[1] CAI Yunzhu, XING Yujie, XIE Qiang, CHENG Xiaowu, et al. Effects of bolt joint loosening on the dynamic characteristics of electric angle steel transmission tower [J]. Journal of Southeast University (English Edition), 2025, 41 (2): 180-189. [doi:10.3969/j.issn.1003-7985.2025.02.007]
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Effects of bolt joint loosening on the dynamic characteristics of electric angle steel transmission tower(
)
螺栓节点松动对角钢输电塔动力特性影响规律研究
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 41
- Issue:
- 2025 2
- Page:
- 180-189
- Research Field:
- Electrical Engineering
- Publishing date:
- 2025-06-17
Info
- Title:
- Effects of bolt joint loosening on the dynamic characteristics of electric angle steel transmission tower
- 螺栓节点松动对角钢输电塔动力特性影响规律研究
- Author(s):
- CAI Yunzhu1, XING Yujie1, XIE Qiang2, CHENG Xiaowu1
- 1.College of Civil Engineering, Nanjing Tech University, Nanjing 211816, China
2.College of Civil Engineering, Tongji University, Shanghai 200092, China
- PACS:
- TM75
- DOI:
- 10.3969/j.issn.1003-7985.2025.02.007
- Abstract:
- Transmission towers, serving as the support structure of transmission lines, are significant for the functionality of an electric transmission system. Bolt joint loosening is one of the critical factors that can affect the safety and stability of transmission towers. In this study, the effects of bolt joint loosening on the dynamic characteristics of a 220-kV angle steel transmission tower are the main topic of concern. First, the mechanical properties of typical joints subjected to different degrees of bolt loosening are studied by finite solid-element simulation, based on which a finite hybrid-element modeling method is developed for a tower structure suffering varying loose degrees in the joints. Taking a 220-kV angle steel transmission tower as the object, the influence of the position and degree of loosening on the tower’s natural frequencies and mode shapes are simulated and discussed. The results demonstrate that the main-member splice joint and the main diagonal-horizontal member gusset plate joint account for the dominant impact on the dynamic characteristics of the tower. In addition, the dominant joint shifts from the main-member splice joint to the main diagonal-horizontal member gusset plate joint as the considered modal order increases. In the case of double joints loosening simultaneously, the loosening of nondominant joints has nonnegligible effects on the tower as well.
- 输电塔作为输电线的支撑结构，对输电线路的正常运行至关重要，而螺栓节点松动是影响输电塔安全稳定性的关键因素之一。本研究以220 kV角钢输电塔为研究对象，聚焦螺栓节点松动对角钢塔动力特性的影响。首先，通过实体单元有限元模拟，研究了典型节点在不同螺栓松动程度下的力学特性，并在此基础上开发了一种考虑节点松动程度变化的输电塔混合单元建模方法。然后，以220 kV角钢输电塔为研究对象，模拟并讨论了节点松动位置和程度对塔体固有频率和振型的影响及其规律。结果表明：主材拼接节点和主-斜-横材节点板节点对塔体动力特性具有主导影响。此外，随着所考查模态阶次的增长，主导节点从主材拼接节点逐渐转变为主-斜-横材节点板节点。当考虑双组节点同时松动时，非主导节点的松动对塔体的影响也不可忽视。
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Memo
- Memo:
-
Received 2024-06-10,Revised 2024-09-08.
Biography:Cai Yunzhu (1984—), female, doctor, lecturer, yunzhucai@ njtech.edu.cn.
Foundation items:The Youth Foundation Project of Jiangsu Province (No. BK20230337), the Natural Science Research of Jiangsu Higher Education Institutions of China (No. 22KJB560004), the National Natural Science Foundation of China (No. 52278523).
Citation:CAI Yunzhu,XING Yujie,XIE Qiang,et al.Effects of bolt joint loosening on the dynamic characteristics of electric angle steel transmission tower[J].Journal of Southeast University (English Edition),2025,41(2):180-189.DOI:10.3969/j.issn.1003-7985.2025.02.007.DOI:10.3969/j.issn.1003-7985.2025.02.007