Relevant bibliographies by topics / Offshore foundations

Academic literature on the topic 'Offshore foundations'

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Published: 4 June 2021
Last updated: 21 February 2023

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Journal articles on the topic "Offshore foundations"

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Vølund, Per. "Concrete is the Future for Offshore Foundations." Wind Engineering 29, no. 6 (December 2005): 531–63. http://dx.doi.org/10.1260/030952405776234571.

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This paper compares the costs of using concrete foundations against steel monopile foundations for offshore wind turbines, and argues that concrete foundations will be cheaper. Most offshore windfarms have steel monopile foundations, but in Denmark concrete gravity foundations have been used with success. Two projects have tendered for steel monopiles and for concrete foundations and have implemented the concrete foundations that proved cheaper. No project has tendered for both foundation concepts and chosen steel monopiles. Nysted Offshore Windfarm with concrete foundations has the cheapest foundations of any offshore windfarm so far. A conceptual foundation study carried out for the London Array West Offshore Windfarm indicates that the same method and very low-cost foundations as for Nysted can be used. Optimised design of light-weight concrete constructions is the key to low-cost installation. Cheap manufacture can be carried out near the site or at even lower cost in Eastern Europa from where it can be shipped at little extra cost. The main construction of steel monopile foundations will become twice as costly as of concrete gravity foundations, and though installation is more costly for the gravity foundations it seems most likely that tendering between steel monopile and concrete gravity for London Array West will prove concrete considerably cheaper. It is argued that these considerations are to a wide extent generally valid, and also for very large turbines in deeper water. Concrete foundations will in 2006 be installed at Lillegrunden Offshore Windfarm in Sweden, and at Belgian Thornton Bank in 2006–7. So indications are strong that concrete is the future for offshore foundations.
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Esteban, M., José-Santos López-Gutiérrez, and Vicente Negro. "Gravity-Based Foundations in the Offshore Wind Sector." Journal of Marine Science and Engineering 7, no. 3 (March 12, 2019): 64. http://dx.doi.org/10.3390/jmse7030064.

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In recent years, the offshore wind industry has seen an important boost that is expected to continue in the coming years. In order for the offshore wind industry to achieve adequate development, it is essential to solve some existing uncertainties, some of which relate to foundations. These foundations are important for this type of project. As foundations represent approximately 35% of the total cost of an offshore wind project, it is essential that they receive special attention. There are different types of foundations that are used in the offshore wind industry. The most common types are steel monopiles, gravity-based structures (GBS), tripods, and jackets. However, there are some other types, such as suction caissons, tripiles, etc. For high water depths, the alternative to the previously mentioned foundations is the use of floating supports. Some offshore wind installations currently in operation have GBS-type foundations (also known as GBF: Gravity-based foundation). Although this typology has not been widely used until now, there is research that has highlighted its advantages over other types of foundation for both small and large water depth sites. There are no doubts over the importance of GBS. In fact, the offshore wind industry is trying to introduce improvements so as to turn GBF into a competitive foundation alternative, suitable for the widest ranges of water depth. The present article deals with GBS foundations. The article begins with the current state of the field, including not only the concepts of GBS constructed so far, but also other concepts that are in a less mature state of development. Furthermore, we also present a classification of this type of structure based on the GBS of offshore wind facilities that are currently in operation, as well as some reflections on future GBS alternatives.
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Schneider, James A., and Marc Senders. "Foundation Design: A Comparison of Oil and Gas Platforms with Offshore Wind Turbines." Marine Technology Society Journal 44, no. 1 (January 1, 2010): 32–51. http://dx.doi.org/10.4031/mtsj.44.1.5.

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AbstractThe offshore oil and gas (O&G) industry has over 70 years of experience developing innovative structures and foundation concepts for engineering in the marine environment. The evolution of these structures has strongly been influenced by water depth as well as soil conditions in the area of initial developments. As the offshore wind industry expands from the glacial soil deposits of the North and Baltic Seas, experience from the O&G industry can be used to aid a smooth transition to new areas. This paper presents an introduction to issues that influence how design and construction experience from the O&G industry can be used to aid foundation design for offshore wind energy converters. A history of the evolution of foundation and substructure concepts in the Gulf of Mexico and North Sea is presented, followed by a discussion of soil behavior and the influence of regional geology on these developments. Mechanisms that influence the resistance of shallow and deep foundations for fixed and floating offshore structures are outlined so that areas of empiricism within offshore design codes can be identified and properly modified for application to offshore wind turbine foundations. It is concluded that there are distinct differences between offshore O&G and offshore wind turbine foundations, and application of continued research into foundation behavior is necessary for rational, reliable, and cost-effective design.
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Barari, Amin, Britta Bienen, Domenico Lombardi, and Shinji Sassa. "Offshore Wind Turbine Foundations." Soils and Foundations 61, no. 2 (April 2021): 621–22. http://dx.doi.org/10.1016/j.sandf.2020.12.004.

