Dynamic Impedance of the Wide-Shallow Bucket Foundation for Offshore Wind Turbine Using Coupled Finite–Infinite Element Method

The dynamic impedances of foundation play an important role in the dynamic behavior and structural stability of offshore wind turbines (OWT). Though the behaviors of bucket foundation, which are considered as a relatively innovative foundation type under static loading, have been extensively investi...

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Published inEnergies (Basel) Vol. 12; no. 22; p. 4370
Main Authors Lian, Jijian, Jiang, Qi, Dong, Xiaofeng, Zhao, Yue, Zhao, Hao
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 16.11.2019
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ISSN1996-1073
1996-1073
DOI10.3390/en12224370

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Abstract The dynamic impedances of foundation play an important role in the dynamic behavior and structural stability of offshore wind turbines (OWT). Though the behaviors of bucket foundation, which are considered as a relatively innovative foundation type under static loading, have been extensively investigated, the corresponding dynamic performances were neglected in previous research. This study focuses on the dynamic impedances of wide-shallow bucket foundations (WSBF) under the horizontal and rocking loads. Firstly, the numerical model was established to obtain the dynamic impedances of WSBF using the coupled finite-infinite element technique (FE-IFE). The crucial parameters affecting the dynamic responses of WSBF are investigated. It is shown that the skirt length mainly affects the rocking dynamic impedance and the diameter significantly affects the horizontal and coupling impedances, especially when the diameter is larger than 34 m. The overall dynamic responses of WSBF are profoundly affected by the relative soil thickness and the multi-layer soil stiffness. Additionally, dynamic impedances of WSBF are insensitive to the homogeneous soil stiffness. Lastly, the safety threshold curve was calculated according to the OWT, which can provide essential reference for the design of the OWT supported by large scale WSBF.
AbstractList The dynamic impedances of foundation play an important role in the dynamic behavior and structural stability of offshore wind turbines (OWT). Though the behaviors of bucket foundation, which are considered as a relatively innovative foundation type under static loading, have been extensively investigated, the corresponding dynamic performances were neglected in previous research. This study focuses on the dynamic impedances of wide-shallow bucket foundations (WSBF) under the horizontal and rocking loads. Firstly, the numerical model was established to obtain the dynamic impedances of WSBF using the coupled finite-infinite element technique (FE-IFE). The crucial parameters affecting the dynamic responses of WSBF are investigated. It is shown that the skirt length mainly affects the rocking dynamic impedance and the diameter significantly affects the horizontal and coupling impedances, especially when the diameter is larger than 34 m. The overall dynamic responses of WSBF are profoundly affected by the relative soil thickness and the multi-layer soil stiffness. Additionally, dynamic impedances of WSBF are insensitive to the homogeneous soil stiffness. Lastly, the safety threshold curve was calculated according to the OWT, which can provide essential reference for the design of the OWT supported by large scale WSBF.
[...]the dynamic impedances of WSBF are obtained by performing steady state dynamic response analysis subjected to harmonic excitation in the frequency domain. [...]the maximum of the size of the elements size should meet the following requirement [46]: lmax≤(18~15)2πRa where a=ωR/cs is the dimensionless frequency, ω , R and cs are respectively the frequency, the foundation radius, and the shear wave velocity of the soil. [...]in order to minimize the error induced by numerical shock and coupling boundaries, the requirement of the near field domain modeled by the finite element can be expressed as: lr≥2mπRa2−2v1−2v where lr represents the minimum reflection length of finite element. m is the cycle number of excitations. v is Poisson’s ratio of the surrounding soil. 3.2. According to the established WSBF and integrated transportation requirements, the diameter of foundation selected in the numerical analysis varies from 30 m to 45 m (cases 3,5–7), and the skirt length from 3 m to 20 m (cases 1–4) based on the water depth. [...]the results show that the relative soil layer thickness is the dominant factor affecting the dynamic impedances of the WSBF. 4.4.
Author Lian, Jijian
Dong, Xiaofeng
Zhao, Yue
Jiang, Qi
Zhao, Hao
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Snippet The dynamic impedances of foundation play an important role in the dynamic behavior and structural stability of offshore wind turbines (OWT). Though the...
[...]the dynamic impedances of WSBF are obtained by performing steady state dynamic response analysis subjected to harmonic excitation in the frequency domain....
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StartPage 4370
SubjectTerms Accuracy
Civil engineering
coupled finite-infinite element technique
dynamic impedance
Finite element analysis
numerical modelling
offshore wind turbine
Turbines
wide-shallow bucket foundation
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Title Dynamic Impedance of the Wide-Shallow Bucket Foundation for Offshore Wind Turbine Using Coupled Finite–Infinite Element Method
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