Directional Bending Performance of 4-Leg Jacket Substructure Supporting a 3MW Offshore Wind Turbine

Thanh-Tuan Tran, Sangkyun Kang, Jang-Ho Lee and Daeyong Lee
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Thanh-Tuan Tran: Institute of Offshore Wind Energy, Kunsan National University, 558 Daehak-ro, Gunsan-City 54150, Jeollabuk-do, Korea
Sangkyun Kang: Department of Mechanical Engineering, Kunsan National University, 558 Daehak-ro, Gunsan-City 54150, Jeollabuk-do, Korea
Jang-Ho Lee: Department of Mechanical Engineering, Kunsan National University, 558 Daehak-ro, Gunsan-City 54150, Jeollabuk-do, Korea
Daeyong Lee: Institute of Offshore Wind Energy, Kunsan National University, 558 Daehak-ro, Gunsan-City 54150, Jeollabuk-do, Korea

Energies, 2021, vol. 14, issue 9, 1-17

Abstract: A comprehensive investigation of the directional bending performance of a 4-leg jacket substructure, supporting a 3 MW offshore wind turbine, has been carried out in this study. The jacket substructure with a Pratt bracing system which is already installed in the southwest offshore wind farm in South Korea has been chosen as a reference support structure. A numerical model of the 3MW support structure (i.e., tower, transition piece, and jacket structure) is configured, and its structural performances are evaluated under the conditions of (1) extreme environmental loads (Env), (2) critical Design Load Cases (DLCs), and (3) a total of 288 combined load cases (CBs). For the case of Env (i.e., wind, wave, and current loads), loading directions varying from 0° to 360° at intervals of 15° are considered. The DLCs are provided from the 3 MW wind turbine manufacturer, in a 6 × 12 matrix format. The selected 4-leg jacket substructure in this study showed the smallest bending stiffness at the loading angles of 135° and 315° under the condition of Env, and at the loading angles between 105° and 150° under the CBs. From these results, critical bending directionality of the 4-leg jacket substructure is identified. This study also found that the effects of Env loads are not small compared to the total structural responses of the 4-leg jacket substructure which is supporting a 3 MW offshore wind turbine.

Keywords: offshore wind turbine; jacket substructure; Pratt bracing system; modal analysis; polar diagram; environmental loads; Design Load Cases (DLC); percentage contribution; critical directionality (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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