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Seismic Response of Offshore Wind Turbine Supported by Monopile and Caisson Foundations in Undrained Clay

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Proceedings of the 4th International Conference on Performance Based Design in Earthquake Geotechnical Engineering (Beijing 2022) (PBD-IV 2022)

Part of the book series: Geotechnical, Geological and Earthquake Engineering ((GGEE,volume 52))

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Abstract

The seismic performance of offshore wind turbine (OWT) becomes increasingly critical as more wind farms are built/planned in sites subjected to active seismic events. Time-domain, continuum-based methods can provide comprehensive analyses of OWT during seismic shaking yet its application in engineering practice can be restricted by the complexity of soil constitutive models. This work presents a constitutive model for undrained clay that is simple yet replicates the essential soil behavior, including mechanical anisotropy, cyclic degradation of stiffness and strength, and path-dependent stiffness nonlinearity at small strains. The capacity of the soil model is assessed at various levels, by simulating soil element tests, the response of cyclically-loaded pile in centrifuge test, and the response of caisson-supported OWT in seismic centrifuge test. These assessments show that the seismic response of OWT can be reasonably represented by the proposed method. Based on the soil model, dynamic finite element analyses are performed to explore the seismic response of OWT supported by different foundation types: monopile and caisson. This investigation highlights: (1) the dynamic response of OWT foundation is governed by the kinematic-inertia interactions between soil, foundation, and superstructures; (2) the resonance of OWT structure system (including higher modes) can be a critical mechanism behind the developments of excessive foundation movements.

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Authors and Affiliations

  1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai, China

    Maosong Huang, He Cui, Zhenhao Shi & Lei Liu

  2. Department of Geotechnical Engineering, Tongji University, Shanghai, China

    Maosong Huang, He Cui, Zhenhao Shi & Lei Liu

Authors
  1. Maosong Huang
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  2. He Cui
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  3. Zhenhao Shi
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  4. Lei Liu
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Corresponding author

Correspondence to Maosong Huang .

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Editors and Affiliations

  1. Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou, China

    Lanmin Wang

  2. Department of Hydraulic Engineering, Tsinghua University, Beijing, China

    Jian-Min Zhang

  3. Department of Hydraulic Engineering, Tsinghua University, Beijing, China

    Rui Wang

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Huang, M., Cui, H., Shi, Z., Liu, L. (2022). Seismic Response of Offshore Wind Turbine Supported by Monopile and Caisson Foundations in Undrained Clay. In: Wang, L., Zhang, JM., Wang, R. (eds) Proceedings of the 4th International Conference on Performance Based Design in Earthquake Geotechnical Engineering (Beijing 2022). PBD-IV 2022. Geotechnical, Geological and Earthquake Engineering, vol 52. Springer, Cham. https://doi.org/10.1007/978-3-031-11898-2_3

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