Wind and Structures

Techno-Press (테크노프레스)
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Wind-induced mechanical energy analyses for a super high-rise and long-span transmission tower-line system

  • Zhao, Shuang (School of Civil Engineering and Architecture, Chongqing University of Science and Technology) ;
  • Yan, Zhitao (School of Civil Engineering and Architecture, Chongqing University of Science and Technology) ;
  • Savory, Eric (Department of Mechanical and Materials Engineering, University of Western Ontario) ;
  • Zhang, Bin (CMCU Engineering Co., Ltd.)
  • Received : 2021.02.16
  • Accepted : 2022.01.03
  • Published : 2022.02.25
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Abstract

This study aimed to analyze the wind-induced mechanical energy (WME) of a proposed super high-rise and long-span transmission tower-line system (SHLTTS), which, in 2021, is the tallest tower-line system with the longest span. Anew index - the WME, accounting for the wind-induced vibration behavior of the whole system rather than the local part, was first proposed. The occurrence of the maximum WME for a transmission tower, with or without conductors, under synoptic winds, was analyzed, and the corresponding formulae were derived based on stochastic vibration theory. Some calculation data, such as the drag coefficient, dynamic parameters, windshielding areas, mass, calculation point coordinates, mode shape and influence function, derived from wind tunnel testing on reducedscale models and finite element software were used in calculating the maximum WME of the transmission tower under three cases. Then, the influence of conductors, wind speed, gradient wind height and wind yaw angle on WME components and the energy transfer relationship between substructures (transmission tower and conductor) were analyzed. The study showed that the presence of conductors increases the WME of transmission towers and changes the proportion of the mean component (MC), background component (BC) and resonant component (RC) for WME; The RC of WME is more susceptible to the wind speed change. Affected by the gradient wind height, the WME components decrease. With the RC decreasing the fastest and the MC decreasing the slowest; The WME reaches the its maximum value at the wind yaw angle of 30°. Due to the influence of three factors, namely: the long span of the conductors, the gradient wind height and the complex geometrical profile, it is important that the tower-line coupling effect, the potential for fatigue damage and the most unfavorable wind yaw angle should be given particular attention in the wind-resistant design of SHLTTSs

Keywords

Acknowledgement

The research described in this paper was funded by the Science and Technology Research Program of the Chongqing Municipal Education Commission (Grant No. KJQN202001548) the Scientific Research Foundation of Chongqing University of Science and Technology (Grant No. ckrc2019036) and the Chongqing postdoctoral Foundation (cstc2021jcyj-bsh0260)

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