Seismic response analysis of offshore wind turbine in layered subsoils based on viscoelastic artificial boundary

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (3) : 291-300.

EARTHQUAKE SCIENCE AND STRUCTURE SEISMIC RESILIENCE

Seismic response analysis of offshore wind turbine in layered subsoils based on viscoelastic artificial boundary

CHEN Zhibo1,2, LIU Haibo1,2, CAO Guangwei*1,2, HE Ben3, ZENG Xuming4, PAN Shenggui4

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Abstract

In China, offshore seismic events are frequent, significantly impacting the stability of offshore wind power foundations and turbine structures. To accurately and effectively calculate the seismic dynamic response of offshore wind power structures, this study derives a formula for calculating equivalent nodal forces based on the viscoelastic artificial boundary within a three-dimensional layered soil framework, employing wave theory and Snell's Law. The accuracy of this formula is rigorously validated. Building upon this, using soil data from a wind farm site in Putian, Fujian Province, a comprehensive integrated numerical analysis model is developed. This model incorporates a 5 MW wind turbine-monopile system interacting with a layered seabed, facilitating seismic response analysis specific to offshore wind power installations. The study highlights varied responses of soil across different locations within the foundation during seismic events. Particularly, in shallow pile-soil interactions, proximity to the pile foundation correlates with reduced soil acceleration response, suggesting a restraining effect exerted by the pile foundation on soil acceleration around shallow piles. Moreover, the influence of the pile foundation on shear strain within soil layers at varying depths exhibits considerable disparity. Regarding wind turbine structures, the analysis reveals distinctive patterns: maximum displacement occurs at the tower's apex, while maximum acceleration is observed mid-tower, with peak stress concentrated in the tower's midsection.

Key words

viscous-elastic artificial boundary / equivalent nodal force / layered soil / monopile offshore wind turbine / seismic response

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CHEN Zhibo1, 2, LIU Haibo1, 2, CAO Guangwei1, 2, HE Ben3, ZENG Xuming4, PAN Shenggui4. Seismic response analysis of offshore wind turbine in layered subsoils based on viscoelastic artificial boundary[J]. Journal of Vibration and Shock, 2025, 44(3): 291-300

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