Abstract
Scour risk assessment considering reaction force at foundation was proposed and applied to newly developed pentapod suction bucket support structures for a 5.5 MW offshore wind turbine under ultimate limit state environmental load. Scour hazard was obtained according to scour depth by using an empirical formula, which is the function of marine environmental conditions such as significant wave height, significant period, and current velocity. Fragility of the pentapod support structure was evaluated using the bearing capacity limit state criterion under ultimate limit state load case. Scour risk was assessed by combining the scour hazard and the fragility. Finally, scour risk of the developed pentapod suction bucket support structure under ultimate limit state has been assessed.
Highlights
Suction Bucket (SB) is a highly competitive foundation solution among the several types of foundations currently implemented to support offshore wind turbines (OWT)due to their quick and noise-free installation
Latini and Zania, 2017 [2] investigated the dynamic behavior of SB and concluded that the skirt length of a SB is an important parameter that determines the dynamic behavior, and the horizontal bearing capacity is greatly affected by the ratio of the bucket diameter and length
When existing SB support structures are installed in area where the geological structure is a shallow soft-layer soil on top of a hard-layer soil, there is a problem that the SB diameter must be abnormally large to fulfill the required bearing capacity
Summary
Suction Bucket (SB) is a highly competitive foundation solution among the several types of foundations currently implemented to support offshore wind turbines (OWT). A study that evaluated a reliabilitybased probabilistic of the wave-induced scour depth around marine structure piles was performed by Homaei et al [17]; they developed a probabilistic model by using an artificial intelligence method so as to predict the scour depth at pile groups under regular waves. These studies were conducted on monopiles, and the risk of scouring could not be evaluated quantitatively. A scour risk analysis was performed to evaluate the stability of the newly developed PSB support structure at an ultimate limit state. Numerical analysis and conclusions are described in turn
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