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Author:

Cheng, Xinglei (Cheng, Xinglei.) | Cheng, Wenlong (Cheng, Wenlong.) | Wang, Piguang (Wang, Piguang.) (Scholars:王丕光) | Naggar, M. Hesham El (Naggar, M. Hesham El.) | Zhang, Jianxin (Zhang, Jianxin.) | Liu, Zhongxian (Liu, Zhongxian.)

Indexed by:

EI Scopus SCIE

Abstract:

Tripod suction buckets offer many advantages as foundations for offshore wind turbines including fast and economic installation and high overturning resistance. In this application, tripod suction buckets are subjected to dynamic loads such as wind and waves as well as earthquakes. However, their dynamic and seismic performance characteristics in cohesive soils are not well covered in the literature. This study investigates the dynamic behavior of tripod foundation installed in clay employing advanced three-dimensional nonlinear finite element analysis. Its rotation mechanism is analyzed considering different load cases including environmental loads, seismic load or combined action of seismic and environmental loads. The dynamic response was evaluated considering ground motions with varying intensity and frequency content, and environmental loads with varying magnitudes. It was found that even though the OWTs system may not experience instability failure due to the combined action of seismic and environmental loads, it is likely to fail to meet the requirements of SLS due to large permanent rotation associated with large settlement of the leeward bucket compared to that of the windward bucket. It was found that the frequency content of the ground motion has a significant effect on dynamic response of tripod foundation; larger permanent rotation can occur when the seismic predominant frequency is close to the frequency ranges of 1p and 3p for the wind turbine structure. The rotation angle of wind turbine structure depends on both the predominant frequency and intensity of the ground motion. These observations should be considered in the seismic design of tripod foundations of OWTs.

Keyword:

OWT Tripod suction bucket Clays Seismic loads Environmental loads

Author Community:

  • [ 1 ] [Cheng, Xinglei]Chengjian Univ, Key Lab Soft Soil Engn Character & Engn Environm, Tianjin, Peoples R China
  • [ 2 ] [Cheng, Wenlong]Chengjian Univ, Key Lab Soft Soil Engn Character & Engn Environm, Tianjin, Peoples R China
  • [ 3 ] [Zhang, Jianxin]Chengjian Univ, Key Lab Soft Soil Engn Character & Engn Environm, Tianjin, Peoples R China
  • [ 4 ] [Liu, Zhongxian]Chengjian Univ, Key Lab Soft Soil Engn Character & Engn Environm, Tianjin, Peoples R China
  • [ 5 ] [Wang, Piguang]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing, Peoples R China
  • [ 6 ] [Cheng, Xinglei]Western Univ, Dept Civil & Environm Engn, London, ON, Canada
  • [ 7 ] [Naggar, M. Hesham El]Western Univ, Dept Civil & Environm Engn, London, ON, Canada

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Source :

OCEAN ENGINEERING

ISSN: 0029-8018

Year: 2022

Volume: 257

5 . 0

JCR@2022

5 . 0 0 0

JCR@2022

ESI Discipline: ENGINEERING;

ESI HC Threshold:49

JCR Journal Grade:1

CAS Journal Grade:1

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 27

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 2

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