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Ding, Hongyan, Yanjian Peng, Puyang Zhang, Hanbo Zhai, and Nan Jia. "Model Tests on the Penetration Resistance of Bucket Foundations for Offshore Wind Turbines in Sand." Journal of Marine Science and Engineering 8, no. 5 (May 22, 2020): 368. http://dx.doi.org/10.3390/jmse8050368.

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Driven by the rapid development of offshore wind farms, bucket foundations have come to constitute a very promising form of foundation for offshore wind turbines, mainly owing to their efficient construction. However, the penetration resistance of the suction penetration of a bucket foundation, when calculated inaccurately, may lead to installation failure of the foundation. In this study, model tests were performed on the suction penetration of a mono-bucket mono-compartment foundation and a mono-bucket multi-compartment foundation in saturated fine marine sand, aiming to compare their penetration resistances and critical suctions, and the development of a soil plug in the two models was analyzed. The results will provide a design reference for the penetration construction of bucket foundations for offshore wind turbines.
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Iwicki, Piotr, and Jarosław Przewłócki. "Short Review and 3-D FEM Analysis of Basic Types of Foundation for Offshore Wind Turbines." Polish Maritime Research 27, no. 3 (September 1, 2020): 31–39. http://dx.doi.org/10.2478/pomr-2020-0044.

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AbstractSome problems of the foundations of offshore wind turbines are considered in this paper. A short review is presented on the two basic types of foundations, i.e. monopiles and gravity foundations, including their basic features and applications as well as general design considerations. Also, some issues regarding analysis are discussed, including geotechnical problems and modelling techniques. A numerical model of offshores turbine and some preliminary computations are presented. Finite element analysis was carried out for wind turbines supported on both gravity and monopile foundations. The wind turbine tower, blades (simplified model), gravity foundation and part of the surrounding soil are included in the model. The turbine was loaded by wind and loads induced by waves, inertia and gravity. Both non-linear static and dynamic analysis of the wind turbine was performed. The displacements and stresses under the tower foundations were calculated and a comparison analysis carried out.
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Moller, Anders. "Efficient Offshore Wind Turbine Foundations." Wind Engineering 29, no. 5 (September 2005): 463–69. http://dx.doi.org/10.1260/030952405775992580.

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In the oil and gas industry, the foundations of offshore platforms have, for decades, used the grouted technique. This technology has now been transferred into the offshore wind turbine industry. This paper gives details of the use of the technology in some of the first offshore windfarms in Europe and considers future design possibilities.
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Lavanya, C., and Nandyala Darga Kumar. "Foundation Types for Land and Offshore Sustainable Wind Energy Turbine Towers." E3S Web of Conferences 184 (2020): 01094. http://dx.doi.org/10.1051/e3sconf/202018401094.

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Wind energy is the renewable sources of energy and it is used to generate electricity. The wind farms can be constructed on land and offshore where higher wind speeds are prevailing. Most offshore wind farms employ fixed-foundation wind turbines in relatively shallow water. In deep waters floating wind turbines have gained popularity and are recent development. This paper discusses the various types of foundations which are in practice for use in wind turbine towers installed on land and offshore. The applicability of foundations based on depth of seabed and distance of wind farm from the shore are discussed. Also, discussed the improvement methods of weak or soft soils for the foundations of wind turbine towers.
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Byrne, B. W., and G. T. Houlsby. "Foundations for offshore wind turbines." Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences 361, no. 1813 (November 4, 2003): 2909–30. http://dx.doi.org/10.1098/rsta.2003.1286.

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Clauss, G. F., and R. Schmitz. "Flat foundations for offshore platforms." International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts 27, no. 2 (April 1990): A110. http://dx.doi.org/10.1016/0148-9062(90)95236-t.

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Dissertations / Theses on the topic "Offshore foundations"

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Kopp, Duncan Rath. "Foundations for an offshore wind turbine." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/60766.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2010.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 75-76).
Worldwide energy demand is growing rapidly, and there is great interest in reducing the current reliance on fossil fuels for uses such as power generation, transportation, and manufacturing. Renewable energy sources, such as solar and wind, are abundant but have very low power densities. The US is in the process of approving its first offshore wind farm, located in Nantucket Sound. Geotechnical factors will play a large role in the development of offshore wind projects due to the high cost contribution from foundations, and the high loads associated with storm conditions. Offshore wind turbine foundations provide unique design challenges. First, various foundation alternatives exist, so it is important that an appropriate cost-effective foundation type be selected. Second, the loads and soil conditions will vary for each location. Therefore, it is important to ensure the foundation can adequately support vertical and horizontal loads. Finally, each turbine manufacturer has unique deflection and rotation criteria. Therefore, the foundation should perform within those tolerances, even under worst-case loading. This thesis considers the performance of a monopile foundation under typical vertical and horizontal storm loading conditions. Capacity, deflection, and rotation of a proposed monopile foundation are calculated by various methods to simulate the design procedure. The results show that very stiff foundations are required to keep pile head movements within design tolerances.
by Duncan Rath Kopp.
M.Eng.
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Floridia, Daniele. "Hybrid foundations for offshore wind turbines." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3284/.

