A semi‐empirical method for the liquefaction analysis of offshore foundations

Taiebat, Hossein A.; Carter, John

doi:10.1002/1096-9853(200011)24:13<991::aid-nag108>3.0.co;2-5

Cited by 23 publications

(14 citation statements)

References 64 publications

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“…Further details of the semi-analytical method used in this study may be found in Taiebat & Carter (2001). Application of this method to a number of geotechnical problems has shown no adverse effect on the accuracy of the FE solutions (Taiebat, 1999). The FE mesh used in the analyses represents 24 wedgeshaped segments over 360 o in the circumferential direction, each consisting of 698 isoparametric (20 node) brick elements.…”

Section: Finite Element Idealisationmentioning

confidence: 99%

A failure surface for circular footings on cohesive soils

Taiebat¹,

Carter²

2010

Géotechnique

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Cette communication présente les résultats d'analyses aux éléments finis tridimensionnelles de semelles circulaires sous différentes combinaisons de charge vertical, charge horizontale et moment. Le sol est supposé être uniforme et homogène, et se déformer dans des conditions non drainées. Ces études portent également sur les performances des fondations en présence de moments de basculement de grande envergure, et de charges horizontales importantes. Le contact entre le sol et la semelle rigide n'est pas en mesure de supporter la tension ; on prévoit, par conséquent, un dégagement pour le détachement sous l'effet de moments de basculement de grande envergure. Les résultats de ces analyses sont présentés sous forme de point de rupture dans l'espace de charge verticale, horizontale, et du moment. On effectue une comparaison entre les résultats de l'analyse en cours, et on utilise une simple méthode utilisée fréquemment dans le calcul de la force portante des fondations. Il est démontré qu'alors que l'hypothèse d'une largeur effective de la semelle fournit une bonne approximation des effets de l'excentricité de la charge, la méthode conventionnelle, elle, surestime les effets de l'inclinaison de la charge pour les combinaisons de charge avec une composante de cisaillement horizontal de grande envergure. La présente communication introduit un nouveau facteur que l'on peut utiliser pour décrire de façon plus précise les effets de l'inclinaison de la charge, lorsqu'il est utilisé avec la simple méthode de calcul de la force portante.

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Section: Finite Element Idealisationmentioning

confidence: 99%

A failure surface for circular footings on cohesive soils

Taiebat¹,

Carter²

2010

Géotechnique

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“…The ®nite-element formulation used in the analyses is based on the semi-analytical approach (Zienkiewicz & Taylor, 1989) in which the ®eld quantities are approximated by a discrete Fourier representation (Taiebat, 1999). This approach is similar to one described previously by Lai & Booker (1991).…”

Section: Finite-element Modelmentioning

confidence: 99%

Numerical studies of the bearing capacity of shallow foundations on cohesive soil subjected to combined loading

2000

Self Cite

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This paper presents the results of three-dimensional ®niteelement analyses of circular foundations on the surface of homogeneous, purely cohesive soil. The foundations were assumed to adhere fully to the soil, and compressive, tensile and shear stresses may develop at the interface between the footing and the soil. The predicted ultimate response of the foundations to combined vertical, moment and horizontal loading was compared with other available theoretical predictions. A three-dimensional failure locus is presented for these foundations, based on the numerical predictions. An equation that approximates the shape of the failure locus is also suggested, and this provides a convenient means of calculating the bearing capacity of circular foundations on a uniform clay and subjected to combined loading.

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“…Such an observation is classical in undrained laboratory experiments on soil samples (Seed & Lee, 1966;Alarcon-Guzman et al, 1988) or in offshore engineering in general (Rahman et al, 1977;Taiebat & Carter, 2000;Cuéllar et al, 2014). This results from the plastic contractancy of the soil, implying excess PWP in partially drained conditions.…”

Section: Resultsmentioning

confidence: 93%

Numerical modelling of transient cyclic vertical loading of suction caissons in sand

2016

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This paper presents numerical investigations of the monotonic and cyclic behaviours of suction caissons upon vertical transient loading. Both drained and partially drained conditions are investigated. Monotonic compression and traction simulations are carried out to qualitatively compare results with the literature and validate the model. They highlight the different modes of reaction of the caisson to both compression and traction loading. A sensitivity analysis points out the strong influence of some parameters on the resistance of the caisson but also on the failure mechanism. The transient behaviour of the caisson upon different kinds of cyclic load signals is analysed. Results reproduce the settlement and pore water pressure accumulations observed during experiments. The influence of the key design parameters on the settlement accumulation is also assessed. Finally a cyclic diagram is proposed to describe the evolution of the final settlement upon different magnitudes of loading.

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A semi‐empirical method for the liquefaction analysis of offshore foundations

Cited by 23 publications

References 64 publications

A failure surface for circular footings on cohesive soils

A failure surface for circular footings on cohesive soils

Numerical studies of the bearing capacity of shallow foundations on cohesive soil subjected to combined loading

Numerical modelling of transient cyclic vertical loading of suction caissons in sand

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