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Sensitivity of Seabed Characteristics on the Seismic Performance of Suction Bucket-Supported Offshore Wind Turbines

Author

Listed:
  • Duc-Vu Ngo

    (Department of Ocean Science and Engineering, Kunsan National University, Gunsan 54150, Republic of Korea)

  • Dong-Hyawn Kim

    (Department of Coastal Construction Engineering, Kunsan National University, Gunsan 54150, Republic of Korea)

Abstract

The suction bucket foundation equipped for offshore wind turbines was a promising solution for sandy seabed locations. However, its typically short embedment depth presented additional challenges when installed in seismic zones. These challenges pertained not only to structural response but also to the seismic motion itself, which was strongly influenced by soil characteristics. This study examined the uncertainty of equivalent shear-wave velocities to explore the variability in input seismic motion characteristics and investigated their impact on the structural response in terms of tower-top displacement, mudline displacement, and acceleration amplification factor at the hub height of 3 MW and 5.5 MW suction bucket-supported offshore wind turbines (OWTs). Additionally, the influence of equivalent shear-wave velocities on the exceedance probabilities of various damage states, using fragility curves for tower-top and mudline displacement, was analyzed. The results indicated that equivalent shear velocities of soil significantly impacted the seismic performance of suction bucket-supported offshore wind turbines. These effects were closely related to the intensity of the seismic motion, highlighting the importance of carefully considering the correlation between site-specific shear velocities and earthquake intensities.

Suggested Citation

  • Duc-Vu Ngo & Dong-Hyawn Kim, 2024. "Sensitivity of Seabed Characteristics on the Seismic Performance of Suction Bucket-Supported Offshore Wind Turbines," Sustainability, MDPI, vol. 16(21), pages 1-19, October.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:21:p:9150-:d:1503904
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    References listed on IDEAS

    as
    1. Wang, Xuefei & Yang, Xu & Zeng, Xiangwu, 2017. "Seismic centrifuge modelling of suction bucket foundation for offshore wind turbine," Renewable Energy, Elsevier, vol. 114(PB), pages 1013-1022.
    2. Rezaei, Ramtin & Fromme, Paul & Duffour, Philippe, 2018. "Fatigue life sensitivity of monopile-supported offshore wind turbines to damping," Renewable Energy, Elsevier, vol. 123(C), pages 450-459.
    3. Kim, Dong Hyawn & Lee, Sang Geun & Lee, Il Keun, 2014. "Seismic fragility analysis of 5 MW offshore wind turbine," Renewable Energy, Elsevier, vol. 65(C), pages 250-256.
    4. Negro, Vicente & López-Gutiérrez, José-Santos & Esteban, M. Dolores & Matutano, Clara, 2014. "Uncertainties in the design of support structures and foundations for offshore wind turbines," Renewable Energy, Elsevier, vol. 63(C), pages 125-132.
    5. Duc-Vu Ngo & Young-Jin Kim & Dong-Hyawn Kim, 2023. "Risk Assessment of Offshore Wind Turbines Suction Bucket Foundation Subject to Multi-Hazard Events," Energies, MDPI, vol. 16(5), pages 1-13, February.
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