矩形钢管在输电铁塔中的应用研究

Study on the Application of Rectangular Steel Tubes in Transmission Towers

近年来,圆形钢管构件由于其全对称、体型系数小的截面特性,在特高压输电铁塔或者大跨越塔中得到了大规模的应用,但是圆截面在微风中容易引起涡激振动,微风振动在已投运线路中时有发生,个别还造成了构件的破坏。矩形构件斯托罗哈数较小,可有效改善构件的气动性能,提高构件的起振临界风速,本文通过对矩形构件的宽厚比,起振临界风速、驰振风速等方面进行计算分析,结果表明:矩形构件在不增加工程量的情况下,可大幅提高起振临界风速,可在结构的辅助构件或者隔面中应用。

In recent years,circular steel tube members have been widely used in UHV transmission towers or large-span towers because of their fully symmetrical and small shape coefficient.However,the circular section is easy to cause vortex induced vibration in the breeze,which occurs from time to time in the lines that have been put into operation,and some lines have also caused the damage of members.The small Strouhal number of rectangular members can effectively improve the aerodynamic performance of members and increase the critical wind speed of vibration.In this paper,the width thickness ratio,critical wind speed of vibration and galloping wind speed of rectangular members are calculated and analyzed.The results show that rectangular members can greatly increase the critical wind speed of vibration without increasing the weight;it can be applied in auxiliary components or diaphragm of the structure.