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Rozprawy doktorskie na temat „Offshore structures – Foundations”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 21 lutego 2023

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1

El-Gharbawy, Sherif Lotfy. "The pullout capacity of suction caisson foundations /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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Cotter, Oliver. "Installation of suction caisson foundations for offshore renewable energy structures." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.534163.

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Santa, Maria Paulo Eduardo Lima de. "Behaviour of footings for offshore structures under combined loads." Thesis, University of Oxford, 1988. http://ora.ox.ac.uk/objects/uuid:50fb3d35-90b3-4685-9ace-0ec5a50014df.

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The lack of knowledge about the behaviour of footings for jack-up rigs under storm loads poses a design problem which can be tackled by model testing. The areas of prime concern are the ultimate loads on footings under combined loading, which affects the safety of the rig, and the rotational stiffness, which affects the interaction between the foundation and the structure. A programme of loading tests was performed on model footings on clay, and was divided into two stages: monotonic loading and cyclic loading. The clay samples were obtained by consolidating Speswhite kaolin slurry in cylindri

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Kirkwood, Peter Brian. "Cyclic lateral loading of monopile foundations in sand." Thesis, University of Cambridge, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709540.

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Islam, Mohammed Kabirul. "Constitutive models for carbonate sand and their application to footing problems." Phd thesis, Department of Civil Engineering, 1999. http://hdl.handle.net/2123/6428.

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Cassidy, Mark Jason. "Non-linear analysis of jack-up structures subjected to random waves." Thesis, University of Oxford, 1999. http://ora.ox.ac.uk/objects/uuid:02b96107-638b-4200-9fd7-fa49635594e3.

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There is a steadily increasing demand for the use of jack-up units in deeper water and harsher environments. Confidence in their use in these environments requires jack-up analysis techniques to reflect accurately the physical processes occurring. This thesis is concerned with the models appropriate for the dynamic assessment of jack-ups, an important issue in long-term reliability considerations. The motivation is to achieve a balanced approach in considering the non-linearities in the structure, foundations and wave loading. A work hardening plasticity model is outlined for the combined vert

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Jardine, Richard. "Investigations of pile-soil behaviour, with special reference to the foundations of offshore structures." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/8519.

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8

Senders, Marc. "Suction caissons in sand as tripod foundations for offshore wind turbines." University of Western Australia. School of Civil and Resource Engineering, 2009. http://theses.library.uwa.edu.au/adt-WU2009.0163.

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[Truncated abstract] The demand for offshore wind turbines is increasing in densely populated areas, such as Europe. These constructions are typically founded on a gravity foundation or a large 'mono pile'. Gravity foundations can only be used at locations where strong soils exist and water depths are limited. Costs associated with a 'mono pile' type foundation contribute to a very large percentage of the total investment costs. This research, therefore, focuses upon a different foundation for offshore wind turbines, namely suction caissons beneath a tripod. This foundation can be used in all

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9

Gütz, Patrick Sven [Verfasser], and Martin [Akademischer Betreuer] Achmus. "Tensile-loaded suction bucket foundations for offshore structures in sand / Patrick Sven Gütz ; Betreuer: Martin Achmus." Hannover : Gottfried Wilhelm Leibniz Universität Hannover, 2020. http://d-nb.info/122126947X/34.

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Pinna, Rodney. "Buckling of suction caissons during installation." University of Western Australia. School of Civil Engineering, 2003. http://theses.library.uwa.edu.au/adt-WU2004.0008.

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Suction caissons are a foundation system for offshore structures which offer a number of advantages over traditional piled foundations. In particular, due to the method of installation used, they are well suited for deep-water applications. The suction caisson consists of an open ended cylindrical shell, which is installed below the seabed in a sequence which consists of two loading phases. The caisson is first installed part way under self weight, with the installation being completed by lowering the pressure within the cylinder and thus allowing the ambient water pressure to force the caisso

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11

Zhou, Hongjie. "Numerical study of geotechnical penetration problems for offshore applications." University of Western Australia. Centre for Offshore Foundation Systems, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0239.

