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

Nardelli, Andrei

doi:10.11606/d.3.2019.tde-12092019-112547

Cited by 1 publication

(2 citation statements)

References 77 publications

(347 reference statements)

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“…Root piles DFs were used in 12.6% of the cases, while 7.5% of the wind turbines had other types of foundation, such as rock anchored SFs and steel driven piles DFs. These results were significantly different from the international practice, which presents a greater share of shallow foundations [24].…”

Section: Foundationscontrasting

confidence: 77%

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Assessment of Brazilian onshore wind turbines foundations

Nardelli¹,

Futai

2022

Rev. IBRACON Estrut. Mater.

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Onshore wind turbine foundations are subjected to large overturning moments. The wind action imposes cyclic and dynamic loading conditions which occur in extreme and service scenarios. Deep foundations, when used, transfer this large overturning moment through a pile group which combines the axial and lateral resistance of all piles. The paper explored the key aspects of onshore wind turbine foundations in Brazil. The main reason to explore this subject is that several authors consider onshore wind turbine foundations a well-understood topic; however, limited data from actual situations have been published, especially in developing countries where wind energy projects have only recently started. Thus, a survey of Brazilian energy companies and foundation designers was conducted, and the first Brazilian database of wind turbine foundations was created. This database contains data from more than three thousand Brazilian wind turbine foundations. The key aspects, types and dimensions of these foundations were summarized. Worldwide, concrete gravity foundations are the most used foundation type for onshore wind turbines. In Brazil, 43.3% of wind turbines have shallow foundations, essentially concrete gravity, and 56.7% have deep foundations, mostly continuous flight auger piles. This first stage of the research identified that Brazilian wind turbine foundations are significantly different from the ones of other countries. Approximately 70% of Brazilian wind turbine deep foundations used continuous concrete flight auger piles, most of them embedded in sandy soils. Concrete and steel are the main materials used in wind turbine structures.

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Section: Foundationscontrasting

confidence: 77%

“…Overall, SFs diameter had higher correlation factors with technology status than SFs material amount. Additionally, Australian and United States wind projects exhibited similar results of concrete volume versus rated power [24].…”

Section: Shallow Foundations (Sf)mentioning

confidence: 73%