【摘要】 高压大跨越输电塔-线体系动力特性的评估是进行结构抗风抗震设计的重要环节。由于高压大跨越输电塔线之间的耦合效应,准确评估输电塔-线体系的动力特性具有相当大的难度。基于多质点模型,建立高压大跨越输电导线、输电塔以及输电塔-线体系的动力特性计算方法。该方法不仅可以计算高压大跨越输电塔线体系在平面和出平面各阶振型频率,同时也可以计算结构扭转向各阶振型频率。最后,通过分析高压大跨越输电塔在挂线和不挂线时的各阶振型频率,讨论高压大跨越输电塔-线耦合振动对输电塔动力特性的影响。分析结果表明:采用多质点模型计算得到的输电导线的各阶振型频率与连续化模型得到的结果相当,这表明该方法的准确性,而且导线对输电塔线体系动力特性的影响不可忽视。更多还原

【Abstract】 Evaluation of dynamic characteristics of high-voltage electrical transmission tower-line system is a key step for its wind resistant and seismic resistant design.The dynamic characteristic of high-voltage electrical transmission tower-line system is very difficult to be evaluated precisely because of the coupled effects between tower and lines.By using multi-degree-of-freedom model(MDOFM),a calculation method to analyze the dynamic characteristics of these structures was founded.Not only the dynamic characteristics in in-plane and out-plane direction can be evaluated,the dynamic characteristics in torsional direction can be evaluated as well.Finally through analyzing the dynamic characteristics of transmission tower with and without lines,the effects of coupled vibrations of transmission tower-line system on the dynamic characteristics of tower are discussed.Regression analysis was performed that the credibility of the method is verified by comparison of the calculation results evaluated by using MDOFM and continues model.The influence of cable to the dynamic characteristics of tower-line system are not neglected.更多还原