On the beam and shell modes of buckling of buried pipelines

Yun, Heedo; Kyriakides, Stelios

doi:10.1016/s0267-7261(05)80009-0

Cited by 71 publications

(29 citation statements)

References 29 publications

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“…The problem of plastic buckling of long circular cylinders under axial compression was fully addressed by using an extension of the shell formulation of Yun and Kyriakides (1990). Here we will adopt the same basic formulation, couple it to a cyclic plasticity constitutive model, and use them to analyze the buckling of cylinders under cyclic loads.…”

Section: Formulationmentioning

confidence: 99%

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Ratcheting, wrinkling and collapse of tubes under axial cycling

Jiao

Kyriakides

2009

International Journal of Solids and Structures

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a b s t r a c t Circular tubes compressed into the plastic range first buckle into axisymmetric wrinkling modes. Initially the wrinkle amplitude grows with increasing load. The wrinkles gradually induce a reduction in axial rigidity eventually leading to a limit load instability followed by collapse. The two instabilities can be separated by strain levels of a few percent. This work investigates whether a tube that develops small amplitude wrinkles can be subsequently collapsed by persistent cycling. The problem is first investigated experimentally using SAF 2507 super-duplex steel tubes with D/t of 28.5. The tubes are first compressed to strain levels high enough for mild wrinkles to form; they are then cycled axially under stress control about a compressive mean stress. This type of cycling usually results in material ratcheting or accumulation of compressive strain; here it is accompanied by accumulation of structural damage due to the growth of the amplitude of the initial wrinkles. The tube average strain initially grows nearly linearly with the number of cycles, but as a critical value of wrinkle amplitude is approached, wrinkling localizes, the rate of ratcheting grows exponentially and the tube collapses. The rate of ratcheting and the number of cycles to failure depend on the initial compressive pre-strain and on the amplitude of the stress cycles. However, collapse was found to occur when the accumulated average strain reaches the value at which the tube localizes under monotonic compression. A custom shell model of the tube with initial axisymmetric imperfections, coupled to a cyclic plasticity model, are presented and used to simulate the series of experiments performed successfully. A sensitivity study of the formulation to the imperfections and to key constitutive model parameters is then performed.

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Section: Formulationmentioning

confidence: 99%

“…The new buckling mode tends to lead to its own load maximum and localization as shown in Fig. 3 of (for analytical efforts at the problem see Gellin (1979); Bushnell (1982); Tvergaard (1983a,b); Yun and Kyriakides (1990); ; Kyriakides and Corona (2007)). …”

Section: Introductionmentioning

confidence: 99%

Ratcheting, wrinkling and collapse of tubes under axial cycling

Jiao

Kyriakides

2009

International Journal of Solids and Structures

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“…The results showed that varying values within the above range would affect the pipe response slightly, as reported by Vazouras et al [8] and Yimsiri et al [46]. Therefore, the interface friction angle was regarded as ϕ soil /2 and eventually the interface friction coefficient was set to the value of 0.32 which also complied with Peng [47]. The element types used for soil continuum and pipeline were eight-node reduced integration solid (C3D8R) and four-node reduced integration shell (S4R), with total number of 6240 and 3650 elements, respectively.…”

Section: Numerical Modelingmentioning

confidence: 57%

Response of buried oil and gas pipelines subjected to reverse faulting: A novel centrifuge-finite element approach

2017

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Buried pipelines, transporting fuels, inevitably face active faults when they pass through various seismic regions. These faults may damage the pipelines severely; hence numerous analytical, physical and numerical studies have been conducted with their own pros and cons to investigate the pipeline response due to the faulting. In the present study, an innovative combination of centrifuge and numerical modeling methods has been employed to overcome the geometrical limitation of the small scale physical modeling. Then, it is applied for investigation of buried pipelines response due to reverse faulting. Initially, two centrifuge tests with the fixed end pipelines have been conducted and employed as the benchmarks for the verification of a numerical model. Then, the calibrated numerical model has been used to develop the novel pipeline spring-like end connection system which is supposed to represent the response of the omitted pipeline parts. Eventually, a centrifuge test was conducted, employing the novel end connection system which verified the proper performance of the system. Then, the model is employed for investigation of buried pipelines response due to reverse faulting and the results are also presented.

