말뚝-지반 상호작용을 고려한 해상풍력 모노파일 지지구조물의 구조거동 분석
Structural Behavior Analysis of Offshore Wind Support Structure with Monopile Considering Pile-Soil Interaction
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초록
Although monopiles for wind turbines are mostly used worldwide due to cost efficiency and simple construction, it has not been applied to the seabed around Korea. However, as heavy machines for offshore structure installation have recently been improved, the application of a monopile foundation is being tried. Unlike in Europe, most offshore piles are conventionally penetrated into good rock without a clear background and standards in Korea, and the design of a wind turbine monopile in the Korean seabed hasn’t been undertaken. For this reason, this study dealt with the structural analysis of offshore XL (very large) monopiles for a 5.5 MW wind turbine considering pile-soil interaction in the Korean seabed. Structural behaviors of monopiles were numerically investigated for several penetration depths and load conditions using frame-spring models. The results show that the monopile can provide sufficient bearing capacity and good serviceability when its tip is penetrated into weak rock, while other cases do not satisfy serviceability due to excessive lateral displacements at the end.
Abstract
Although monopiles for wind turbines are mostly used worldwide due to cost efficiency and simple construction, it has not been applied to the seabed around Korea. However, as heavy machines for offshore structure installation have recently been improved, the application of a monopile foundation is being tried. Unlike in Europe, most offshore piles are conventionally penetrated into good rock without a clear background and standards in Korea, and the design of a wind turbine monopile in the Korean seabed hasn’t been undertaken. For this reason, this study dealt with the structural analysis of offshore XL (very large) monopiles for a 5.5 MW wind turbine considering pile-soil interaction in the Korean seabed. Structural behaviors of monopiles were numerically investigated for several penetration depths and load conditions using frame-spring models. The results show that the monopile can provide sufficient bearing capacity and good serviceability when its tip is penetrated into weak rock, while other cases do not satisfy serviceability due to excessive lateral displacements at the end.
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