Finite element analyses of improved lateral performance of monopile when combined with bucket foundation for offshore wind turbines

Wang, Jiayu; Sun, Guodong; Chen, Guangsi; Yang, Xu

doi:10.1016/j.apor.2021.102647

Cited by 22 publications

(10 citation statements)

References 36 publications

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“…Many loading tests and soil foundation set-up in laboratory tests for monopiles have been dealt in previous research [2,4,5,8,17,20]. Depending on the resources and equipment available, the test setups can be totally different for monopile loading tests even with the same objectives.…”

Section: Tests Modelsmentioning

confidence: 99%

“…Furthermore, Yang's research team [17] conducted finite element analyses and centrifuge model tests of the hybrid monopile with a mono-bucket for cohesionless soil; the hybrid monopile is called as pile-bucket foundation by them. They conducted push-over tests under a 50 g condition and the test models were built with a similarity ratio of 50 for the Putian project [16].…”

Section: Comparitive Analysis With Other Types Of Hybrid Monopilesmentioning

confidence: 99%

“…These advantages prompted the first hybrid monopile installation of an offshore wind farm at the Putian Pinghai Phase II site in China [16]. The hybrid monopile had a large suction bucket as a supplemental support, and its performances were verified by centrifuge tests of small-scaled models and FE analyses [17]. After that, in 2022, large monopiles with collared supports were placed at the Kaskasi offshore wind farm in Germany [18,19].…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Finite Element-Based Investigation on Lateral Behaviors of a Novel Hybrid Monopile

et al. 2022

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A monopile is the most conventional structure foundation for offshore wind turbines (OWTs) in the world. However, the Korean offshore wind industry has mostly been using the jacket type of foundation. The main reason for the current situation in Korea is that most of the marine soil consists of weak layers of sand and clay. Thus, the monopile foundation depth has to be deep enough to satisfy the intended serviceability design requirement of the monopile and the rotation limit at the seabed; a conventional monopile design concept alone might be insufficient in Korean offshore conditions, or otherwise could be very expensive, e.g., resulting in a rock socket installation at the tip of the monopile. The main objective of this paper is to introduce a novel hybrid monopile that is composed of a monopile and a supplemental support with three buckets, followed by assessing the lateral resistance of the hybrid system through physical experiments and finite element (FE) simulations. Namely, 1/64.5 small-scaled monopile and hybrid physical models with a monopile diameter of 7 m for a 5.5 MW OWT were loaded monotonically. The results show that the hybrid monopile improves the lateral bearing capacity regarding the initial lateral stiffness and ultimate load. The FE analyses of the corresponding physical models were also implemented to support the results from the physical model test. The numerical results, such as the structural member forces and soil deformation, were analyzed in detail. Additionally, a case study using FE analysis was conducted for the 5.5 MW OWT hybrid monopile support installed in a representative Korean weak soil area. The results show that the hybrid monopile foundation has a larger lateral resistance and stiffness than the monopile.

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Section: Tests Modelsmentioning

confidence: 99%

Section: Comparitive Analysis With Other Types Of Hybrid Monopilesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental and Finite Element-Based Investigation on Lateral Behaviors of a Novel Hybrid Monopile

et al. 2022

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“…Then, to simulate the flexibility of the monopile foundation (the transition plate), a concentrated spring model was introduced and the inertia and bending effects of the substructure were considered [20]. Wang et al studied the structure, employing centrifuge tests and FE analyses [21]. Chen et al carried out a fatigue bending test and axial compression test on the specimen.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Life and Crack Initiation in Monopile Foundation by Fatigue FE Analysis

et al. 2023

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The construction of new renewable energy infrastructures and the development of new ocean resources continues to proceed apace. In this regard, the increasing size and capacity of offshore wind turbines demands that the size of their accompanying supporting marine structures likewise increase. The types of marine structures utilized for these offshore applications include gravity base, monopile, jacket, and tripod structures. Of these four types, monopile structures are widely used, given that they are comparatively easy to construct and more economical than other structures. However, constant exposure to harsh cyclic environmental loads can cause material deterioration or the initiation of fatigue cracks, which can then lead to catastrophic failures. In this paper, a 3D fatigue finite element analysis was performed to predict both the fatigue life and the crack initiation of a welded monopile substructure. The whole analysis was undertaken in three steps. First, a 3D non-steady heat conduction analysis was used to calculate the thermal history. Second, a thermal load was induced, as an input in 3D elastoplastic analysis, in order to determine welding residual stresses and welding deformation. Finally, the plastic strain and residual stress were used as inputs in a 3D fatigue FE analysis in order to calculate fatigue crack initiation and fatigue life. The 3D fatigue finite element analysis was based on continuum damage mechanics (CDM) and elastoplastic constitutive equations. The results obtained from the 3D fatigue finite element analysis were compared with hot spot stresses and Det Norske Veritas (DNV-GL) standards.

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“…Previous research works have mainly focussed on researching the soil-pile interaction of wind turbine support structures, [7][8][9][10][11][12][13][14] fatigue assessments, design and performance, 3,[14][15][16][17][18][19][20] induced stresses in welds and connections and their performance [21][22][23][24][25] and recently, corrosion 26,27 while applying finite element analysis. 28,29 Although key findings involved optimised design parameters, stress concentrations and corrosion mechanisms, missing gaps include integrating these factors, mainly how corrosion and stresses interact in the support structure.…”

Section: Introductionmentioning

confidence: 99%

Stress analyses of high-rated capacity large diameter offshore wind turbines: Analytical and numerical analyses of uniform corrosion effects

Okenyi,

Bodaghi,

Siegkas

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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As the wind energy sector grows, offshore wind turbines (OWTs) have been pushed to have higher power outputs. This has led to large-diameter OWT support structures that are capable of withstanding aerodynamic and hydrodynamic loads as well as corrosion. This research analyses a 15-megawatt (MW) OWT support structure using analytical and numerical models. The analytical model was applied based on the Euler-Bernoulli beam theory. Static and modal finite element models were also applied. The structural stability implications of uniform corrosion on the stress evolution of the monopile and tower at different corrosion zones were discussed. Analytical and numerical (finite element analysis) predictions of stress evolution for different wind velocities and uniform corrosion material loss showed an agreement. The analyses showed that material loss due to corrosion increased the stress levels in the support structure. The location of the maximum tensile stress changed from the submerged to the splash zone, indicating that the splash zone may accumulate more damage over time due to the reduction of the monopile thickness and generation of local pits. Predicting the stress evolution due to uniform corrosion could be instrumental in the future designs of OWTs. It can be integral to fatigue assessments for enabling more detailed and accurate life predictions.

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Finite element analyses of improved lateral performance of monopile when combined with bucket foundation for offshore wind turbines

Cited by 22 publications

References 36 publications

Experimental and Finite Element-Based Investigation on Lateral Behaviors of a Novel Hybrid Monopile

Experimental and Finite Element-Based Investigation on Lateral Behaviors of a Novel Hybrid Monopile

Fatigue Life and Crack Initiation in Monopile Foundation by Fatigue FE Analysis

Stress analyses of high-rated capacity large diameter offshore wind turbines: Analytical and numerical analyses of uniform corrosion effects

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