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http://dx.doi.org/10.7781/kjoss.2013.25.3.307

New Development of Hybrid Concrete Support Structure with Driven Piles for Offshore Wind Turbines  

Kim, Hyun Gi (Dept. of Civil and Environmental System Engineering, Konkuk University)
Kim, Bum Jun (Dept. of Civil and Environmental System Engineering, Konkuk University)
Kim, Ki Du (Dept. of Civil and Environmental System Engineering, Konkuk University)
Publication Information
Journal of Korean Society of Steel Construction / v.25, no.3, 2013 , pp. 307-320 More about this Journal
Abstract
This paper proposes a new hybrid support structure by the driven piles which removes disadvantages of the existing type of support structure for offshore wind turbines. The hybrid type of support structure is combined with concrete cone and steel shaft, and is supported not only by gravity type foundations but also by driven piles. For three dimensional analysis of the huge and thick concrete structure, a solid-shell element that is capable of exact modeling and node interpolations of stresses is developed. By applying wave theory of stream function and solid-shell element in XSEA simulation software for fixed offshore wind turbines, a quasi-static analysis and natural frequency analysis of proposed support structure are performed with the environmental condition on Southwest Coast in Korea. In the result, lateral displacement is not exceed allowable displacement and a superiority of dynamic behavior of new hybrid support structure is validated by natural frequency analysis. Consequently, the hybrid support structure presented in this study has a structural stability enough to be applied on real-site condition in Korea. The optimized structures based on the preliminary design concept resulted in an efficient structure, which reasonably reduces fabrication costs.
Keywords
multi-pile concrete foundation; hybrid support structure; solid-shell; finite element analysis; wave theory;
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