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The research carried out in this thesis has concentrated on the application of numerical solutions to geotechnical penetration problems in offshore engineering. Several important issues closely relevant to deep-water oil and gas developments were investigated, covering installation of suction caisson foundations, interpretation of fullflow penetrometers and shallow penetration of a cylindrical object (submarine pipeline or T-bar), all in clayey sediments such as are often encountered in deep-water sites. These problems are commonly characterised by large vertical movements of structural elemen

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Stracke, Fernanda. "Fluidização de solo arenoso associada à injeção de agente cimentante para ancoragem de estruturas offshore." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/60645.

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A instalação de estruturas offshore em grandes profundidades demanda avanços na área da Engenharia, principalmente quanto ao desenvolvimento de novas tecnologias associadas à ancoragem destas estruturas. O objetivo deste trabalho é analisar os mecanismos e conceitos associados à fluidização de solos arenosos com jatos de água, associando a técnica ao melhoramento do solo com agente cimentante, com a finalidade de futuramente aplicar estas técnicas em campo, na instalação e fixação de fundações e âncoras para plataformas e estruturas offshore. O trabalho é fundamentado nas pesquisas de Niven (1

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13

Jin, Zhuang. "Numerical investigation of caisson foundations in sand under combined monotonic loadings for offshore wind turbines." Thesis, Ecole centrale de Nantes, 2019. http://www.theses.fr/2019ECDN0002/document.

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Cette thèse de doctorat porte sur la réponse des fondations caisson dans du sable pour les éoliennes en mer soumises à des chargements monotones et cycliques combinés. Le processus de défaillance et l’enveloppe de rupture (diagramme de capacité portante) d’une fondation en caisson dans du sable soumise à des chargements monotones combinés sont premièrement étudiés à l’aide du modèle constitutif de Mohr-Coulomb. La méthode Lagrangian-Smoothed Particle Hydrodynamics Combinée (CLSPH) est adoptée pour prendre en compte les grandes déformations et les limites de l'approche sont mises en évidence. U

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14

El, Haffar Ismat. "Physical modeling and study of the behavior of deep foundations of offshore wind turbines in sand." Thesis, Ecole centrale de Nantes, 2018. http://www.theses.fr/2018ECDN0021/document.

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La capacité axiale et latérale des pieux foncés dans du sable de Fontainebleau NE34 ont été étudié à l’aide d’essais sur modèles réduits centrifugés. L’effet de la méthode d’installation, de la densité et de la saturation du sable, du diamètre du pieu, de la géométrie de sa pointe (ouvert /fermé) et de sa rugosité sur la capacité axiale a été étudié. Une augmentation significative de la capacité en traction est observée dans les pieux foncés cycliquement, contrairement aux pieux foncés d’une manière monotone à 100 × g. La saturation du sable dense accélère la formation du bouchon lors de l'ins

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15

Tedesco, Giacomo. ""Offshore tower or platform foundations: numerical analysis of a laterally loaded single pile or pile group in soft clay and analysis of actions on a jacket structure"." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/6802/.

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Laterally loaded piles are a typical situation for a large number of cases in which deep foundations are used. Dissertation herein reported, is a focus upon the numerical simulation of laterally loaded piles. In the first chapter the best model settings are largely discussed, so a clear idea about the effects of interface adoption, model dimension, refinement cluster and mesh coarseness is reached. At a second stage, there are three distinct parametric analyses, in which the model response sensibility is studied for variation of interface reduction factor, Eps50 and tensile cut-off. In additio

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16

Richardson, Mark Damian. "Dynamically installed anchors for floating offshore structures." University of Western Australia. School of Civil and Resource Engineering, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0230.

