline rend la méthode appropriée dans le cas des pipelines en acier, en polyéthylène haute densité (PEHD), en béton en fonte. La comparaison des résultats analytiques avec ceux obtenus par la méthode de référence des éléments finis montre l'efficacité de l'analyse simplifiée. La méthode est une alternative possible pour élaborer des analyses numériques non linéaires tridimensionnelles, qui sont souvent mises en pratique lors de la conception des pipelines, et offre une simplicité d'utilisation et une grande précision, du moins dans le cas des problématiques liées aux pipelines à géométrie simple. [Traduit par la Rédaction]

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Section: Problem Descriptionmentioning

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Analysis of buried pipelines subjected to ground surface settlement and heave

2015

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“…Karamitros et al, 2007, 2011, Trifonov & Cherniy, 2010, Kouretzis et al, 2014. A common assumption of these analytical solutions is that the pipeline axis remains straight for a large distance away from the applied PGD zone.…”

Section: Xie Et Al 2011 Vazouras Et Al 2012mentioning

confidence: 99%

Buried pipelines with bends: analytical verification against permanent ground displacements

2016

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Available analytical methodologies for the stress analysis of buried pipelines against large permanent ground displacements (PGDs) apply only to straight pipeline segments. Hence, a new methodology is proposed herein for the analytical computation of pipeline strains in bends of arbitrary angle and radius of curvature, located outside the PGD high-curvature zone, but within the pipeline’s unanchored length. The methodology is based on the equivalent-linear analysis of the bend, assuming that it will perform as an elastic arched beam subjected to uniformly distributed ultimate axial and transverse horizontal soil reactions. The end of the bend towards the PGD zone is subjected to an axial displacement, calculated on the basis of overall displacement compatibility along the pipeline, while the other end is restrained by the unanchored pipeline segment beyond the bend. Using this approach, the maximum axial force at the vicinity of the PGD zone can also be calculated and consequently used for the estimation of corresponding pipeline strains with any of the available numerical or analytical methodologies for straight pipeline segments. Parametric nonlinear finite element analyses are performed to verify the analytical methodology and also derive conclusions of practical interest regarding the effect of bends on pipeline design.

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“…Kennedy et al [4] and Wang et al [5] considered pipe bending with assumptions that pipes deform as curved arcs and elastic beams. In more recent decades, more complicated semi-analytical approaches were proposed by Karamitros et al [6], Trifonov et al [7], and Zhang et al [8], who considered the elastoplastic characteristic of pipe steel's constitutive model and their effects on pipe's nonlinear stress distributions in sections of large deformed pipe segments near fault trace. Although these analytical methods can be more easily popularized in guidelines for engineering applications, they also have severe weaknesses.…”

Section: Introductionmentioning

confidence: 99%

“…Vazouras conducted series of numerical models to investigate the failure behavior of pipeline under strike-slip fault movement in detail [29][30][31][32]. Trifonv et al also built a rigorous numerical model to analyze the influence of the trench on the pipeline performance at fault crossing [7].…”

Section: Introductionmentioning

confidence: 99%

Local Buckling Behavior and Plastic Deformation Capacity of High-Strength Pipe at Strike-Slip Fault Crossing

Liu

Zhang

Wang

et al. 2017

Metals

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Abstract:As a typical hazard threat for buried pipelines, an active fault can induce large plastic deformation in a pipe, leading to rupture failure. The mechanical behavior of high-strength X80 pipeline subjected to strike-slip fault displacements was investigated in detail in the presented study with parametric analysis performed by the finite element model, which simulates pipe and soil constraints on pipe by shell and nonlinear spring elements respectively. Accuracy of the numerical model was validated by previous full-scale experimental results. Insight of local buckling response of high-strength pipe under compressive strike-slip fault was revealed. Effects of the pipe-fault intersection angle, pipe operation pressure, pipe wall thickness, soil parameters and pipe buried depth on critical section axial force in buckled area, critical fault displacement, critical compressive strain and post buckling response were elucidated comprehensively. In addition, feasibility of some common buckling failure criteria (i.e., the CSA Z662 model proposed by Canadian Standard association, the UOA model proposed by University of Alberta and the CRES-GB50470 model proposed by Center of Reliable Energy System) was discussed by comparing with numerical results. This study can be referenced for performance-based design and assessment of buried high-strength pipe in geo-hazard areas.

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A semi-analytical approach to a nonlinear stress–strain analysis of buried steel pipelines crossing active faults

Cited by 166 publications

References 11 publications

Analysis of buried pipelines subjected to ground surface settlement and heave

Analysis of buried pipelines subjected to ground surface settlement and heave

Buried pipelines with bends: analytical verification against permanent ground displacements

Local Buckling Behavior and Plastic Deformation Capacity of High-Strength Pipe at Strike-Slip Fault Crossing

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