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Research on Failure and Collapse of Transmission Tower Line System Under Downburst Action Based on Energy Method(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2020年06期
Page:
73-80
Research Field:
Publishing date:

Info

Title:
Research on Failure and Collapse of Transmission Tower Line System Under Downburst Action Based on Energy Method
Author(s):
WEI Wen-hui;  ZHOU Xiang;  DENG Chen;  JI Bai-feng
Hubei Key Laboratory of Roadway Bridge & Structure Engineering, Wuhan University of Technology, Wuhan 430070, Hubei, China
Keywords:
energy method;  transmission tower line system;  downburst;  dynamic stability;  failure;  collapse
PACS:
TU311
DOI:
-
Abstract:
The failure and collapse analysis of transmission tower line system under downburst was carried out based on energy method. The finite element model of “one tower and two lines” transmission tower system was established by using ABAQUS. By using the time-varying average wind speed simulation method based on the improved OBV model, the time history curves of the downburst wind speed of each node of transmission tower and wire were derived and obtained. By usingthe dynamic stability discrimination method based on characteristic energy, the response of tower line system under three downburst dynamic conditions with different wind speeds was analyzed. The failure time of transmission tower system under downburst was determined. The failure and collapse mechanism of transmission tower system with large span was discussed. The results show that when the energy method is used to analyze the structure system, the last time when the characteristic energy exceeds the input energy is the failure time of the structure. Based on the energy method, the analysis of the transmission tower line system under the action of downburst can quickly and accurately judge the time when the whole transmission tower line system loses stability and collapses, and it has strong engineering practical value. At the moment of collapse, the failure of the members in the weak area caused by the instability of the main material will lead to the overall instability of the transmission tower, and eventually make the structure fail and collapse.

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