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The gradual depletion of shallow water hydrocarbon deposits has forced the offshore oil and gas industry to develop reserves in deeper waters. Dynamically installed anchors have been proposed as a cost-effective anchoring solution for floating offshore structures in deep water environments. The rocket or torpedo shaped anchor is released from a designated drop height above the seafloor and allowed to penetrate the seabed via the kinetic energy gained during free-fall and the anchors self weight. Dynamic anchors can be deployed in any water depth and the relatively simple fabrication and insta

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17

Shi, Qun. "Centrifugal modelling of surface footings subject to combined loadings." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.257515.

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18

Mondrago, Quevedo Monica. "Probabilistic modelling of geotechnical conditions for offshore wind turbine support structures." Thesis, Cranfield University, 2014. http://dspace.lib.cranfield.ac.uk/handle/1826/9205.

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The geotechnical conditions of the soil can fluctuate greatly across the wind farm. This is an issue since geotechnical modelling is the base of the structural design of an offshore wind farm, and the efficient installation of the wind turbines depends on its accuracy. This paper deals with the characterization of the seabed, predicting the soil properties over the total affected area by a wind farm, with the challenge to reduce the required data samples in the site investigation under the number of installed wind turbines, to reduce its cost. It is compared the prediction outcome from two dif

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19

Nguyen-Sy, Lam. "The theoretical modelling of circular shallow foundation for offshore wind turbines." Thesis, University of Oxford, 2005. http://ora.ox.ac.uk/objects/uuid:fa4000fb-8de6-4093-b528-3e60d774dea0.

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Currently, much research is being directed at alternative energy sources to supply power for modern life of today and the future. One of the most promising sources is wind energy which can provide electrical power using wind turbines. The increase in the use of this type of energy requires greater consideration of design, installation and especially the cost of offshore wind turbines. This thesis will discuss the modelling of a novel type of shallow foundation for wind turbines under combined loads. The footing considered in this research is a circular caisson, which can be installed by the su

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20

Thompson, Richard Saint George. "Development of non-linear numerical models appropriate for the analysis of jack-up units." Thesis, University of Oxford, 1996. http://ora.ox.ac.uk/objects/uuid:5804719a-8643-49c3-a9f3-105f35dce9ca.

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Jack-up units have considerable economic significance because they are used to carry out a large proportion of the world's oil and gas exploration in water depths less than 90.0m. Due to the increase in use of jack-ups in harsher environments, analysis techniques assuming quasi-static and linear structural behaviour have had to be reassessed. This thesis is concerned with non-linear dynamic analysis methods appropriate for a jack-up assessment. Jack-up modelling requires realistic representation of the structure, the foundations and the environmental loading, together with the implementation o

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21

Dallyn, Paul A. "Advances in foundation design and assessment for strategic renewable energy." Thesis, Loughborough University, 2017. https://dspace.lboro.ac.uk/2134/24100.

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In order to meet EU legislation on emissions, significant effort is being invested into the development of cost-effective renewable power generation technologies. The two leading technologies are solar and wind power because of their potential for the lowest levelised cost of energy and for showing a growth in installed capacity and technological development. Various research findings have suggested that significant cost savings in the capital expenditure of renewable energy projects can be made through the optimisation of their support foundations, the understanding of which has formed the ma

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22

Isorna, Rocio. "Etude de l’interaction sol-structure et de la fondation d’une éolienne offshore soumise à des chargements statiques/cycliques." Thesis, Ecole centrale de Nantes, 2017. http://www.theses.fr/2017ECDN0002/document.

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Les structures offshores sont conçues pour résister à des chargements environnementaux sévères. Des études expérimentales et numériques de la fondation d’une éolienne offshore soumise à des chargements statiques monotones/cycliques sont présentées dans ce manuscrit. Des pieux isolés (diamètre de 1,8 m et 40 m de longueur) et une structure en treillis fondée sur 4 pieux ont été testés à 100×g en centrifuge dans un massif de sable de Fontainebleau dense. Le comportement du pieu isolé a été identifié à travers des essais de chargement axial monotone. Différentes méthodes de mise en place de pieu

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23

Balachowski, Lech. "Différents aspects de la modélisation physique du comportement des pieux : chambre d'étalonnage et centrifugeuse." Grenoble INPG, 1995. http://www.theses.fr/1995INPG0067.

