Failure Patterns of Transmission Tower-Line System Caused by Landslide Events

Hong Yu, Hao Li, Zhi-Qiang Zhang, Gui-Feng Zhang, Da-Hai Wang and Hua-Dong Zheng ()
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Hong Yu: Electric Power Research Institute, Yunnan Power Grid Co., Ltd., Kunming 650233, China
Hao Li: Electric Power Research Institute, Yunnan Power Grid Co., Ltd., Kunming 650233, China
Zhi-Qiang Zhang: Electric Power Research Institute, China Southern Power Grid Co., Ltd., Guangzhou 510663, China
Gui-Feng Zhang: Electric Power Research Institute, China Southern Power Grid Co., Ltd., Guangzhou 510663, China
Da-Hai Wang: School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430074, China
Hua-Dong Zheng: School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430074, China

Energies, 2022, vol. 15, issue 19, 1-17

Abstract: A transmission tower-line system consists of many towers and cables, which is a long-span structure. Due to topographical restrictions, the structure inevitably passes through wide areas prone to landslide hazards. The landslide causes the failure of the tower foundation and threatens the safety of the power transmission system. Therefore, the aim of this study was to investigate the collapse patterns of a transmission tower-line structure under landslides. The explicit analysis method was used to deal with the nonlinear dynamic response equations of the structure. To prove the effect of the landslides on the collapse patterns of the transmission tower-line structure, two foundation failure cases (Case 1 and Case 2) under landslides were considered. For each case, the displacement responses at tower tops and the progressive collapse behavior were analyzed, which illustrate that the failure patterns of the tower-line structure under landslides are dominated by two factors, i.e., the failure mode of the tower foundation and the pulling effect of cables. The overall tilting and hinge formation in the middle of the tower body are the main collapse patterns of the structure under Case 1 and Case 2, respectively. In addition, because of the pulling of cables, the collapse of one tower induced by the landslides always triggers the local failure of neighboring tower heads.

Keywords: collapse analysis; tower-line system; landslide; collapse pattern; explicit dynamic analysis (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: 2022
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