A comparative study of three onshore wind turbine foundation solutions

Mohamed, Wael; Austrell, Per Erik

doi:10.1016/j.compgeo.2017.08.022

Cited by 22 publications

(15 citation statements)

References 4 publications

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“…The presence of the WL above the foundation base reduces the effective weight of the submerged portion of the foundation, reducing the overall vertical load and increasing the eccentricity (Tinjum and Christensen, 2010). The foundation diameter is increased by approximately 15% to 20% when the WL is at the ground surface compared with a WL deep below the surface (Mohamed and Austrell, 2017). In certain soils, cyclic degradation with multiple instances of zero pressure could lead to breakdown of the in situ soil structure and subsequent serviceability problems in the presence of water (Morgan and Ntambakwa, 2008).…”

Section: A) Shallow Foundations: Worldwidementioning

confidence: 99%

“…According to DNV/RisØ (2002), the foundation stability is usually the most decisive factor to determine foundation area, embedment depth and weight. Mohamed and Austrell (2017) noticed that the unit weight of the backfill soil has a significant influence on the foundation stability, especially when the water level is near the ground surface. Foundation sliding is unlike to be a problem for large shallow foundation although passive resistance of the surrounding soil is disregarded (Tinjum and Christensen, 2010).…”

Section: Geotechnical Design: Worldwidementioning

confidence: 99%

“…However, limited data on onshore wind turbine foundations have been published, especially in developing countries where wind energy projects have recently started. Additionally, several studies conducted onshore wind turbine foundation analysis and comparisons based on ordinary assumptions about real foundations (Horgan, 2013;Mohamed and Austrell, 2017). Several life-cycle assessments have been conducted based on limited wind turbine foundation samples (Crawford, 2009;Martínez et al, 2009;Guezuraga et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Closed-form solutions, such as the well-known Terzaghi-Meyerhof equation, are used to determine the bearing capacity (ASCE/AWEA, 2011;Ntambakwa et al, 2016). According toMohamed and Austrell (2017), the soil resistance parameters, such as friction angle and cohesion, and water level depth, have a strong effect on the allowable bearing capacity value. These authors noticed that increasing soil resistance parameters and embedment depth are a good solution to decrease the foundation area.…”

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confidence: 99%

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The shaft friction degradation of piles under cyclic axial loading in wind turbine foundations.

Nardelli¹

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Catalogação-na-publicação ACKNOWLEDGMENT I would like to express my deepest gratitude to my supervisor, Professor Marcos Massao Futai, for his encouragement and guidance during the past two years. I would like to acknowledge the committee members of this dissertation, Professor Cristina de Hollanda Cavalcanti Tsuha and Professor Marcio de Souza Soares de Almeida for their contributions. I am also very thankful to the Geotechnical Engineering Research Group (GeoInfraUSP) whose support has enabled me to grow professionally and overcome several challenges. I would like to thank all my GeoInfraUSP colleagues for their assistance and friendship. I would like to express my thanks to the Brazilian Association of Wind Energy for sharing the Brazilian wind farm statistics database. I am also very grateful to all the wind energy companies and foundation designers who actively participated in this research: Alupar,

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Section: A) Shallow Foundations: Worldwidementioning

confidence: 99%

Section: Geotechnical Design: Worldwidementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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The shaft friction degradation of piles under cyclic axial loading in wind turbine foundations.

Nardelli¹

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“…Biswas and Krishna [11] studied the effect of parameters for soil on horizontal bearing capacity of foundation embedded in nonhomogeneous soil. Based on practical projects, Mohamed and Austrell [12] analysed the effect of vertical loading and parameters for soil on horizontal bearing capacity and deformation for deep-buried foundation and shallow-buried foundation.…”

Section: Introductionmentioning

confidence: 99%

H-M Bearing Capacity of Cone-Shaped Foundation for Onshore Wind Turbine under Monotonic Horizontal Loading

Xing

Liu

et al. 2019

Advances in Materials Science and Engineering

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In this paper, monotonic horizontal loading tests were carried out to study the bearing capacity of the cone-shaped foundation in marine fine sand. With load-controlled methods, the horizontal load was applied to the rod of cone-shaped foundation at loading eccentricity ratios of 5.0, 6.0, and 7.0. In addition, theoretical analysis was used to investigate the horizontal ultimate bearing capacity, and finite element analysis was also used in this paper to investigate the influence factors of the bearing capacity of cone-shaped foundation. Based on the theoretical analysis, the formula for horizontal ultimate bearing capacity was deduced. Test results show that, at the same loading eccentricity, cone-shaped foundation can provide higher H-M bearing capacity as well as lower lateral deflection compared to regular circular foundation for wind turbines. In addition, the deflection-hardening behavior of load-deflection curve for cone-shaped foundation is also observed. Numerical analysis results show that the H-M bearing capacity of the cone-shaped foundation increases with increasing aspect ratio and buried depth, however, and decreases with increasing loading eccentricity. Based on the results from finite element analyses, several equations to calculate the maximum moment bearing capacities are put forward, which take the aspect ratio, loading eccentricity, and embedded depth into account.

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Experimental tests on shallow foundations of onshore wind turbine towers

Lago

Flessati

Marveggio

et al. 2022

Structural Concrete

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The current effort towards the progressive switch from carbon‐based to renewable energy production is leading to a relevant spreading of both on‐ and off‐shore wind turbine towers. Regarding reinforced concrete shallow foundations of onshore wind turbine steel towers, possible reductions of reinforcement may increase their sustainability, speed of erection, and competitiveness. The article presents the results of an experimental program carried out at Politecnico di Milano concerning both cyclic and monotonic loading, simulating extreme wind conditions on 1:15 scaled models of wind turbine steel towers connected by stud bolt adapters to reinforced concrete shallow foundations embedded in a sandy soil. Three couples of foundation specimens were tested with different reinforcement layouts: (a) similar to current praxis, (b) without shear reinforcement, and (c) without shear reinforcement and with 50% of ordinary steel rebars replaced by steel fibers. Additional vertical loads were added to the small‐scale models in order to ensure similarity in terms of stresses. The test results allowed to (i) characterize the mechanical behavior of the foundation element considering soil‐structure interaction under both service and ultimate load conditions, (ii) assess the foundation failure mode, (iii) highlight the role of each typology of reinforcing bars forming the cage, and (iv) provide hints for the optimization of these latter.

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A comparative study of three onshore wind turbine foundation solutions

Cited by 22 publications

References 4 publications

The shaft friction degradation of piles under cyclic axial loading in wind turbine foundations.

The shaft friction degradation of piles under cyclic axial loading in wind turbine foundations.

H-M Bearing Capacity of Cone-Shaped Foundation for Onshore Wind Turbine under Monotonic Horizontal Loading

Experimental tests on shallow foundations of onshore wind turbine towers

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