横向振动作用下螺栓连接节点松动规律数值模拟

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摘要输电铁塔螺栓连接节点因常常受到横向往复荷载作用发生松动，从而导致输电铁塔的损害。目前许多在紧固件振动试验机上进行的单个螺栓试验与有限元研究因螺栓约束条件问题并不适用于角钢-螺栓群节点的实际工作情况，针对这一问题在ABAQUS中建立考虑螺纹升角的精细化螺栓模型，根据紧固件试验结果验证有限元模型的适用性，再将螺栓模型推广到复杂的单肢、单包及双包的角钢-螺栓群节点模型，分析螺栓群节点在横向振动荷载下松动机理与预紧力变化过程。分析结果表明：在横向循环载荷作用下，预紧力出现交替的上升与下降；螺纹接触面先于螺头承压面进入滑移状态；螺栓预紧力随摩擦系数、预紧扭矩的增大而降低，随着振动幅值的增大而增大，振动频率对螺栓松动影响不显著；单包与双包节点螺栓松动程度从外侧到内侧逐渐递减，施加预压力在一定程度上可降低螺栓的松动趋势，双肢单包节点螺栓松动程度下降了16%~23.24%，双肢双包节点下降了2.63%~3.80%。因此在实际工程要做好对易松动部位螺栓的监测，保证节点的承载能力。

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	赵卫平1
	常昊坛1
	籍春雷2
	郭新锁1
	何宇翔1

关键词 ：螺栓连接节点, 横向振动荷载, 螺栓松动, 预紧力下降, 有限元仿真

Abstract：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 is established in ABAQUS. The applicability of the finite element model is verified based on the results of fastener tests. The bolt model is 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. The 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 a 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-limb single-packet joint bolts decreases by 16% to 23.24%, and for double-limb double-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.

Key words： bolted joints lateral vibration loads bolt loosening preload drop finite element simulation

收稿日期: 2023-06-26 出版日期: 2024-04-28

引用本文:

赵卫平1，常昊坛1，籍春雷2，郭新锁1，何宇翔1. 横向振动作用下螺栓连接节点松动规律数值模拟[J]. 振动与冲击, 2024, 43(8): 61-69.
ZHAO Weiping1，CHANG Haotan1，JI Chunlei2，GUO Xinsuo1，HE Yuxiang1. Numerical simulation of loosening law of bolted joints under lateral vibration. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(8): 61-69.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2024/V43/I8/61

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