Analysis of dynamic stability of a transmission tower-line system under tilt ground motion

被引：0
|
作者：
Wei W. [1 ]
Huang G. [1 ]
Xu F. [1 ]
Hu Y. [1 ]
机构：
[1] Hubei Key Laboratory of Road Bridge and Structure Engineering, Wuhan University of Technology, Wuhan
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2022年 / 41卷 / 04期
关键词：
Dynamic stability; Incremental dynamic analysis(IDA) method; Tilting ground motion; Transmission tower-line system;
D O I：
10.13465/j.cnki.jvs.2022.04.008
中图分类号：
学科分类号：
摘要：
To explore the influence of tilting ground motion to the dynamic stability of a transmission tower-line system, the dynamic time history analysis of an actual transmission tower was carried out. Based on incremental dynamic analysis(IDA) method and the B-R criterion, the dynamic stability of the tower line system under horizontal seismic, horizontal coupled tilting and horizontal, vertical coupled tilting ground motion was analyzed. Results indicate that the rocking component and its additional second order effects of gravity produce asymmetric vibration to the transmission tower-line system, the structure has a one-way deviation from the equilibrium position, and makes the tower system more prone to dynamic instability than considering horizontal ground motion only. The influence of rocking component on the dynamic stability performance of the structure is amplified by second-order effect caused from gravity and vertical seismic response, which intensifies the dynamic instability and failure of the transmission tower-line system. When dynamic instability occurs, the weak area is mainly concentrated in the middle and lower part of the tower body, and the failure of the bar makes the local deformation of the tower body too large, leading to the whole dynamic instability of the tower-line system. © 2022, Editorial Office of Journal of Vibration and Shock. All right reserved.
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页码：55 / 62and109
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