Abstract

Increased demand for renewable energy production has stimulated interest in the offshore wind turbine (OWT) industry as a viable solution, and with OWTs growing larger in scale, further research is required into the dynamics of these newer structures. The majority of installed OWTs to date are built upon monopile foundations, and it is widely acknowledged that the current design methods for offshore piles are not appropriate for the large diameter piles required. This paper uses a novel pile-soil gapping algorithm to simulate the effects of
degradation to the soil conditions in the sea bed. Using a 1D Winkler beam spring approach, a dynamic model is validated for prediction of the natural frequencies of several OWT case studies, and the gapping algorithm is shown to reproduce well the reduction in natural frequency likely attributed to soil degradation measured from an OWT in Kentish Flats wind farm. It is found through the simulation of rotor-stop tests that the presence of gapping decreases the measured natural frequency, and this effect is greater for the monopile foundations with a smaller slenderness ratio.
Original languageEnglish
Pages5005-5014
Number of pages10
Publication statusPublished - 28 Jun 2021
Event8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering - Athens, Greece
Duration: 28 Jun 202130 Jun 2021
https://2021.compdyn.org/

Conference

Conference8th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering
Abbreviated titleCOMPDYN 2021
Country/TerritoryGreece
CityAthens
Period28/06/2130/06/21
Internet address

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