Abstract
Concrete foundations have received attention as offshore wind turbine support structures because of their various advantages. However, because of the lack of information on structural analysis and the design method of complex marine environmental loads, concrete foundations cannot be applied on actual sites. Therefore, the structure behavior mechanism and concrete reinforcement design need to be evaluated based on soil-structure interactions. Herein, an efficient method for analysis of piled concrete foundations (PCFs) is presented, and the stability of PCF structures is evaluated under environmental conditions of the coast in Korea for a 3-MW wind turbine. Three analytical parameters for PCF models were defined to consider soil-structure interaction. The results of each model were compared with the displacement, stresses, and natural frequencies. Using the analysis results, a prestressing reinforcement design for concrete foundations was proposed. Quasi-static analysis showed that maximum displacement was sufficiently small and the maximum stresses did not exceed the allowable stresses. PCF showed excellent dynamic performance and structural stability. In addition, stiffness of the soil spring model influenced the natural frequency rather than the stiffness of the pile type. Detailed analysis of the connections between piles and concrete need to be studied in the future.
Highlights
The amount of offshore wind energy has recently increased across the globe as one of the renewable energy sources
The Korean Government has started to invest in the offshore wind turbine industry and will move forward with projects to develop offshore wind farms in Korea
Oh et al [2,3] studied the feasibility of the offshore wind resources around the Korean Peninsula for a 100-MW class offshore wind farm and performed an assessment of the wind energy potential at a demonstration site in Korea to estimate the economic benefits and establish reliable design criteria
Summary
The amount of offshore wind energy has recently increased across the globe as one of the renewable energy sources. Oh et al [5] preliminarily evaluated the offshore wind turbine monopile foundation dimensions based on the site conditions near the island Wi-do in the West Sea of Korea by considering aerodynamic loads and hydrodynamic loads. They presented foundation design methods and optimal dimensions of the monopile foundation for the selected site. An efficient method for the analysis of a piled concrete foundation (PCF) is presented, and the stability of the PCF structure is evaluated under the environmental conditions of the coast near the Jaeun island in Jeonnam-do of Korea. The study aims to provide an efficient analysis method and prestressing reinforcement design method through analysis results of piled concrete foundations for offshore wind turbines and present design references for the future
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