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钢管塔在我国特高压输电线路中得到广泛应用.但钢管塔的部分圆截面构件在较低风速时容易发生横风向振动,需要在结构设计中合理确定其起振临界风速以有效地减少这一振动.本文结合1 000 kV淮南-上海(皖电东送)输变电工程,对不同型式插板连接钢管构件的杆端约束条件和起振临界风速分别进行了自振频率和风洞试验的测试研究,并与振动理论分析结果进行了比较.在此基础上,结合以往研究成果,提出了钢管塔微风振动构件起振临界风速较为全面的计算方法.
Steel pipe towers are widely used in UHV transmission lines in China, but some circular cross-section members of steel pipe towers are prone to transverse wind vibration when the wind speed is low, and the critical wind speed needs to be determined reasonably in structural design to effectively reduce this Vibration.In this paper, 1 000 kV Huainan-Shanghai (East Anhui Power Transmission and Transformation) transmission and distribution project, different types of flapper connection steel pipe member of the rod-end constraints and the threshold frequency of vibration were conducted by natural frequency and wind tunnel test Based on the above research results, a more comprehensive calculation method for the critical wind speed of the bimodal vibrating members of the steel pipe tower is put forward.