The main cable bent around the saddle of the suspension bridge is subjected to the wind, the vehicle, the bridge’s own weight and the corrosive media. The coupling of the three loads and the environments causes the friction, the corrosion, and the fatigue (tribo-corrosion-fatigue) among the wires inside the main cable. In this paper, a wire bending tribo-corrosion-fatigue test rig was designed and developed. The effect of fatigue load on the bending friction behaviors between the cable wires in ultrapure water and 3.5% NaCl solution was explored. The tribological properties and electrochemical corrosion behaviors under different fatigue loading ranges were investigated. The tribo-corrosion-fatigue interaction between the cable wires was quantitatively characterized, and the mechanism of the interaction was analyzed. The results demonstrate that the increasing fatigue load exacerbates the coupling damage of the cable wires attributed to the enhanced interaction. The findings carry theoretical importance when assessing the main cable’s deterioration and the load-bearing safety of a suspension bridge.

悬索桥鞍座周围弯曲的主缆承受风、车辆、桥梁自重和腐蚀介质的作用。三种载荷和环境的耦合导致主缆内部导线之间的摩擦、腐蚀和疲劳（摩擦腐蚀疲劳）。本文设计并开发了一种线材弯曲摩擦腐蚀疲劳试验台。探讨了疲劳载荷对超纯水和3.5% NaCl溶液中电缆线间弯曲摩擦行为的影响。研究了不同疲劳载荷范围下的摩擦学性能和电化学腐蚀行为。定量表征了电缆线之间的摩擦-腐蚀-疲劳相互作用，并分析了相互作用的机理。结果表明，疲劳载荷的增加加剧了由于相互作用增强而导致的电缆线的耦合损伤。这些发现在评估主缆老化和悬索桥的承载安全性时具有重要的理论意义。