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Nowadays offshore wind turbines represents a valid answer for energy production but with an increasing in costs mainly due to foundation technology required. Hybrid foundations composed by suction caissons over which is welded a tower supporting the nacelle and the blades allows a strong costs reduction. Here a monopod configuration is studied in a sandy soil in a 10 m water depth. Bearing capacity, sliding resistance and pull-out resistance are evaluated. In a second part the installation process occurring in four steps is analysed. considering also the effect of stress enhancement due to frictional forces opposing to penetration growing at skirt sides both inside and outside. In a three dimensional finite element model using Straus7 the soil non-linearity is considered in an approximate way through an iterative procedure using the Yokota empirical decay curves.
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Villalobos, Jara Felipe Alberto. "Model testing of foundations for offshore wind turbines." Thesis, University of Oxford, 2006. http://ora.ox.ac.uk/objects/uuid:438cfe69-c8d4-4630-ab0b-482da5ea2839.

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Suction caissons are a new foundation option for offshore wind turbines. This thesis is focussed on the behaviour of suction caisson foundations in sand and in clay during installation, and under subsequent vertical and combined moment-lateral loadings. The research is based on extensive experimental work carried out using model scaled caissons. The analysis of the results allowed the determination of parameters for hyperplasticity models. Model caissons were vertically loaded in loose and dense sands to study in service states and plastic behaviour. Bearing capacity increased with the length of the caisson skirt. The bearing capacity formulation showed that the angle of friction mobilised was close to the critical state value for loose sands and close to those of peak values due to dilation for dense sands. The vertical load increased, though at a lower rate than during initial penetration, after large plastic displacements occurred. A hardening law formulation including this observed behaviour is suggested. In sand the installation of caissons by suction showed a drastic reduction in the net vertical load required to penetrate the caisson into the ground compared with that required to install caissons by pushing. This occurred due to the hydraulic gradients created by the suction. The theoretical formulations of the yield surface and flow rule were calibrated from the results of moment loading tests under low constant vertical loads. The fact that caissons exhibit moment capacity under tension loads was considered in the yield surface formulation. Results from symmetric and non symmetric cyclic moment loading tests showed that Masing’s rules were obeyed. Fully drained conditions, partially drained and undrained conditions were studied. Caisson rotation velocities scaled in the laboratory to represent those in the field induced undrained response for relevant periods of wave loading, a wide range of seabed permeabilities and prototype caisson dimensions. Under undrained conditions and low constant vertical loads the moment capacity of suction caissons was very small. Under partially drained conditions the moment capacity decreased with the increase of excess pore pressure. In clay, vertical cyclic loading around a mean vertical load of zero showed that in the short term the negative excess pore pressures generated during suction installation reduced vertical displacements. The yield surface and the flow rule were determined from moment swipe and constant vertical load tests. The moment capacity was found to depend on the ratio between the preload Vo and the ultimate bearing capacity Vu. Gapping response was observed during cyclic moment loading tests, but starting at smaller normalised rotations than in the field. The hysteresis loop shape obtained during gapping cannot be reproduced by means of the Masing’s rules.
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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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Ngo-Tran, Cong Luan. "The analysis of offshore foundations subjected to combined loading." Thesis, University of Oxford, 1996. http://ora.ox.ac.uk/objects/uuid:96a07b7a-58f8-4a5d-9dfd-68509546368c.

