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Tolooiyan, Ali (author), Gavin, Kenneth (author), Dyson, Ashley P. (author)
Accurate determination of the load-penetration behaviour of spudcan footings is vital in predicting the performance of offshore structures. Often, insufficient site investigation data is a limiting factor in assessing spudcan penetration, with the selection of suitable parameters typically derived from triaxial tests or Cone Penetrometer Test...
journal article 2024
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Latooij, Sean (author)
Jack-ups are used for offshore wind turbine installation (OWTI). To assess whether a jack-up can safely operate in a desired geographic location with known seismic activity, an earthquake response analysis is required for structural verification. This analysis is generally carried out according to the codes of the International Organization for...
master thesis 2023
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Dach, Florian (author)
The amount of floating offshore wind farms under development has drastically increased over the past years as the technology becomes viable for pre-commercial and commercial scale projects. Projects of this size require a streamlined, efficient production of the complete floating offshore wind turbine (FOWT), not only for manufacturing the...
master thesis 2023
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Wille, Seppe (author)
Offshore installation vessels are growing in size in order that they are capable of handling the next-generation 15 and 20MW wind turbines. At the same time, it is important to gain a better understanding of their structural behaviour using the finite element (FE) method. One approach that is often used is the full vessel FE analysis, which...
master thesis 2023
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Appert, Loïc (author)
Due to the increasing size of offshore wind turbines, the jack-up vessels and cranes installing them need to increase in size. The increase in length of the crane boom results in an increase of the dynamic response of the crane. This increase in response results in higher loads in the crane. The magnitude of the higher loads are unknown and not...
master thesis 2023
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Sonnema, Wouter (author), Brinkman, Sanne (author), Brinkgreve, R.B.J. (author), Pisano, F. (author)
Presented here is a numerical study on the preloading of four-legged jack-ups, such as those commonly employed in the construction of offshore wind farms. The need for reducing jack-up installation time is particularly felt within the offshore industry, especially when multiple preloading cycles are necessary in clayey soils to fulfil given...
journal article 2023
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Tolooiyan, Ali (author), Gavin, Kenneth (author), Dyson, Ashley P. (author)
Offshore jack-up rigs are most commonly founded on large-diameter conical “spudcan” foundations, which are frequently designed using traditional analytical methods for shallow footings. This paper presents the design of a spudcan installed off the coast of Tunisia. The maximum penetration depth of the footing under the available preload is...
journal article 2023
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van Engelen, Niels (author)
Due to a high demand for offshore wind energy the industry is expanding to evermore challenging locations such as seismic prone areas. The corresponding seismic shocks and vibrations can be transmitted to jack‐up vessels and their cranes used for the installation of these offshore wind turbines. Since a potential collapse due to seismic activity...
master thesis 2021
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Emondt, Erik (author)
Jack-up designers, owners and operators are expanding their activities into seismically active areas such as Japan and Taiwan. Further development of expertise in seismic analysis of jack-ups is required to improve safety and reduce costs. At present, a linear elastic foundation model is used in seismic assessments. Improved understanding of...
master thesis 2020
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Linthorst, Joost (author)
GustoMSC, an NOV company, is a market leader in the design of offshore wind installation jack-ups. Offshore wind turbine installation has been situated mainly in the North Sea, which is not very seismically active. As a consequence, wind turbine installation jack-ups have been designed and analysed for low seismic excitations. The offshore wind...
master thesis 2019
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Sonnema, Wouter (author)
Since the exploitation of wind as a renewable energy resource, jack-up vessels equipped with more than three independent legs are increasingly employed to transport and install the components of offshore wind turbines. By lowering the movable legs the vessel is able to elevate the hull from sea water level. In elevated position the vessel...
master thesis 2019
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Pisano, F. (author), Schipper, Robbin (author), Schreppers, Gerd Jan (author)
Jack-ups are mobile structures widely employed in the offshore industry as drilling rigs or installation/maintenance vessels (e.g. for offshore wind farms). To assure safety at each location, site-specific assessment is required to predict the performance of the unit during installation and operations. The response of jack-ups to...
journal article 2019
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Fila, Joep (author)
As the demand for renewable energy is constantly rising, more offshore wind farms are being built at sea to meet European targets towards sustainable energy transition. Van Oord’s offshore installation vessel Aeolus was purposely-built to transport and install foundations of offshore wind turbines. To ensure that the vessel remains competitive...
master thesis 2018
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Berbers, Stijn (author)
Seafox owns and operates a fleet of 12 Jack-ups. The design life of these Jack-ups is typically around 30 years. However, some have remained operational after exceeding their design life. It is therefore critical to gain an understanding how long and under what conditions these jacks-ups are still able to operate safely. There are two main...
master thesis 2017
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Schipper, R.H.J. (author)
Jack-up structures are widely used in the offshore industry. Not only in the field of oil and gas, but also in the installation for offshore wind turbines. These jack-up structures typically consist of three trusswork legs, where the foundation is formed by inverted conical cones that are penetrated into the soil, called spudcans. The spudcans...
master thesis 2016
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Van Dalfsen, A. (author)
Due to the growing offshore wind energy market and the increasing interest of the oil and gas industry, there is a steadily increasing demand for the use of jack-ups all over the world. Particularly, the number of wind turbine installation vessels has increased from 2 in 2005 to 40 currently, with a yearly growth expectation of 30% till 2020....
master thesis 2016
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Vellekoop, A. (author)
master thesis 2015
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Hoes, R.S. (author)
This thesis researches the change of the hydrodynamics of jack-up spudcans close to the seabed and the influence of this change on calculated jack-up motions. Two GustoMSC jack-up designs are selected as typical: a large drilling jack-up (CJ-70), and a small wind turbine installation vessel (NG-2500X). Limits for allowable wave heights during...
master thesis 2015
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Koole, T. (author)
This thesis describes an analysis of modern jack-up designs. Trends throughout the various designs are identified and justified. The environmental loads and dynamic response of these modern designs are analysed using the methodology as described in current guidelines. Furthermore, the water depth limit of current design philosophy is...
master thesis 2015
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Dimitriou, A. (author)
So far jack-ups have successfully operated in depths of 80 to 100 m and some are capable of operating in water depths of up to 150 m. In order to circumvent the depth limitation, it was suggested by Heerema Marine Contractors (HMC) that a base could be designed with the ability to support a jack-up rig, thereby increasing its operational depth...
master thesis 2014
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