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Modal parameters of a transmission tower considering the coupling effects between the tower and lines
Engineering Structures ( IF 5.5 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.engstruct.2020.110947
Qing Zhang , Xing Fu , Liang Ren , Ziguang Jia

Abstract The modal parameters of transmission tower-line systems constitute the basis of their wind and seismic design. However, such structures become complicated spatial systems due to the coupling effects between the towers and lines, making it difficult to evaluate the modal parameters of a transmission tower. To study the tower-line coupling effects on the frequencies and mode shapes of a tower, a stochastic subspace identification (SSI) method for identifying modal parameters is first introduced. Then, a finite element model of a transmission tower-line system is established, and the influences of three transmission line parameters, namely, the total span length, span ratio and height difference angle, on the modal parameters are analyzed. An aeroelastic model of the tower-line system is fabricated, and a percussion experiment is performed. The simulated and experimental results both show that the first-order frequency increases with an increase in the total span length but is only slightly affected by changes in the span ratio and the height difference angle. For the wind and seismic design of transmission towers, to obtain reliable natural vibration characteristics, a complete tower-line system model should be established instead of a single tower model.

中文翻译:

考虑塔线耦合效应的输电塔模态参数

摘要 输电塔-线系统的模态参数是其抗风抗震设计的基础。然而,由于塔与线路之间的耦合效应,这种结构成为复杂的空间系统,使得输电塔的模态参数评估变得困难。为了研究塔线耦合对塔的频率和振型的影响,首先引入了一种用于识别模态参数的随机子空间识别(SSI)方法。然后,建立了输电塔-线系统的有限元模型,分析了输电线路总跨长、跨度比和高差角三个参数对模态参数的影响。建立了塔线系统的气动弹性模型,并进行了冲击试验。模拟和实验结果均表明,一阶频率随着总跨度长度的增加而增加,但受跨度比和高差角变化的影响很小。对于输电塔的抗风抗震设计,要获得可靠的自振特性,应建立完整的塔线系统模型,而不是单塔模型。
更新日期:2020-10-01
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