Bending-bearing behaviour of embedded steel ring-foundation connection of onshore wind turbines

Amponsah, Evans; Wang, Zhengyu; Mantey, Selase Kwame

doi:10.1016/j.istruc.2021.07.053

Cited by 9 publications

(4 citation statements)

References 23 publications

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“…There is also extensive research related to the embedded steel ring (26) from the study of the failure mode to monitoring the degradation and cumulative damage of the compressive zone of the concrete (27) and strengthening systems to improve the fatigue life of the foundation (28).…”

Section: Life Extensionmentioning

confidence: 99%

Foundations of onshore Wind turbines: current situation and trends

Jiménez Toña,

Cuadrado Rojo,

Rojí Chandro

2024

Inf. constr.

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The commitments by the governments for the net zero emissions for the coming decades will be a huge challenge for the renewable sector all over the planet. Wind energy will play a significant role in this transition and scale-up, in both offshore and onshore, is a crucial step to move forward. The quick development of the new onshore wind turbine models in the race for the most powerful machine, the gradual increase in the hub height, and the unitary power of the new onshore wind turbines are producing modifications in different components of the turbines. This work presents a review of the onshore wind turbines foundations, especially about the different foundation design concepts available in the onshore business, the analysis of some of them and the trends.

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Section: Life Extensionmentioning

confidence: 99%

Foundations of onshore Wind turbines: current situation and trends

Jiménez Toña,

Cuadrado Rojo,

Rojí Chandro

2024

Inf. constr.

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“…They found that turbulence intensity and wave load uncertainty significantly influence fatigue load uncertainty, while soil property uncertainties exhibit nonlinear or interactive behavior. Amponsah et al [7] proposed an analytical expression for the ultimate bending moment bearing capacity based on stress distribution and failure mode under observed ultimate loads for embedded steel ring-foundation connections. McAlorum et al [8] employed an ultra-long fiber optic strain sensor to monitor crack development and changes in foundation concrete over time.…”

Section: Introductionmentioning

confidence: 99%

Predicting the Displacement Variation of Rehabilitated Foundation of Onshore Wind Turbines Using Machine Learning Models

Zheng,

Liu,

Gao

et al. 2024

Buildings

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The rehabilitation of wind turbine foundations after damage is increasingly common. However, limited research exists on the deformation of wind turbine foundations after rehabilitation. Artificial intelligence methods can be used to analyze future deformation state and predict post-rehabilitation deformation of foundations. This paper focuses on analyzing the stability of damaged wind turbine foundations after rehabilitation, as well as establishing and evaluating machine learning models. Specifically, Decision Tree (DT), Extreme Gradient Boosting (XGB), Support Vector Regression (SVR), and Long Short-Term Memory Network (LSTM) models are utilized to predict the vertical displacement of the rehabilitated foundation. Hence, the stability of the rehabilitated foundation is discussed in correlation with the measured wind speed, based on the foundation vertical displacement data. During the development of the machine learning model, the most suitable combination of hyperparameters is determined. The prediction performance of the SVR and LSTM models, which exhibit good performance, is compared to further evaluate their effectiveness. Furthermore, the models are analyzed and validated. The results indicate that the vertical displacements of the rehabilitated foundations gradually get close to a state of steady fluctuation over time. The SVR model is identified as the most effective in predicting the vertical displacements of wind turbine foundations after rehabilitation. This study aims to analyze and predict the vertical displacement of wind turbine foundations after rehabilitation based on extensive field monitoring data and powerful machine learning models.

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“…A 3‐dimensional (3D) numerical modelling was applied to four foundation solutions for wind turbine subjected to realistic static loading, by which method the cases of a shallow foundation and a pile foundation were investigated. Furthermore, numerical analysis and experimental method were carried out to explore the flexural performance of embedded steel ring‐foundation connection of onshore wind turbines [10, 11].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, numerical analysis and experimental method were carried out to explore the flexural performance of embedded steel ring-foundation connection of onshore wind turbines [10,11].…”

Section: Introductionmentioning

confidence: 99%

Research on the strengthening and retrofitting methods of existing wind turbine foundations with embedded‐ring

Wang,

Gao,

Qiu

et al. 2023

IET Renewable Power Gen

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Higher demand for the load‐bearing ability of supporting foundations is required if its upper wind turbine is substituted by a larger one. Presently, there is a lack of strengthening and retrofitting methods for existing wind turbine foundations. A combined‐connection retrofitting method by adding anchor bolts to the existing wind turbine foundation with embedded‐ring is prompted in this study. Furthermore, a strengthening measure by adding a stiffening beam, expanding the foundation plate, and adding rock bolts to increase the ability to resist basal bending moment is proposed. Finite element analysis is conducted to analyze the effectiveness of the proposed strengthening and retrofitting methods for a 2 MW wind turbine foundation. The result shows that the peak stress of embedded‐ring is decreased by 36% by using the internal combined‐connection, and the peak tensile stress of concrete is reduced by 4.0%. When the external combined‐connection is adopted, the peak stress of the embedded‐ring is reduced by 69.3%, and the peak tensile stress of the concrete is reduced by 26.0%. It illustrates that the external combined‐connection method is more effective to increase the load‐bearing capability of the connection than the internal combined‐connection method. Additionally, the proposed strengthening measure by adding a stiffening beam, expanding the foundation plate, and adding rock bolts is effective to decrease the responses of foundation. The maximum tensile stress of concrete, the maximum compressive stress of concrete, and the maximum stress of the embedded‐ring are reduced by 19.8%, 31.3%, and 22.2%, respectively. To summarize, the proposed strengthening and retrofitting methods are capable of ensuring the safety and stability of higher‐power wind turbine operation.

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Bending-bearing behaviour of embedded steel ring-foundation connection of onshore wind turbines

Cited by 9 publications

References 23 publications

Foundations of onshore Wind turbines: current situation and trends

Foundations of onshore Wind turbines: current situation and trends

Predicting the Displacement Variation of Rehabilitated Foundation of Onshore Wind Turbines Using Machine Learning Models

Research on the strengthening and retrofitting methods of existing wind turbine foundations with embedded‐ring

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