Cup-type transmission towers are frequently used in 1000kV UHV transmission lines. However, different calculation models are used for wind loads calculation of crank arms in design. Until now there has been no specialized study on wind loads of cranks arms. Wind tunnel tests were conducted on crank arm models of a cup-type transmission tower under 15m/s and 20m/s wind velocities. The drag coefficients along wind direction axis and body-fitted axis for 11 skewed angles were obtained. The models’ shape coefficients over the windward surface and the leeward one, respectively and the leeward surface shielding factor η of the models were obtained. The skewed wind load factors and the effective projected areas (EPA) of the models were analyzed. The parameters determined with the wind tunnel tests for the wind loads calculation of crank arms were compared with standard values in Chinese and foreign codes. Some design suggestions for the wind loads calculation of crank arms of cup-type transmission towers were proposed. It was shown that the wind loads of crank arms calculated according to the tower body model of Chinese code can meet safety requirements, but the total wind loads of crank arms calculated for 90° wind incidence angle are conservative; the wind loads of crank arms calculated according to the cross-arm model of Chinese code are much lower than the wind tunnel test values for 45°, 60° and 90° wind incidence angles, so the wind loads of crank arms are underestimated and there is a safety hazard in anti-wind design of structures.
杨风利1，牛华伟2，杨靖波1，张宏杰1. 酒杯型输电铁塔曲臂风荷载风洞试验研究[J]. 振动与冲击, 2017, 36(24): 170-176.
YANG Fengli1, NIU Huawei2, YANG Jingbo1, ZHANG Hongjie1. Wind tunnel tests for wind loads of crank arms of cup-type transmission towers. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(24): 170-176.
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