Numerical simulation of loosening law of bolted joints under lateral vibration

被引：0
|
作者：
Zhao, Weiping [1 ]
Chang, Haotan [1 ]
Ji, Chunlei [2 ]
Guo, Xinsuo [1 ]
He, Yuxiang [1 ]
机构：
[1] School of Mechanics and Civil Engineering, China University of Mining and Technology (Beijing), Beijing,100083, China
[2] China Railway 16st Bureau Group Road & Bridge Engineering Co., Ltd., Beijing,101500, China
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2024年 / 43卷 / 08期
关键词：
The bolted connection joints of transmission towers often experience loosening due to transverse cyclic loads; resulting in damage to the transmission towers. Currently; many single-bolt tests conducted on vibration test machines and finite element studies are not applicable to the actual working conditions of angle steel-bolt group joints due to bolt constraint issues. To address this problem; a refined bolt model considering thread incline was established in ABAQUS. The applicability of the finite element model was verified based on the results of fastener tests. The bolt model was then extended to complex single-limb; single-wrap; and double-wrap angle steel-bolt group joint models to analyze the loosening mechanism and pre-tension variation process of bolt group joints under transverse vibration loads. Analysis results show that under transverse cyclic loads; the pre-tension alternates between increasing and decreasing. The thread contact surface enters the slip state before the pressure surface of the bolt head. With an increase in the friction coefficient and pre-torque; the decreasing trend of pre-tension becomes smaller. With an increase in vibration amplitude; the decreasing trend of pre-tension becomes larger. The vibration frequency has negligible impact on bolt loosening. The degree of bolt loosening in single-wrap and double-wrap joints gradually decreases from the outer side to the inner side. Applying preload will reduce the tendency of bolt loosening to some extent. The degree of loosening for double-limbsingle-packet joint bolts decreases by 16. 00% to 23. 24%; and for double-limbdouble-packet joint bolts; it decreases by 2. 63% to 3. 80% . Therefore; it is important to monitor the easily loosened bolt locations in actual engineering to ensure the load-bearing capacity of the joints. © 2024 Chinese Vibration Engineering Society. All rights reserved;
D O I：
10.13465/j.cnki.jvs.2024.08.007
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页码：61 / 69
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