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This thesis is concerned with four different types of offshore foundations, namely gravity foundations, jack-up foundations, the mudmats for piled jacket structures and caisson foundations for jacket structures. In most applications, these can be idealised as circular rigid foundations. Unlike onshore foundations, offshore foundations are subjected to large horizontal and moment loads. This research used the finite element method to examine the elastic behaviour and stability of circular footings under combined loading. Due to the circular shape of the footings and the combination of vertical, horizontal and moment loads, three dimensional finite element analysis was used. In-depth analyses of the elastic behaviour of circular footings under combined loading (V,H,M) were performed. The vertical stiffness coefficient was investigated using two dimensional axi-symmetric analyses whereas three dimensional analyses were used to examine the other coefficients. Different features of offshore foundations such as footing embedment and cone angle were taken into consideration. Based on the numerical results, a set of empirical expressions for elastic stiffness coefficient was derived. For footing stability calculations, large horizontal or moment loads can cause the footing to lose contact with the soil, or cause the footing to slide relative to the soil. In finite element analyses, this loss of contact and sliding are modelled by interface elements. A new zero-thickness iso-parametric interface element was formulated for both two and three dimensional analyses. An exact close formed solution for integration of the stress-strain relationship (for the two dimensional interface element) was found. The element is then used to explore footing stability. It was shown that by using a yield criteria which allows the interface to behave as either frictional or cohesive interface, depending upon the normal stress, numerical stability is achieved. The footing stability was examined by establishing the bearing capacity envelope. The envelopes for footings on undrained clays were established for surface flat strip footings and for surface flat circular footings. The effects of soil strength varying with depth, cone angle and embedment on the bearing capacity envelope were also investigated.
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Taiebat, Hossein Ali. "THREE DIMENSIONAL LIQUEFACTION ANALYSIS OF OFFSHORE FOUNDATIONS." Thesis, The University of Sydney, 1999. http://hdl.handle.net/2123/499.

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This thesis presents numerical techniques which have been developed to analyse three dimensional problems in offshore engineering. In particular, the three dimensional liquefaction analysis of offshore foundations on granular soils is the main subject of the thesis. The subject matter is broadly divided into four sections: 1)Development of an efficient method for the three dimensional elasto?plastic finite element analysis of consolidating soil through the use of a discrete Fourier representation of field quantities. 2)Validation of the three dimensional method through analyses of shallow offshore foundations subjected to three dimensional loading and investigation of the yield locus for foundations on purely cohesive soils. 3)Formulation of governing equations suitable for three dimensional liquefaction analyses of offshore foundations founded on granular soil, presentation of a method for liquefaction analyses, and application of the method in modified elastic liquefaction analyses of offshore foundations. 4)Application of a conventional elasto?plastic soil model in the liquefaction analyses of offshore foundations using the three dimensional finite element method. The finite element method developed in this thesis provides a rigorous and efficient numerical tool for the analysis of geotechnical problems subjected to three dimensional loading. The efficiency of the numerical tool makes it possible to tackle some of the problems in geotechnical engineering which would otherwise need enormous computing time and thus would be impractical. The accuracy of the numerical scheme is demonstrated by solving the bearing capacity problem of shallow foundations subjected to three dimensional loading. The generalized governing equations and the numerical method for liquefaction analyses presented in this thesis provide a solid base for the analysis of offshore foundations subjected to cyclic wave loading where they are founded on potentially liquefiable soil. The practicability of the numerical scheme is also demonstrated by a modified elastic liquefaction analysis of offshore foundations. The liquefaction phenomenon is redefined in the context of the conventional Mohr?Coulomb model, so that a relatively simple and practical model for elasto?plastic liquefaction analysis is presented. The three dimensional finite element method together with the numerical scheme for liquefaction analysis and the elasto?plastic soil model provide a suitable practical engineering tool for exploring the responses of offshore foundations subjected to cyclic wave loading.
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Taiebat, Hossein Ali. "THREE DIMENSIONAL LIQUEFACTION ANALYSIS OF OFFSHORE FOUNDATIONS." University of Sydney. Civil Engineering, 1999. http://hdl.handle.net/2123/499.

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This thesis presents numerical techniques which have been developed to analyse three dimensional problems in offshore engineering. In particular, the three dimensional liquefaction analysis of offshore foundations on granular soils is the main subject of the thesis. The subject matter is broadly divided into four sections: 1)Development of an efficient method for the three dimensional elasto?plastic finite element analysis of consolidating soil through the use of a discrete Fourier representation of field quantities. 2)Validation of the three dimensional method through analyses of shallow offshore foundations subjected to three dimensional loading and investigation of the yield locus for foundations on purely cohesive soils. 3)Formulation of governing equations suitable for three dimensional liquefaction analyses of offshore foundations founded on granular soil, presentation of a method for liquefaction analyses, and application of the method in modified elastic liquefaction analyses of offshore foundations. 4)Application of a conventional elasto?plastic soil model in the liquefaction analyses of offshore foundations using the three dimensional finite element method. The finite element method developed in this thesis provides a rigorous and efficient numerical tool for the analysis of geotechnical problems subjected to three dimensional loading. The efficiency of the numerical tool makes it possible to tackle some of the problems in geotechnical engineering which would otherwise need enormous computing time and thus would be impractical. The accuracy of the numerical scheme is demonstrated by solving the bearing capacity problem of shallow foundations subjected to three dimensional loading. The generalized governing equations and the numerical method for liquefaction analyses presented in this thesis provide a solid base for the analysis of offshore foundations subjected to cyclic wave loading where they are founded on potentially liquefiable soil. The practicability of the numerical scheme is also demonstrated by a modified elastic liquefaction analysis of offshore foundations. The liquefaction phenomenon is redefined in the context of the conventional Mohr?Coulomb model, so that a relatively simple and practical model for elasto?plastic liquefaction analysis is presented. The three dimensional finite element method together with the numerical scheme for liquefaction analysis and the elasto?plastic soil model provide a suitable practical engineering tool for exploring the responses of offshore foundations subjected to cyclic wave loading.
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Mangal, Jan Krishna. "Partially-drained loading of shallow foundations on sand." Thesis, University of Oxford, 1999. http://ora.ox.ac.uk/objects/uuid:205bf0bc-b801-4648-a556-8dba0d113cba.

