Experimental study on the hysteretic performance of bolted lap joints of a transmission tower

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (22) : 10-18.

LI Jiaxiang1,2,3,4，ZHANG Chao1，CHENG Jinpeng1，GU Xiaowei1，WANG Hao1，JIANG Wenqiang2

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Abstract

During the vibration of the transmission tower, the joints often bear cyclic loading. To study the mechanical properties of typical bolted joints of transmission towers under reciprocating load, twenty-one groups of typical bolted joint specimens were designed. Through 3 groups of monotonic loading tests and 18 groups of low cyclic loading tests, the load-displacement curves of the joint specimens were obtained. The effects of load types and joint parameters on the mechanical properties of bolted joints were studied, and the mechanical behavior of the joints under cyclic loading was analyzed. The results show that the load type has little effect on the failure mode and slip load of the joint, mainly affecting the ultimate load of the joint and its corresponding displacement. The difference between test and simulation results is caused by the uncertainty of bolt position in the bolt hole and the inconsistency of multi-bolt behavior. The strength of bolted joints increases with the increase of bolt diameter and grade, but the hole spacing has little effect on it. The ultimate bearing capacity of joints increases with the increase of the number of bolts, but not all of them increase linearly. The results provide a reference for the mechanical analysis of transmission towers.

Key words

transmission tower / bolted joint / model test / load-displacement curve / bolt slippage

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LI Jiaxiang1,2,3,4，ZHANG Chao1，CHENG Jinpeng1，GU Xiaowei1，WANG Hao1，JIANG Wenqiang2. Experimental study on the hysteretic performance of bolted lap joints of a transmission tower[J]. Journal of Vibration and Shock, 2023, 42(22): 10-18

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