输电钢塔杆件横截面积的频率灵敏性研究

Investigation on Sensitivity of Member Cross Area to the Natural Frequency of a Steel Transmission Tower

研究了输电杆塔的杆件横截面积对自振频率的灵敏度。建立了输电杆塔的有限元模型,并建立了输电杆塔的横截面积对自振频率的灵敏度分析方法。在此基础上进行了某实际输电杆塔的参数灵敏性分析计算,并进行了细致的数值模拟和参数研究,定量研究了影响结构动力性能的关键杆件的位置和数量。结果表明输电杆塔由多根杆件所组成,不同杆件对结构安全性的影响存在差异。主材和部分斜杆的横截面积是影响结构动力特性的主要因素。而塔身斜杆的横截面积是控制输电塔扭转振动的主要因素之一。

The sensitivity of member cross area to the natural frequency of a steel transmission tower was investigated.The finite element model of a transmission tower was firstly constructed,and the sensitivity computation method of member cross area to the natural frequency was established.A real transmission tower was taken as an example to carry out the sensitivity analysis.The numerical simulation and parametric study were conducted to determine the number and position of crucial members affecting the structural dynamic properties.The experimental results indicate that a transmission tower consists of many members and their effects on structural performance are different to some extent.The cross areas of major members and some skew members are the crucial factors affecting the structural dynamic characteristics.The cross areas of skew members are the crucial factors affecting the torsional vibration.