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Wave loading on offshore structures founded on sand can result in partially drained response of the foundation soil. The characteristics of the rate of loading, the permeability of the soil, and the size of the foundation affect the degree of partial drainage. Partial drainage refers to situations where pore pressures develop in the soil, and the response of the soil is neither fully drained nor undrained. This thesis is concerned with the effects of loading rate, and consequent drainage, on the behaviour of a flat footing that is founded on the surface of a saturated sand base. The results of physical tests performed in the laboratory on a model-sized footing are reported. The footing was founded on oil-saturated fine sand and was subjected to combined loading. The effect of the vertical, horizontal, and rotational displacements are reported. The response of the footing is analysed in the context of existing drained foundation models that are based on work hardening plasticity theory. The rate dependency of the vertical load:deformation behaviour and the combined yield surfaces are described.
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Wilberts, Frauke. "MEASUREMENT DRIVEN FATIGUE ASSESSMENT OF OFFSHORE WIND TURBINE FOUNDATIONS." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-337960.

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The installed capacity of offshore wind turbines in Europe is increasing with the monopile being the most common type of foundation. During its lifetime an offshore wind turbine is exposed to high dynamic loads which eventually can result in the fatigue of the substructure. This thesis will show how the linear damage accumulation approach based on the Miner’s rule can be used to estimate the damage induced on the substructure of an offshore wind turbine using measurements from strain gauges. Furthermore, the most important environmental influences will be illustrated and the different stress concentration factors and the size effect introduced in the industry guideline DNVGL-RP-C203 will be analysed towards their effect on the calculated lifetime.
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Al-Baghdadi, Therar. "Screw piles as offshore foundations : numerical and physical modelling." Thesis, University of Dundee, 2018. https://discovery.dundee.ac.uk/en/studentTheses/336c5661-e871-416d-9d69-4bb4f421bda7.

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In reviewing the recent development of the geotechnical engineering aspects of the offshore wind farm industry, it was found that there is an urgent need for more reliable and cost-effective foundation solutions. In this thesis, screw piles (helical piles) have been proposed as a potential innovative alternative foundation for offshore wind turbines in deeper water. This type of pile has been used widely as foundation and anchor for onshore projects due to their ability to provide high compressive and tensile resistance as well as reduced noise/vibration during installation. In order to adopt the screw pile technique as an offshore foundation, the geometry of the piles would need to be scaled up so they can provide the high capacities required for this application. Such change in size and geometry will lead to uncertainties in predicting the required installation torque and the capacity in different soil types and stress histories. For example, without the ability to accurately predict installation torque, it is difficult to design screw piles for offshore use or develop appropriate installation plant with the required torque capabilities in different soils. In this thesis, non-linear Finite Element Method (2D & 3D) was used to investigate the screw pile behaviour under lateral, vertical and combined loading. The FEM was also used to investigate the optimum spacing of the helical plates and the geometry effects on the screw pile behaviour to meet requirements of the loading conditions experienced for offshore application. In addition, 29 successful centrifuge tests were carried out using a newly developed servo-actuator so that the screw pile models could be installed and tested inflight in one operation at 50g acceleration. The centrifuge tests of screw pile models and CPTs were carried out in sand at three different relative densities (loose, medium and dense). The installation force (Fv) and torque (T) were correlated to the cone resistance (qc) to establish a CPT-based design method to predict the required installation force and torque for the straight-shafted pile and the modified screw pile geometries. A modified theoretical model was used to predict the installation torque of straight-shafted pile and screw pile in sand with different relative densities based on pile geometry characteristics and soil properties. Furthermore, the ultimate compressive capacities (Qc) of straight-shafted piles and screw pile in sand with different relative densities were determined from centrifuge tests and used to develop appropriate design parameters including earth pressure coefficient (k) and bearing capacity factors (Nq) for pushed and rotated piles.
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Books on the topic "Offshore foundations"

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Kay, Steve, Susan Gourvenec, Elisabeth Palix, and Etienne Alderlieste. Intermediate Offshore Foundations. First edition. | Abingdon, Oxon ; Boca Raton, FL : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9780429423840.

