【摘要】 苏通大跨越塔线体系塔身高、跨度长,强风下钢管中混凝土会因为受拉失效,这些原因使气动弹性模型的设计和分析变得困难。基于刚性模型的边界层风洞试验数据,采用有限元模型分别计算输电塔放松Froude数相似准则,改变输电线弹性刚度和2种变比例输电线模型对风致响应的影响,设计出苏通大跨越的气动弹性模型,进一步通过有限元模型分析钢管混凝土的材料非线性和梯度风高度对风致响应的影响。结果表明:通过增大输电线弹性刚度和采用精确的线长相似比,可以合理地设计出苏通大跨越气动弹性模型;设计风速下考虑钢管混凝土的材料非线性对风致响应影响小,考虑梯度风高度后风致响应减小。更多还原

【Abstract】 The Sutong long-span transmission tower-line system was of tall and long span, and the concrete in the steel tube may be invalidated by pull force in strong wind. These reasons made the design and analysis of its aeroelastic model difficult. Based on the data from the boundary layer wind tunnel test of a rigid model, the influences of loosening Froude number similarity criterion of transmission tower, changing the elastic stiffness of transmission line and two variable ratio transmission line models on the wind-induced responses were analyzed respectively by using the finite element model. Further, its aeroelastic model was designed. The influences of the material nonlinearity of concrete-filled steel tube and gradient wind height on the wind-induced responses were analyzed through the finite element model. The results show that by increasing the elastic stiffness of transmission lines and using the accurate line length similarity ratio, an aeroelastic model of Sutong long span can be designed reasonably; the influence of considering the material nonlinearity of concrete-filled steel tube on the wind-induced responses is small under designed wind speed, and the wind-induced responses decreases with the height of gradient wind.更多还原