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“…Yun and Kyriakides (1990) found through analysis of shell buckling that imperfections have a dominant effect over the restraint offered by a stiff medium for the load-carrying capacity for a pipeline subjected to axial loads. Even though the restraint offered by the surrounding stiff medium does not affect the load-carrying capacity, it has a notable effect on the critical strain.…”

Section: Discussion Of Experimental Resultsmentioning

confidence: 99%

“…Hence, the design criterion to contain damage due to rupture and leakage of contents is to limit the compressive strain. Two distinct buckling failure modes (Yun and Kyriakides 1990) have been found to occur for buried pipelines. One failure mode is when the pipeline buckles as an overall beam (Euler-type buckling), and usually this mode would be expected when the pipeline is stocky (low ratio of pipeline radius (R) to wall thickness (t)) and very large axial loads are present.…”

Section: Equipment Designmentioning

confidence: 99%

Uplift of model steel pipelines embedded in polycrystalline ice

Rajani¹,

Morgenstern²

1993

Can. Geotech. J.

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Geotechnical Journal, 30, 3, pp. 441-454, 1993-06 Uplift of model steel pipelines embedded in polycrystalline ice Rajani, B. B.; Morgenstern, N. R. The experimental behaviour of model pipelines embedded in polycrystalline ice is studied to improve the understanding of the behaviour of a chilled buried pipeline subjected to frost heave. Two model pipelines with slightly different radius to thickness ratios were subjected to prescribed displacement rates. Their behaviour was monitored until peak strains corresponding to current acceptable strain limits, often referred to as the wrinkling strains, were exceeded. The sizing of the model pipelines and experimental setup are described and detailed procedures on polycrystalline ice sample preparation are given. Representative core samples of polycrystalline ice were tested to determine its elastic and creep properties. The observed and predicted responses of strain histories in the pipeline are compared and acceptable agreement between the responses is obtained. CanadianKey words: experimental behaviour, embedded model pipelines, polycrystalline ice, frost heave, uplift resistance, critical strain limits.Le comportement expkrimental de pipelines modbles enfouis dans la glace polycristalline est CtudiC de fa~on B amCliorer la comprChension du comportement d'un pipeline froid enfoui subissant un soulkvement dQ au gel. Deux pipelines modbles ayant des rapports rayons sur Cpaisseur legbrement differents ont Ct C soumis a des vitesses de dkplacement donnCes. Leur comportement a Ct C mesurC jusqu'au dkpassement des dkformations de pic correspondant a des limites de dkformation couramment acceptCes, souvent appelCes diformations de plissement Le dimensionnement des pipelines modbles et le montage expCrimental sont dCcrits, et les procCdures dCtaillCes pour la prkparation des Cchantillons de glace polycristalline sont donnCes. Des carottes reprksentatives de glace polycristaline ont Ct C soumises B des essais pour determiner ses propriCtCs Clastiques de m&me que ses propriCtCs de fluage. Les rCactions observCes et prCdites des histoires de contrainte dans le pipeline sont comparCes, et une concordance acceptable entre les rCactions est obtenue.Mots cle's : comportement experimental, pipelines modbles enfouis, glace polycristalline, soulbvement dQ au gel, rCsistance au soulbvement, limites de dCformation critique.[Traduit par la rCdaction]

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On the beam and shell modes of buckling of buried pipelines

Cited by 71 publications

References 29 publications

Ratcheting, wrinkling and collapse of tubes under axial cycling

Ratcheting, wrinkling and collapse of tubes under axial cycling

Response of buried oil and gas pipelines subjected to reverse faulting: A novel centrifuge-finite element approach

Uplift of model steel pipelines embedded in polycrystalline ice

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