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Deepwater foundations and pipeline geomechanics. Ft. Lauderdale, FL: J. Ross Pub., 2011.

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Lesny, Kerstin. Foundations for offshore wind turbines: Tools for planning and design. Essen: VGE Verlag GmbH, 2010.

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Magued, Iskander, Laefer Debra F, Hussein Mohamad H, American Society of Civil Engineers. Geo-Institute, Association of Drilled Shaft Contractors (U.S.), and Pile Driving Contractors Association (U.S.), eds. Contemporary topics in deep foundations: Selected papers from the 2009 International Foundation Congress and Equipment Expo, March 15-19, 2009, Orlando, Florida. Reston, Va: American Society of Civil Engineers, 2009.

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Scour at marine structures: A manual for practical applications. London: Thomas Telford, 1998.

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Jørgen, Fredsøe, ed. The mechanics of scour in the marine environment. River Edge, N.J: World Scientific, 2002.

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A, Ardus D., and Society for Underwater Technology, eds. Offshore site investigation and foundation behaviour: Papers presented at a conference organized by the Society for Underwater Technology and held in London, UK, September 22-24, 1992. Dordrecht: Kluwer Academic, 1993.

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Ardus, D. A. Offshore Site Investigation and Foundation Behaviour: Papers presented at a conference organized by the Society for Underwater Technology and held in London, UK, September 22-24, 1992. Dordrecht: Springer Netherlands, 1993.

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Semple, R. M. Background to guidance on foundations and site investigations for offshore structures: Report of the Department of Energy, Guidance Notes Revision Working Group. London: H.M.S.O., 1986.

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Ardus, D. A., D. Clare, A. Hill, R. Hobbs, R. J. Jardine, and J. M. Squire, eds. Offshore Site Investigation and Foundation Behaviour. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-017-2473-9.

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Book chapters on the topic "Offshore foundations"

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Chaney, Ronald C., and Kenneth R. Demars. "Offshore Structure Foundations." In Foundation Engineering Handbook, 679–734. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3928-5_18.

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Kay, Steve, Susan Gourvenec, Elisabeth Palix, and Etienne Alderlieste. "Loading conditions and soil drainage." In Intermediate Offshore Foundations, 35–40. First edition. | Abingdon, Oxon ; Boca Raton, FL : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9780429423840-5.

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Kay, Steve, Susan Gourvenec, Elisabeth Palix, and Etienne Alderlieste. "Design basis." In Intermediate Offshore Foundations, 59–73. First edition. | Abingdon, Oxon ; Boca Raton, FL : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9780429423840-8.

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Kay, Steve, Susan Gourvenec, Elisabeth Palix, and Etienne Alderlieste. "In-place resistance." In Intermediate Offshore Foundations, 175–240. First edition. | Abingdon, Oxon ; Boca Raton, FL : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9780429423840-10.

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Kay, Steve, Susan Gourvenec, Elisabeth Palix, and Etienne Alderlieste. "In-place response." In Intermediate Offshore Foundations, 241–54. First edition. | Abingdon, Oxon ; Boca Raton, FL : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9780429423840-11.

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Kay, Steve, Susan Gourvenec, Elisabeth Palix, and Etienne Alderlieste. "Introduction." In Intermediate Offshore Foundations, 1–6. First edition. | Abingdon, Oxon ; Boca Raton, FL : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9780429423840-1.

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Kay, Steve, Susan Gourvenec, Elisabeth Palix, and Etienne Alderlieste. "Hazards, uncertainties and risk minimisation." In Intermediate Offshore Foundations, 41–54. First edition. | Abingdon, Oxon ; Boca Raton, FL : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9780429423840-6.

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Kay, Steve, Susan Gourvenec, Elisabeth Palix, and Etienne Alderlieste. "Miscellaneous design considerations." In Intermediate Offshore Foundations, 255–74. First edition. | Abingdon, Oxon ; Boca Raton, FL : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9780429423840-12.

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Kay, Steve, Susan Gourvenec, Elisabeth Palix, and Etienne Alderlieste. "Marine geology." In Intermediate Offshore Foundations, 31–34. First edition. | Abingdon, Oxon ; Boca Raton, FL : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9780429423840-4.

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Kay, Steve, Susan Gourvenec, Elisabeth Palix, and Etienne Alderlieste. "Offshore foundation types and mode of operation." In Intermediate Offshore Foundations, 7–23. First edition. | Abingdon, Oxon ; Boca Raton, FL : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9780429423840-2.

