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Wind and Structures Volume 34, Number 2, February 2022 (Special Issue) pages 185-197 DOI: https://doi.org/10.12989/was.2022.34.2.185 |
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Wind-induced mechanical energy analyses for a super high-rise and long-span transmission tower-line system |
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Shuang Zhao, Zhitao Yan, Eric Savory and Bin Zhang
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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. | ||
| Key Words | ||
| finite element model; gradient wind height; transmission tower-line system; wind-induced mechanical energy; wind tunnel test | ||
| Address | ||
| Shuang Zhao:School of Civil Engineering and Architecture, Chongqing University of Science and Technology, No. 20 Da Xue Cheng Dong Road, Chongqing 401331, P.R. China Zhitao Yan:School of Civil Engineering and Architecture, Chongqing University of Science and Technology, No. 20 Da Xue Cheng Dong Road, Chongqing 401331, P.R. China Eric Savory:Department of Mechanical and Materials Engineering, University of Western Ontario, No. 1151 Richmond Street, London N6A 5B9, Canada Bin Zhang:CMCU Engineering Co., Ltd., No. 17 Yu Zhou Road, Chongqing 400039, P.R. China | ||