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http://dx.doi.org/10.12814/jkgss.2014.13.4.021

Effect of Foundation Flexibility of Offshore Wind Turbine on Force and Movement at Monopile Head  

Jung, Sungmoon (Department of Civil and Environmental Engineering, Florida A&M)
Kim, Sung-Ryul (Department of Civil Engineering, Dong-A University)
Lee, Juhyung (Geotechnical Engineering Research Division, KICT)
Le, Chi Hung (Department of Civil Engineering, Dong-A University)
Publication Information
Journal of the Korean Geosynthetics Society / v.13, no.4, 2014 , pp. 21-31 More about this Journal
Abstract
Recently, the research on renewable energy against depletion of fossil fuel have been actively carried out in the world. Especially, offshore wind turbines are very economical and innovative technology. However, offshore wind turbines experience large base moments due to the wind and wave loading, so the monopile with large diameter needs to be applied. For the economical design of the large diameter pile, it is important to consider the flexibility of the foundation to estimate the maximum moment accurately, based on studies conducted so far. In this paper, the foundation was modeled using the finite element method in order to better describe the large diameter effect of a monopile and the results were compared with those of p-y method. For the examples studied in this paper, the change in maximum moment was insignificant, but the maximum tilt angle from the finite element method was over 14% larger than that of p-y method. Therefore, the finite element approach is recommended to model the flexibility effect of the pile when large tilt angles may cause serviceability issues.
Keywords
Offshore wind turbine; Foundation; Coupled spring model; Natural frequency; Foundation flexibility;
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