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Conference papers on the topic "Offshore foundations"

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Andersen, Knut H., and Hans Petter Jostad. "Foundation Design of Skirted Foundations and Anchors in Clay." In Offshore Technology Conference. Offshore Technology Conference, 1999. http://dx.doi.org/10.4043/10824-ms.

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Byrne, B. W., and G. T. Houlsby. "Investigating Novel Foundations for Offshore Windpower Generation." In ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/omae2002-28423.

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In recent years there has been a worldwide increase in the pressure to develop sources of renewable energy. The UK government is committed to ensuring that ten percent of UK energy consumption will be supplied by renewables by the year 2010. Central to this commitment is the need to develop wind farms particularly in the offshore environment. Moving offshore will allow very large wind turbines capable of supplying 2 MW (first generation) to 5 MW (second generation) of power to be installed in large farms consisting of up to fifty or more turbines. In contrast to typical oil and gas structures the foundation may account for up to forty percent of the projected installed cost. The weight of each structure is very low, so the applied vertical load on the foundation will be small compared to the moment load derived from the wind and waves. Further, it will be necessary to have a single design that can be mass-produced over each site rather than have each foundation individually engineered. In combination these points lead to a very interesting engineering problem where the design of the foundation becomes crucial to the economics of the project. One solution is to use conventional piling. However, at some sites it may prove more economical to use shallow foundations, and, in particular suction installed skirted foundations [1]. It will be necessary to develop an adequate design framework for these no vel foundations under the relevant combinations of load so that the optimum structural configuration can be achieved. At Oxford University a program of research on skirted foundations has been underway for the last five years, and much progress has been made on the understanding of this type of foundation under combined loading. This progress has been in both experimental and theoretical areas. This paper explores various structural options that might be used for the wind turbine application. These different options lead to different loading conditions on the foundations. Experiments investigating these different loading conditions are explored. A theoretical approach that describes the experimental results in a way that can be implemented in typical structural analyses programs is outlined. Finally details of a major research program into developing the necessary design guidelines for foundations for offshore wind turbines is described.
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Kolk, H. J., S. Kay, A. Kirstein, and H. Troestler. "North Nemba Flare Bucket Foundations." In Offshore Technology Conference. Offshore Technology Conference, 2001. http://dx.doi.org/10.4043/13057-ms.

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Bye, A., C. Erbrich, B. Rognlien, and T. I. Tjelta. "Geotechnical Design of Bucket Foundations." In Offshore Technology Conference. Offshore Technology Conference, 1995. http://dx.doi.org/10.4043/7793-ms.

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Feng, Xiaowei, and Susan Gourvenec. "Optimal Shear Key Interval for Offshore Shallow Foundations." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10118.

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Embedment of offshore shallow foundations is typically achieved by ‘skirts’, i.e. thin vertical plates that protrude from the underside of a foundation top plate and penetrate the seabed confining a soil plug. Skirted shallow foundations are often idealized as a solid, rigid element for geotechnical analysis of the foundation, on the assumption that sufficient skirts, or ‘shear keys’ will be provided to ensure that the deformable soil plug displaces as a rigid body. Should too few shear keys be provided, failure mechanisms involving deformation within the soil plug may occur, leading to a reduction in load-carrying capacity. There is currently no formal guidance regarding the optimal spacing of shear keys to ensure rigid body displacement of the soil plug. The absence of guidance may lead to unconservative designs if the number of shear keys is under estimated to save on fabrication or to conservative designs if additional shear keys are provided to minimize the risk associated with the uncertainty. Either case is undesirable and clear benefit is to be gained from a better understanding of shear key spacing. This paper presents guidance on the minimum number of shear keys required to achieve optimal capacity of square and rectangular skirted foundations (i.e. equivalent to that of a solid rigid foundation) under undrained generalized six degree-of-freedom loading in soft soils with linearly increasing shear strength with depth.
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Rahim, A., and A. Mirdamadi. "Design Requirements for Offshore Wind Tower Foundations and Comparison with Oil and Gas Foundations." In Offshore Technology Conference. Offshore Technology Conference, 2017. http://dx.doi.org/10.4043/27580-ms.

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Kumar, Chaithanya, Sandhria Ferriawan Agung Pambudi, Milind Manohar Salunke, and John William Rayappa. "Alternate Foundation Concepts for Offshore Jackets in Calcareous Soils." In Offshore Technology Conference Asia. OTC, 2022. http://dx.doi.org/10.4043/31595-ms.

