【摘要】 利用有限元分析软件ANSYS建立了钢管组合大跨越输电塔SZK系列的杆梁混合分析模型,采用子空间迭代法得到了结构的前5阶模态,对比以实测所得的周期近似公式,经过修正得到了该类结构的不考虑导地线影响的更加精确的第一阶周期计算公式.文章进一步考虑导地线的影响,研究不同垂直档距下输电塔的动力特性,了解了结构动力特性的变化特点,并引进考虑导地线影响的周期放大系数,修正了第一阶周期计算公式.分析研究对输电塔的抗震、抗风设计有一定参考意义.更多还原

【Abstract】 With ANSYS program of the finite element method,a new analytical-numerical model combining beam and truss elements for the structure analysis of combo steel tube tower for large crossing transmission lines is established.The initial 5 modes including vibration modes and frequencies are acquired by using subspace iteration method.After contrasting the first period between numerical theoretic and approximate formula value,the revised approximate formula for estimating the structural free vibration period under no cables is achieved which improves result accuracy.In addition,the dynamic characteristics of the tower which vary vertical span of transmission lines are analyzed and found out some available conclusions where cables are taken into account.Finally,By introducing magnifying coefficient of period for effect on cables,one valid formula considering cables effect is presented.The above research and analysis have some reference values for seismic and wind resistance design of similar transmission tower.更多还原