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Seismic performance assessment of monopile-supported offshore wind turbines using unscaled natural earthquake records

De Risi, R, Bhattacharya, Subhamoy and Goda, K (2018) Seismic performance assessment of monopile-supported offshore wind turbines using unscaled natural earthquake records Soil Dynamics and Earthquake Engineering.

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The number of offshore wind turbine farms in seismic regions has been increasing globally. The seismic performance of steel monopile-supported wind turbines, which are the most popular among viable structural systems, has not been investigated thoroughly and more studies are needed to understand the potential vulnerability of these structures during extreme seismic events and to develop more reliable design and assessment procedures. This study investigates the structural performance assessment of a typical offshore wind turbine subjected to strong ground motions. Finite element models of an offshore wind turbine are developed and subjected to unscaled natural seismic records. For the first time, the sensitivity to earthquake types (i.e. crustal, inslab, and interface) and the influence of soil deformability and modeling details are investigated through cloud-based seismic fragility analysis. It is observed that monopile-supported offshore wind turbines are particularly vulnerable to extreme crustal and interface earthquakes, and the vulnerability increases when the structure is supported by soft soils. Moreover, a refined structural modeling is generally necessary to avoid overestimation of the seismic capacity of offshore wind turbines.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
Date : 2018
Copyright Disclaimer : © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Uncontrolled Keywords : Wind turbines, seismic performance, crustal earthquakes, inslab earthquakes, interface earthquakes, soil-structure interaction.
Depositing User : Melanie Hughes
Date Deposited : 14 Mar 2018 10:37
Last Modified : 14 Mar 2018 10:37

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