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Abstract Calcareous soil type is found at many locations, requiring careful selection of foundation type. Calcareous soil is mostly or partly composed of calcium carbonate in the form of lime or chalk derived from the underlying chalk or limestone rock. North-West Shelf of Australia is an example of site which consists of carbonate soil types wherein the majority of existing offshore facilities and platforms being installed using Drilled and Grouted (D&G) piled foundations and in some instances using Gravity based foundations. This paper discusses alternate foundation concepts on such soils, namely; (i) Micro-piles, and (ii) Inclined pile cluster, along with the common concepts of (iii) D&G piles and (iv) Gravity based foundations. The foundation concepts are discussed with focus on key aspects of the foundation structural configuration, vertical foundation capacity feasibility, and some serviceability related aspects. In addition, offshore operation and installation duration perspective are also discussed to provide some insight on how each foundation concept could suit the project preference which often influence the final selection of foundation concept. Risk/challenges and advantages of each concept are then summarized for overall comparison.
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Malhotra, Sanjeev. "Design and Construction Considerations for Offshore Wind Turbine Foundations." In ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2007. http://dx.doi.org/10.1115/omae2007-29761.

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With the growing energy needs of the world and the sustainable nature of wind energy this sector is a highly innovative growth industry. The past years have seen the industry develop and test not only more efficient, but also much larger wind turbines than those that are in current use. The next generation of wind turbines that are on the drawing boards are gigantic in size. These huge dimensions of the proposed wind turbines will put large demands on the foundations. As an increasing number of wind farms are being planned offshore in water depths of over 40 m, the combination of water depth and the increased windmill tower heights and rotor blade diameters create loads that make foundation design very complex. Moreover, offshore foundations are exposed to additional loads such as ocean currents, storm wave loading, ice loads and potential ship impact loads. All of these factors pose significant challenges in the design and construction of wind turbine foundations. This paper presents the various issues facing the designer in designing and constructing wind turbine tower foundations. Current practices are summarized to assist developers in foundation type selection and design.
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Karal, Karel, J. M. Hermstad, Kjell Vigander, Jan Skjong, and Øivind Pedersen. "Concrete Foundations for TLP's." In Offshore Technology Conference. Offshore Technology Conference, 1992. http://dx.doi.org/10.4043/6897-ms.

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Low, Han Eng, Fangyuan Zhu, Henning Mohr, Phillip Watson, Carl Erbrich, Conleth O’Loughlin, Fraser Bransby, Mark Randolph, Thaleia Travasarou, and Daniel O’Connell. "Offshore Wind Turbine Mono-Bucket Foundations in Sand." In ASME 2021 40th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/omae2021-62260.

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Abstract Single (or mono) suction buckets have been put forward by others as possible offshore wind turbine (OWT) foundations. This paper presents a series of centrifuge model tests conducted in dense sand to investigate their monotonic response for a range of drainage conditions. The results from the centrifuge tests suggest that the mono-bucket rotational response at large rotation in dense sand is dependent on drainage conditions but does not seem to be affected by the contact condition between the bucket invert and the seabed. A final comparison between results from an equivalent set of uplift tests suggests, however, that multi-bucket foundation systems are likely to be more efficient foundation solutions, although suggestions are made which might improve mono-bucket foundation response.
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Reports on the topic "Offshore foundations"

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Yokel, Felix Y., and Robert G. Bea. Mat foundations for offshore structures in Arctic regions. Gaithersburg, MD: National Bureau of Standards, 1987. http://dx.doi.org/10.6028/nbs.ir.86-3419.

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Afjeh, Abdollah A., Nautica Windpower, Joseph Marrone, and Thomas Wagner. Advanced Offshore Wind Turbine/Foundation Concept for the Great Lakes. Office of Scientific and Technical Information (OSTI), August 2013. http://dx.doi.org/10.2172/1227612.

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Kuuskraa, Vello. Building the Foundation for Assessing GOM Offshore CO2 EOR and CO2 Storage. Office of Scientific and Technical Information (OSTI), December 2020. http://dx.doi.org/10.2172/1763966.

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Wang, Wei, Michael Brown, Matteo Ciantia, and Yaseen Sharif. DEM simulation of cyclic tests on an offshore screw pile for floating wind. University of Dundee, December 2021. http://dx.doi.org/10.20933/100001231.

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Screw piles need to be upscaled for offshore use e.g. being an alternative foundation and anchor form for offshore floating wind turbines, although the high demand of vertical installation forces could prevent its application if conventional pitch-matched installation is used. Recent studies, using numerical and centrifuge physical tests, indicated that the vertical installation force can be reduced by adopting over-flighting which also improved axial uplift capacity of the screw pile. The current study extends the scope to axial cyclic performance with respect to the installation approach. Using quasi-static discrete element method (DEM) simulation it was found that the over-flighted screw pile showed a lower displacement accumulation rate, compared to a pitch-matched installed pile, in terms of load-controlled cyclic tests. Sensitivity analysis of the setup of the cyclic loading servo shows the maximum velocity during the tests should be limited to avoid significant exaggeration of the pile displacement accumulation but this may lead to very high run durations.
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