Fatigue experimental study on the joint plate under out-of-plane vibration in steel tubular transmission towers

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL Thin-Walled Structures Pub Date : 2025-07-01 Epub Date: 2025-03-07 DOI:10.1016/j.tws.2025.113178

Jiaqi Wang , Xiaohong Wu , Sitong Wei , Chao Zhao , Ming Sheng , Pereira Paulo , Qing Sun

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Abstract

Vortex-induced vibration (VIV) of steel tubular members in transmission towers under light wind conditions leads to long-term out-of-plane vibration of the joint plates at the ends of the members, which in turn causes fatigue cracking. Given the current inability to fully elucidate the mechanism of VIV, this study focuses on investigating the fatigue performance of such joints to guide fatigue design and ensure the structural safety. In this study, a series of fatigue tests are conducted to explore the influence of two methods—raising the ring plate height and increasing the joint plate thickness—on the fatigue performance of the joints. The analysis includes aspects such as fatigue failure modes, stiffness degradation, crack propagation, life prediction, and changes in dynamic properties. The results indicate that both methods contribute to improving the fatigue life in the two stages of the fatigue failure process to varying degrees. Furthermore, the S-N curve established based on average hot spot stress can effectively predict the fatigue life in the first failure stage. The study also finds a near-linear relationship between crack propagation on the joint plate and stiffness degradation, with the slope depending on the initial stiffness of the joint. Measurements of dynamic properties throughout various stages of fatigue damage indicated a substantial decrease in both the damping ratio and natural frequency of the system as the joint plate incurred fatigue damage.

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钢管输电塔连接板面外振动疲劳试验研究

输电塔钢管构件在弱风条件下的涡激振动会导致构件端部连接板产生长期的面外振动，进而产生疲劳开裂。鉴于目前还不能完全阐明涡激振动的机理，本研究将重点研究此类节点的疲劳性能，以指导疲劳设计，确保结构安全。本文通过一系列的疲劳试验，探讨了提高环板高度和增加节点板厚度两种方法对节点疲劳性能的影响。分析包括疲劳失效模式、刚度退化、裂纹扩展、寿命预测和动态特性变化等方面。结果表明，两种方法都不同程度地提高了疲劳失效过程中两个阶段的疲劳寿命。基于平均热点应力建立的S-N曲线能有效预测第一失效阶段的疲劳寿命。研究还发现节理板裂纹扩展与刚度退化呈近似线性关系，其斜率取决于节理的初始刚度。在疲劳损伤各个阶段的动态特性测量表明，在接合板发生疲劳损伤时，系统的阻尼比和固有频率都显著降低。

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.