The upsizing of the wind turbine results in increased aerodynamic thrust and pitching moment at the top of the tower,as well as a significant increase in bending moment at the base of the tower.Steel-concrete support structure becomes an effective solution for the large-scale of wind turbines.Based on the steel-concrete tower structure of a large capacity onshore wind turbine,the influence of the proportion of the concrete tower section to the steel tower section on the load and stress distribution was investigated.The results show that for large megawatt tall tower wind turbine,due to its larger tower bending moment and higher section bending mod-ulus,the frequency is close to 3P frequency range.As the proportion of concrete tower sections increases,the extreme load and fatigue load of each section of the tower increase,but the dynamic response at the hub decrea-ses and the structural stability increases.Under the extreme loads of tower structures with different proportions,both the section stiffness and load at the same height become larger.The tensile and compressive stress of con-crete decreases,and the proportion of load impact is smaller than that of structural stiffness.It concludes that both load and structural strength should be considered during design to optimize the overall structure.
Steel-concrete support structureLarge capacity wind turbineOverall frequencyStructural strength
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