Experimental study on the transversal vibration of double-nut bolted joints of transmission towers
YANG Fengli1,LI Zheng1,ZHANG Dachang2,ZHU Binrong1,WANG Xuming1
1.China Electric Power Research Institute, Beijing 100055, China;
2. College of Civil engineering, Nanjing University of Technology, Nanjing 210009, China
Loosing of bolted joints is the main reason for the cross arm damage of transmission towers in strong wind areas and conductor galloping areas. Transversal vibration tests on three types of doublenut bolted joints used in transmission towers were carried out. The effect of the ratio between the torques of top nut and bottom nut on the pretension reduction characteristic of doublenut bolts was analyzed. The time histories of the pretension of doublenut bolted joints were obtained. The optimal ratio of 25% between the torques of top nut and bottom nut in the bolted joint of transmission towers was proposed. Transversal vibration tests on the cross arm of the transmission tower in conductor galloping load case was completed. The loosing order and the location distribution of loosing bolts of the tested cross arm were determined. It is shown that the bolts in the bottom plane of the cross arm are easier to be loosen in galloping load case, especially for the connected bolts between the main member and the fixed points, as well as for the connected bolts between members at the suspension points at the end part of the tested cross arm. It was suggested that the antiloosing capability should be further enhanced for the connected bolts of the main members and the diagonal members at the bottom plane.
杨风利1,李正1,张大长2,朱彬荣1,王旭明1. 输电铁塔双螺母防松螺栓横向振动试验研究[J]. 振动与冲击, 2018, 37(10): 164-171.
YANG Fengli1,LI Zheng1,ZHANG Dachang2,ZHU Binrong1,WANG Xuming1. Experimental study on the transversal vibration of double-nut bolted joints of transmission towers. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(10): 164-171.
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