李悦, 谢强, 张戬, 孙启刚, 刘匀. 随机风场作用下输电塔线体系的杆件动力稳定性评估[J]. 高电压技术, 2023, 49(3): 1234-1243. DOI: 10.13336/j.1003-6520.hve.20220841
引用本文: 李悦, 谢强, 张戬, 孙启刚, 刘匀. 随机风场作用下输电塔线体系的杆件动力稳定性评估[J]. 高电压技术, 2023, 49(3): 1234-1243. DOI: 10.13336/j.1003-6520.hve.20220841
LI Yue, XIE Qiang, ZHANG Jian, SUN Qigang, LIU Yun. Dynamic Stability Assessment of Bracings in Transmission Tower-Line System Under Stochastic Wind[J]. High Voltage Engineering, 2023, 49(3): 1234-1243. DOI: 10.13336/j.1003-6520.hve.20220841
Citation: LI Yue, XIE Qiang, ZHANG Jian, SUN Qigang, LIU Yun. Dynamic Stability Assessment of Bracings in Transmission Tower-Line System Under Stochastic Wind[J]. High Voltage Engineering, 2023, 49(3): 1234-1243. DOI: 10.13336/j.1003-6520.hve.20220841

随机风场作用下输电塔线体系的杆件动力稳定性评估

Dynamic Stability Assessment of Bracings in Transmission Tower-Line System Under Stochastic Wind

  • 摘要: 输电塔中某根杆件发生失稳屈曲后,相邻杆件的应力重分布往往会导致更多的杆件失效,尽而可能引发输电塔的整体倒塌并影响整条输电线路的正常运行。因此,有必要对输电塔杆件的稳定性和承载力进行评估。为此,利用参数共振理论推导了输电塔杆件的动力失稳区和激发系数表达式,发现随着风速增大,输电塔杆件的动力失稳区缩小,最小激发系数增大,根据最小激励参数与动力失稳区之间的关系可以评估输电塔杆件的动力稳定性。在利用输电塔线体系完全气弹模型风洞试验数据进行验证后,进一步通过算例说明局部振动模态中变形较大的斜材比主材更容易发生参数共振而破坏失效。

     

    Abstract: The buckle of one or more bracings in a transmission tower leads to stress redistribution and overloads in the adjacent bracings, causing the potential collapse of a transmission tower and the normal functioning of an entire power line. Therefore, the large economic loss is inevitable in such an event, and thus it is important to properly assess transmission tower bracings. In this paper, we used the parametric resonance theory to determine the dynamic instability regions and the excitation coefficients of transmission tower bracings. The results show that the dynamic instability regions become smaller and the minimum excitation coefficients of the main and diagonal bracings become larger with the increase of mean wind. Then, the relationship between the minimum excitation parameters and the dynamic instability regions was used to assess the stability of bracings; moreover, wind tunnel test data were used to validate the analytical model. The results show that the diagonal bracings with significant deformations in local vibration modes are much more likely to undergo parametric resonance and lose bearing capacity than the main bracings.

     

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