Dynamic Failure Mode Analysis for a Transmission Tower-Line System Induced by Strong Winds

Shizeng Liu, Wentong Zhang (), Qiang Li, Shicheng Yan, Shihong Zhang, Chao Li and Lixiao Li
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Shizeng Liu: Dali Bureau of EHV Power Transmission Company, China Southern Power Grid International, Dali 671014, China
Wentong Zhang: School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523000, China
Qiang Li: Dali Bureau of EHV Power Transmission Company, China Southern Power Grid International, Dali 671014, China
Shicheng Yan: Dali Bureau of EHV Power Transmission Company, China Southern Power Grid International, Dali 671014, China
Shihong Zhang: Dali Bureau of EHV Power Transmission Company, China Southern Power Grid International, Dali 671014, China
Chao Li: School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen 518055, China
Lixiao Li: College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518055, China

Energies, 2024, vol. 17, issue 18, 1-20

Abstract: The prevailing approach to the wind resistance design of transmission towers is rooted in the quasi-static method. However, this methodology faces criticism for neglecting tower-line coupling dynamics. Despite efforts to boost structural wind resilience, the research on tower failure mechanisms, especially under extreme winds considering tower-line coupling, is limited. To address this gap, the wind-induced dynamic failure modes of the transmission tower-line system are investigated in this paper. The consistent discrete random flow generation method is employed to simulate the fluctuating wind field for transmission lines. Incorporating the compressive buckling mode of angle steel, the plastic hinge model of the frame element is employed to simulate mechanical nonlinearity. A typical transmission tower-line system is concerned, with a finite element model established for a three-tower, four-line coupled configuration. The findings reveal that the wind-induced collapse of the transmission tower is directly triggered by the buckling failure of the compressed main members, with the vulnerable section located beneath the lower cross-arm. The transmission tower experiences bidirectional bending and compression instability under an unfavorable wind direction. In contrast, the traditional pushover collapse modes of the transmission tower cannot fully capture the characteristics of the collapse failure, mainly due to the ignorance of the transverse wind force action induced by the coupling effect. This research underscores the importance of incorporating lateral dynamic considerations into transmission tower designs and advocates for optimizing strategies to mitigate wind-induced collapse modes.

Keywords: transmission tower-line; wind load; wind-induced vibration response; collapse failure; plastic hinge (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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