Geotechnical Design Considerations for Onshore Wind Turbine Shallow Foundations

Ntambakwa, Eric; Yu, Haohui; Guzmán, Carlos E; Rogers, Matthew

doi:10.1061/9780784479742.096

Cited by 6 publications

(15 citation statements)

References 6 publications

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“…Typically, gravity foundations have a diameter between 12 and 20 m, central pedestal diameter of 4.5 to 5.5 m, thickness of 0.7 m at the edge and 2.5 to 3.5 m at the center, embedment of 2.4 to 3.5 m beneath the ground level, content of 120 to 460 cubic meters of concrete and 125 to 360 kN of reinforcing steel (Tinjum and Christensen, 2010;Lang, 2012;Berndt, 2015;Ntambakwa et al, 2016). The water table level also plays an important role in the foundation characteristics.…”

Section: A) Shallow Foundations: Worldwidementioning

confidence: 99%

“…The foundation stiffness which depends on the soil-foundation-structure interaction is crucial for predicting the dynamic structural response (DNV/RisØ, 2002;Ntambakwa et al, 2016).…”

Section: Geotechnical Design: Worldwidementioning

confidence: 99%

“…Additionally, a "no gapping" verification under operational loads is often performed to ensure adequate foundation stiffness and limit cyclic loading which can contribute to cyclic degradation of supporting soils (ASCE/AWEA, 2011; Ntambakwa et al, 2016). The wind turbine manufacturers usually specify a minimum value of foundation rotational stiffness (ASCE/AWEA, 2011).…”

Section: Geotechnical Design: Worldwidementioning

confidence: 99%

“…Short-term recoverable elastic, long-term plastic and consolidation, and differential settlements should be addressed (Morgan and Ntambakwa, 2008). Typically, the total settlement of granular soils is based on the application of extreme loads, while the settlement of fine soils is based on the elastic and long-term consolidation settlement under operational loads (Ntambakwa et al, 2016). The maximum differential settlement is usually on the order of 3.0 mm/m to 4.5 mm/m (Ntambakwa et al, 2016).…”

Section: Geotechnical Design: Worldwidementioning

confidence: 99%

“…Typically, the total settlement of granular soils is based on the application of extreme loads, while the settlement of fine soils is based on the elastic and long-term consolidation settlement under operational loads (Ntambakwa et al, 2016). The maximum differential settlement is usually on the order of 3.0 mm/m to 4.5 mm/m (Ntambakwa et al, 2016). In the absence of specified limits, a maximum inclination of 3.0 mm/m is recommended (ASCE/AWEA, 2011).…”

Section: Geotechnical Design: Worldwidementioning

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%

“…The foundation stiffness which depends on the soil-foundation-structure interaction is crucial for predicting the dynamic structural response (DNV/RisØ, 2002;Ntambakwa et al, 2016).…”

Section: Geotechnical Design: Worldwidementioning

confidence: 99%

Section: Geotechnical Design: Worldwidementioning

confidence: 99%

Section: Geotechnical Design: Worldwidementioning

confidence: 99%

Section: Geotechnical Design: Worldwidementioning

confidence: 99%

See 3 more Smart Citations

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

Nardelli¹

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Influence of soil‐structure interaction on the behavior of the tower‐foundation system of a horizontal‐axis wind turbine

Medeiros,

Bello,

de Lima

2024

Structural Design Tall Build

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The ongoing advancement of wind turbines, aiming for taller towers to harness more intense winds, poses substantial structural challenges. Soil‐structure interaction (SSI) assumes fundamental importance, necessitating precise analysis, and mathematical modeling. This study focuses on examining how SSI influences horizontal‐axis wind turbine tower‐foundation systems. Six numerical models, varying from simplified to more complex representations, are created using the finite element method (FEM) in ANSYS software. The analysis reveals significant sensitivity to support conditions, particularly elastic supports, causing the greatest displacement at the tower's top (1.899 m), highlighting the substantial influence of SSI and second‐order effects. Incorporating SSI and second‐order effects results in a 30.11% increase in von Mises stress at the base flange (73.4 MPa), compared to models excluding these factors. Stress variation along the tower height notably increases with second‐order effects; however, the structure maintains a 13.32% safety margin relative to steel load‐bearing capacity. Foundation analyses indicate stresses exceeding concrete's allowable stress by 24.3%, underscoring the need for foundation optimization. These results stress the importance of considering SSI and geometric nonlinearity for wind turbine development. The lack of comparable studies in literature underscores the significance of this research in advancing the field's knowledge.

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Bearing Capacity of Shallow Footings Reinforced with Braid and Geogrid Adjacent to Soil Slope

Satvati

Alimohammadi

Rowshanzamir

et al. 2020

Int. J. of Geosynth. and Ground Eng.

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One of the common features used for improving the bearing capacity of footings adjacent to a soil slope is reinforcement by geosynthetics. These elements may somehow isolate the soil inside of the geosynthetic and eliminate shear-stress mobilization. In this study, a new kind of three-dimensional geosynthetics called expandable braided sleeve (braid) and geogrid have used a laboratory modeling approach to investigate the effects of different variables on the bearing capacity of footings on soil slopes. Some parameters, including relative density and soil compaction, were assumed constant in all tests. In contrast, other variable parameters, including the vertical distance between the surface and the first layer of geosynthetics, the distance of a footing from the slope edge, and planar and tabular shapes of braid and geogrid were investigated. Results demonstrated that for the same conditions of some parameters, cylindrical reinforcement has a more significant effect than the planar form of the reinforcement concerning enhancing bearing capacity and settlement reduction. Inclusion of geosynthetic reinforcement can also reduce stress concentration and distribute the applied load, resulting in settlement reduction. Moreover, braid material was found to result in somehow better performance than geogrids in reducing settlement.

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Geotechnical Design Considerations for Onshore Wind Turbine Shallow Foundations

Cited by 6 publications

References 6 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.

Influence of soil‐structure interaction on the behavior of the tower‐foundation system of a horizontal‐axis wind turbine

Bearing Capacity of Shallow Footings Reinforced with Braid and Geogrid Adjacent to Soil Slope

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