Experimental study on the transversal vibration of double-nut bolted joints of transmission towers

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (10) : 164-171.

YANG Fengli1,LI Zheng1,ZHANG Dachang2,ZHU Binrong1,WANG Xuming1

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Abstract

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 doublenut 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 doublenut bolts was analyzed. The time histories of the pretension of doublenut 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 antiloosing capability should be further enhanced for the connected bolts of the main members and the diagonal members at the bottom plane.

Key words

Transmission tower / bolt / transversal vibration / pretension / installation torque

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YANG Fengli1,LI Zheng1,ZHANG Dachang2,ZHU Binrong1,WANG Xuming1. Experimental study on the transversal vibration of double-nut bolted joints of transmission towers[J]. Journal of Vibration and Shock, 2018, 37(10): 164-171

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