An experimental study on the construction torque and transversal vibration of bolted joints of transmission towers in low temperature regions with high temperature difference
YANG Fengli, WANG Xuming, ZHU Binrong
China Electric Power Research Institute, Beijing 100055,China
Abstract:Loosing of the bolted joints is the main reason for the cross arm damage of transmission towers in strong wind areas and conductor galloping areas. The bolt stress and anti-loosing capability can be effected by the operation temperature of electric power transmission lines. By considering the low temperature conditions and high temperature difference conditions, the torque tests and transversal vibration tests on bolts used in transmission towers were carried out. The clamp forces and the strength utilization coefficients of the transmission tower bolts were obtained from-50℃ to 30℃. Effects of the low temperature and high temperature difference characteristics on the clamp forces and the anti-loosing capabilities of transmission tower bolts were determined. The anti-loosing capabilities of single-nut bolts and double-nut bolts used in transmission towers under low temperature conditions and high temperature difference conditions were assessed. According to the construction torques of transmission tower bolts regulated in the current codes, the strength safety of transmission tower bolts can be assured at the lowest temperature of-50℃ and the maximum temperature difference of 80℃. When the transmission tower bolts are initially torqued by the same torque at room temperature in transversal vibration tests, with the decrease of the environmental temperature in the range from -50℃ to 30℃, the residual pretension percentages of transmission tower bolts gradually decrease with continuous vibration. It means that the anti-loosing capabilities can be enhanced in lower operating temperature environment. Especially for the single-nut transmission tower bolts, the anti-loosing capability at -50℃ is higher than the anti-loosing capability at 20℃ by 41.0%.
杨风利,王旭明,朱彬荣. 低温及大温差区输电铁塔螺栓扭矩及横向振动试验研究[J]. 振动与冲击, 2020, 39(12): 257-264.
YANG Fengli, WANG Xuming, ZHU Binrong. An experimental study on the construction torque and transversal vibration of bolted joints of transmission towers in low temperature regions with high temperature difference. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(12): 257-264.
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