A simplified model of upheaval thermal buckling of subsea pipelines

Croll, James

doi:10.1016/s0263-8231(97)00036-0

Cited by 92 publications

(48 citation statements)

References 2 publications

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“…2 is an example of upheaval buckling which has been widely researched in the context of thermally induced buckling of railway tracks [5,6], concrete pavements [7,8] and deep sea pipelines [9][10][11]. Upheaval buckling is most simply explained with reference to Croll's clamped column analogy [6,7,10,11], which is particularly relevant to the design of blinding struts since it makes allowance for the effects of geometric imperfections. According to this approach, the propagation load P p for a buckle of amplitude ' w , relative to its lift off points, and length L p in an infinitely long pipeline can be approximated as:…”

Section: Research Scopementioning

confidence: 99%

“…Croll [11] used equation (1) to derive simplified expressions for the critical buckling load of an infinitely long elastic strut that is draped over a sinusoidal imperfection with amplitude w g and length L g . Croll [11] showed that the buckle propagation load P p corresponding to a specific buckle amplitude w' is determined from equation (1) (2) with L p =L g ).…”

Section: Research Scopementioning

confidence: 99%

“…Croll [11] showed that the buckle propagation load P p corresponding to a specific buckle amplitude w' is determined from equation (1) (2) with L p =L g ). Croll [11] showed that the critical buckling load is less for a strut that is cast onto an imperfection (i.e. unstressed when initially draped over the imperfection) than for an otherwise identical strut that is unstressed when straight.…”

Section: Research Scopementioning

confidence: 99%

“…Geometrical imperfections arise in blinding struts due to initial lack of ground flatness and subsequent ground heave. Croll's analysis [10,11] implies that an imperfection formed by initial lack of ground flatness is more critical for elastic upheaval buckling than a geometrical imperfection of the same size and shape formed by ground heave.…”

Section: Description Of Short-term Loading Testsmentioning

confidence: 99%

See 3 more Smart Citations

Blinding struts — Part 1: Buckling response

Abela

Vollum

Izzuddin

et al. 2011

Engineering Structures

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The term 'blinding' is used to describe the thin layer of unreinforced over-site concrete which is used to protect the base of excavations from construction traffic and to provide a clean surface for the construction of the base slab. Blinding is not generally seen or exploited as a structural element even though it clearly provides some temporary lateral support to the retaining walls of cut-and-cover excavations. This paper shows that enhanced blinding can be used to prop retaining walls in cutand-cover excavations during construction prior to the completion of the base slab.An experimental programme is conducted on ¼ scale specimens, which demonstrates that the failure load of blinding struts is governed by upheaval buckling, and which is employed for the validation of nonlinear finite element models. The main parameters governing the buckling load are shown to include: i) the amplitude of the geometrical imperfection, ii) the thickness of blinding, and iii) the eccentricity of the applied load with respect to the centroid of the strut.

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Section: Research Scopementioning

confidence: 99%

Section: Research Scopementioning

confidence: 99%

Section: Research Scopementioning

confidence: 99%

Section: Description Of Short-term Loading Testsmentioning

confidence: 99%

See 2 more Smart Citations

Blinding struts — Part 1: Buckling response

Abela

Vollum

Izzuddin

et al. 2011

Engineering Structures

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“…The model gives useful insights into the effect of changes in the length and amplitude of the geometric imperfection. The method is an enhancement of Croll's [2,3] clamped column analogy for upheaval buckling which is discussed in the companion paper [1].…”

Section: Introductionmentioning

confidence: 99%

Blinding struts, Part 2: Towards a simplified design method

Vollum

Izzuddin

Abela

et al. 2011

Engineering Structures

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The companion paper described how concrete blinding can be used to prop retaining walls in cut and cover excavations prior to the completion of the base slab.In addition, it was demonstrated that the behaviour of blinding struts can be accurately predicted with nonlinear finite element analysis (NLFEA) if the strut properties and ground profile are known. This paper presents a simple designoriented analytical model which can be used for blinding struts as an alternative to NLFEA. The simplified model is shown to give comparable results to NLFEA and is attractive for design since it allows the effect of variations in imperfection amplitude and length to be rapidly assessed. A case study is presented which illustrates the use of the method and demonstrates that relatively thin blinding struts can resist the maximum axial forces likely to be encountered in cut and cover excavations.

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Problem of large displacements of buried pipelines. Part 2. Stability of straight pipeline under ideally plastic of soil deformation

Оrynyak

Bogdan

2007

Strength Mater

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We developed analytical models of the buckling failure of initially rectilinear pipeline in the environment. We specify the drawbacks of available analytical methods, which take no account of the possible longitudinal displacement of the pipeline points or the limited length of the pipeline portion, as well as, in the limiting case, fail to describe the experimental results of buckling failure in the air. The proposed models make it possible to provide analytical evaluation of the critical load, length and shape of the deformed pipeline in cases of its horizontal and vertical transversal deformations with the account of the above factors. The results obtained are corroborated by the numerical simulation of the deformation process, based on the procedure described by the authors in Part 1, as well as by the full-scale test results.

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A simplified model of upheaval thermal buckling of subsea pipelines

Cited by 92 publications

References 2 publications

Blinding struts — Part 1: Buckling response

Blinding struts — Part 1: Buckling response

Blinding struts, Part 2: Towards a simplified design method

Problem of large displacements of buried pipelines. Part 2. Stability of straight pipeline under ideally plastic of soil deformation

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