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Model Test and Numerical Analysis of a Multi-pile Offshore Wind Turbine under Seismic, Wind, Wave and Current Loads

[+] Author and Article Information
Wenhua Wang

State Key Laboratory of Costal and Offshore Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, ChinaInstitute of Earthquake Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China
wenhua.wang@ntnu.no

Zhen Gao

Centre for Autonomous Marine Operations and Systems, Department of Marine Technology, Norwegian University of Science and Technology, Trondheim 7491, Norway
zhen.gao@ntnu.no

Xin Li

State Key Laboratory of Costal and Offshore Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, ChinaInstitute of Earthquake Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China
lixin@dlut.edu.cn

Torgeir Moan

Centre for Autonomous Marine Operations and Systems, Department of Marine Technology, Norwegian University of Science and Technology, Trondheim 7491, Norway
Torgeir.Moan@ntnu.no

1Corresponding author.

ASME doi:10.1115/1.4035305 History: Received April 05, 2016; Revised November 15, 2016

Abstract

Offshore wind turbines (OWTs) might be subjected to seismic loads with different peak accelerations during operation in the actively seismic regions. The earthquakes might be a potential risk for the OWTs due to its characteristic of stochastic. Earthquake with wind and wave could act on OWT at the same time, thus, the structural responses of such OWTs should be analyzed in consideration of reasonable load combinations. Based on the hydro-elastic similarity, an integrated model of the combined NREL 5MW wind turbine and a practical pentapod substructure is designed. The governing equations of motion of the integrated OWT are established. The dynamic tests and numerical analysis of the OWT model are performed under combinations of seismic, wind and sea load conditions. The El Centro and API-based synthesized seismic waves with different peak ground accelerations (PGAs) are considered in this study. The numerical results are in good agreement with the experimental ones. The coupling effect of the OWT structure under the combined load conditions is demonstrated from the experimental and numerical results. The results indicate that the interaction of earthquake, wind, wave and current should be taken into account in order to obtain proper structural response, especially with small PGA.

Copyright (c) 2016 by ASME
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