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Ce travail de recherche a ete effectue au sein du groupe geomecanique et ouvrages du laboratoire sols, solides, structures. Il concerne l'etude du comportement des pieux de grande dimension utilises comme fondations de structures en mer dans des sables denses. Cette etude a ete menee a l'aide de deux grands outils de modelisation physique: la chambre d'etalonnage du laboratoire 3s et la centrifugeuse du l. C. P. C de nantes. Les pieux installes pour des plates-formes petrolieres sont en general des pieux battus a base ouverte. Les essais de pieux realises en chambre d'etalonnage du laboratoire

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24

Carswell, Wystan. "Probabilistic Analysis of Offshore Wind Turbine Soil-Structure Interaction." 2012. https://scholarworks.umass.edu/theses/848.

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A literature review of current design and analysis methods for offshore wind turbine (OWT) foundations is presented, focusing primarily on the monopile foundation. Laterally loaded monopile foundations are typically designed using the American Petroleum Institute (API) p-y method for offshore oil platforms, which presents several issues when extended to OWTs, mostly with respect to the large pile diameters required and the effect of cyclic loading from wind and waves. Although remedies have been proposed, none have been incorporated into current design standards. Foundations must be uniquely d

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25

Po-KaiHsu and 許博凱. "Effect of Foundation Stiffness on Dynamic Responses of Offshore Wind Turbine Support Structures." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/a4jy83.

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Jun-TingChen and 陳俊廷. "Response Assessment of Supporting Structure for Offshore Wind Turbine on Monopile Foundation Subjected to Dynamic Loads." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/10936701172135365310.

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碩士<br>國立成功大學<br>土木工程學系<br>102<br>The main purpose of this study is to analyze the dynamic response of offshore wind turbines under dynamic loads. In order to estimate the shutdown standards, we use the results of the study and set the limit state of the wind turbines during the earthquake. In this paper, we use the p-y curve method and Winkler model for analysis. It can be obtained from the conclusion of the analysis when the load is low frequency. You can use the static soil stiffness. When the frequency of the load is high, we must use the dynamic soil stiffness. Using existing natural vibra

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27

Si-LingKuo and 郭思伶. "Numerical Analysis of Supporting Structure for Offshore Wind Turbine on Monopile Foundation Subjected to External Loads." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/98227255718907507237.

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碩士<br>國立成功大學<br>土木工程學系<br>102<br>In recent years, nations over the world are actively looking for new alternative energy due to environmental problems caused by traditional energy, and wind power is one of the alternative energy that many countries are developing actively. As wind farms on land have gone developed, European countries whose wind power techniques are more developed began to develop offshore wind power. Analysis of the seismic responses of the foundation of wind turbines is the basis of the assessment of geometric dimensioning during structure designing, developing testing techni

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28

Lopes, Adriana Torres. "O efeito da fundação no comportamento dinâmico de uma jacket quando sujeita à colisão." Master's thesis, 2018. http://hdl.handle.net/10316/84923.

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Dissertação de Mestrado Integrado em Engenharia Civil apresentada à Faculdade de Ciências e Tecnologia<br>O impacto de navios em estruturas offshore deve ser considerado aquando o dimensionamento deste tipo de estruturas. A ocorrência deste evento está associada a acções acidentais a que, de acordo com as normas Norsok N-003 e N-004, as estruturas devem resistir e o dano causado não deve induzir ao colapso progressivo da mesma. Desde há três décadas que estas normas utilizam como cenário de colisão um navio com 5000 ton à velocidade de 2m/s. Segundo diversos autores, é expectável que a revisão

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