Analysis on adaptability of the seawater depth for offshore wind turbine jacket foundation
Seawater depth is one of the most important factors affecting the technical and economic feasibility of offshore wind turbine jacket foundations.To investigate the technical feasibility and economic adaptability of jacket foundations for offshore wind turbines at various seawater depths,an integrated turbine-jacket-pile foundation model was established using SACS software based on three engineering projects with varying water depths.The influence of seawater depth on the jacket foundation's modal characteristics,static and fatigue responses of the upper jacket structure,downward and uplift loads on the lower pile foundation,and material quantities are analyzed.The findings indicate that:(1)Seawater depth has minimal influence on the natural vibration characteristics of the jacket structure.(2)Under ultimate load condition,the most critical structural members are located in the lower tier of the jacket foundation,and in deep water,the design control condition may change from fatigue to ultimate load conditions.(3)Horizontal loads such as wind,waves,and currents become more prominent,increasing the load-bearing proportion of the upper jacket structure.(4)While material quantities increase significantly with water depth,the rate of increase is less than that of the water depth itself.Even at a depth of 88 meters,the case study indicates that the offshore wind turbine jacket foundation is technically feasible and retains an economic advantage over current floating foundations.
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