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Tsetas, A. (author)The ambitious goals towards the decarbonization of the global energy sector have amplified the demand for renewable energy resources. Amongst the renewables, offshore wind possesses a pivotal role in this endeavour, showcasing remarkable growth in recent years. However, this rapid expansion has been accompanied by a series of technical...doctoral thesis 2023
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Kementzetzidis, E. (author)At the end of 2019, the European Union (EU) put forward the European Green Deal to facilitate the technological progress necessary to achieve CO2-neutrality by 2050. Such a monumental achievement would require massive investments in infrastructure for the harvesting, storage and the transnational transportation of green energy. To date, the more...doctoral thesis 2023
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van der Stap, Florian L. (author), Nielsen, Martin B. (author), Owen, C.C. (author), van der Male, P. (author), Hendrikse, H. (author)For the design of offshore foundations in regions such as the Baltic Sea, it is paramount that ice-structure interaction is appropriately considered. For the monopile, a common foundation for offshore wind turbines, challenges with ice-induced vibrations and high ridge loads may require ice-mitigating measures to be included in the design. A ...conference paper 2023
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Tsetas, A. (author), Tsouvalas, A. (author), Sánchez Gómez, S. (author), Pisano, F. (author), Kementzetzidis, Evangelos (author), Molenkamp, T. (author), Elkadi, A.S.K. (author), Metrikine, A. (author)Gentle Driving of Piles (GDP) is a new technology for the vibratory installation of tubular (mono)piles. Its founding principle is that both efficient installation and low noise emission can be achieved by applying to the pile a combination of axial and torsional vibrations. Preliminary development and demonstration of the proposed technology...journal article 2023
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Hammer, T.C. (author), Willems, Tom (author), Hendrikse, H. (author)For offshore wind farms which are planned in sub-arctic regions like the Baltic Sea and Bohai Bay, support structure design has to account for load effects from dynamic ice-structure interaction. There is relatively high uncertainty related to dynamic ice loads as little to no load- and response data of offshore wind turbines exposed to...journal article 2023
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Sensitivity of the seismic response of monopile-supported offshore wind turbines to soil variabilityPanagoulias, S. (author), de Winter, C. (author), Navalkar, S.T. (author), Nernheim, A. (author)The expansion of the offshore wind industry in areas with high seismicity has led to engineering challenges related to the design of the offshore wind turbines (OWTs). Monopiles, i.e., tubular steel piles of large outer diameter, low aspect ratio (penetration depth over outer diameter), and relatively thin pile wall, are traditionally the...journal article 2023
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Wang, H. (author), Lehane, B. M. (author), Bransby, M. F. (author), Wang, L. Z. (author), Hong, Y. (author), Askarinejad, A. (author)This paper presents a synthesis of recent and new research conducted by the authors on laterally loaded monopiles in drained sand. The research involved reduced-scale field tests, centrifuge model tests, finite element (FE) simulations and comparisons of design approaches with published experimental data. The influence of the monopile base on...journal article 2023
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Tjabering, Jorick (author), Fazi, S. (author), Ursavas, Evrim (author)The construction of offshore wind farms requires solving more and more complex logistical problems due to the increasing sizes of turbines and changing environments. In particular, the installation of substructures requires attention due to their significant impact on capital expenditures and the limited literature and guidelines available. In...journal article 2022
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Liu, Haoyuan (author), Pisano, F. (author), Jostad, Hans Petter (author), Sivasithamparam, Nallathamby (author)Offshore monopiles accumulate permanent tilt under long-lasting cyclic environmental loads. Accurate prediction of monopile tilt is key to assessing their serviceability, and requires a fundamental understanding of loading history effects. While both experimental and numerical studies are shedding light on this matter, this work uses step-by...journal article 2022
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Li, Q. (author), Gavin, Kenneth (author), Askarinejad, A. (author), Prendergast, L. J. (author)The influence of combined loading on the response of monopiles used to support offshore wind turbines (OWTs) is investigated in this paper. In current practice, resistance of monopiles to vertical and lateral loading is considered separately. As OWT size has increased, the slenderness ratio (pile length, L, normalised by diameter, D) has...journal article 2022
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Askarinejad, A. (author), Wang, H. (author), Chortis, Giorgos (author), Gavin, Kenneth (author)The scour protection layers are usually installed around the monopiles to prevent the formation of scour hole. While extensive studies have been performed on the effectiveness of scour protection layer as mitigation measure, no study to date has been found to quantify the influence of scour protection layer on the lateral response of...journal article 2022
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Meijers, P.C. (author)Increasing demand for energy from renewable sources has resulted in ambitious plans to construct a large number of offshore wind farms in the coming years. In relatively shallow water depths, the preferred support structure for wind turbines is the steel monopile, which is a thin-walled cylindrical structure. To decrease the cost of the...doctoral thesis 2021
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Cheng, Xiaoyang (author), Diambra, Andrea (author), Ibraim, Erdin (author), Liu, H. (author), Pisano, F. (author)Based on advanced 3D finite element modelling, this paper analyses the stress paths experienced by soil elements in the vicinity of a monopile foundation for offshore wind turbines subjected to cyclic loading with the aim of informing soil laboratory testing in support of monopile foundation design. It is shown that the soil elements in front of...journal article 2021
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Tsetas, A. (author), Tsouvalas, A. (author), Metrikine, A. (author)During the last decade the offshore wind industry grew ceaselessly and engineering challenges continuously arose in that area. Installation of foundation piles, known as monopiles, is one of the most critical phases in the construction of offshore wind farms. Prior to installation a drivability study is performed, by means of pile driving...journal article 2021
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Li, Q. (author), Askarinejad, A. (author), Gavin, Kenneth (author)The majority of offshore wind structures are supported on large-diameter, rigid monopile foundations. These piles may be subjected to scour due to the waves and currents that causes a loss of soil support and consequently decreases the pile capacity and system stiffness. The results of numerical models suggest that the shape of the scour hole...journal article 2021
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Wang, H. (author), Wang, Lizhong (author), Hong, Yi (author), Askarinejad, A. (author), He, Ben (author), Pan, Hualin (author)The large-diameter monopiles are the most preferred foundation used in offshore wind farms. However, the influence of pile diameter and aspect ratio on the lateral bearing behavior of monopiles in sand with different relative densities has not been systematically studied. This study presents a series of well-calibrated finite-element (FE)...journal article 2021
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Li, Q. (author)Although wind energy capacity has increased significantly in the last few decades, the installed capacity of offshore wind turbine still lags far behind that of onshore wind turbines due to the installation and foundation cost. The aim of this research project has been to clarify the influence of combined vertical and lateral loads, lateral...doctoral thesis 2020
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Liu, H. (author)The wind energy industry has gained a key role in the global fight against greenhouse gas emissions. Although fossil fuels have still the largest share in the global energy mix, the production of wind energy, especially offshore, has rapidly grown since the 1990s. According to the International Energy Association, Europe targets offshore wind to...doctoral thesis 2020
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Verma, Amrit Shankar (author), Jiang, Zhiyu (author), Gao, Zhen (author), Vedvik, Nils Petter (author)Single-blade installation is a conventional method for installing blades on monopile-type offshore wind turbines. A jack-up crane vessel is commonly used, and individual blades are lifted to the tower top height and mated with the hub. The relative motions between the hub and blade root during the mating phase, partly due to wind-induced...journal article 2020
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Li, Q (author), Prendergast, L. J. (author), Askarinejad, A. (author), Chortis, G. (author), Gavin, Kenneth (author)The majority of offshore wind turbines are founded on large-diameter, open-ended steel monopiles. Monopiles must resist lateral loads and overturning moments because of environmental (wind and wave) actions, whereas vertical loads tend to be comparatively small. Recent developments in turbine sizes and increases in hub heights have resulted...journal article 2020