In order to decorate the night view for cities, installing lighting fixtures on stay cables of existing cable-stayed bridges is an effective choice, but the aerodynamic characteristics of the stay cables will change significantly. This paper presents a study on the galloping stability of the stay cables equipped with lighting fixtures. The static aerodynamic coefficients were computed using computational fluid dynamics (CFD) simulations, and the reason for the negative slope of the lift coefficient was discussed based on the changes in pressure distributions and flow field characteristics. Wind tunnel tests were further carried out to verify the numerical results. The possible galloping instability intervals for the stay cables with lighting fixtures were calculated. The results show that the existence of lighting fixtures has significant effects on the aerodynamic performance of stay cables. The slope of the lift coefficient becomes negative within several intervals of angles of attack, which indicates the possible galloping instability. The sudden decrease in the lift coefficient is mainly related to the vortex which covers the concave between the lighting fixture and the stay cable and makes the separated flow cannot reattach.

为装饰城市夜景，在既有斜拉桥的斜拉索上安装照明灯具是一种有效的选择，但斜拉索的气动特性会发生显着变化。本文对装有照明装置的斜拉索的驰骋稳定性进行了研究。使用计算流体动力学 (CFD) 模拟计算静态空气动力系数，并根据压力分布和流场特性的变化讨论升力系数为负斜率的原因。进一步进行风洞试验以验证数值结果。计算了带照明装置的斜拉索可能的不稳定性区间。结果表明，照明灯具的存在对斜拉索的气动性能有显着影响。升力系数的斜率在几个攻角区间内变为负值，这表明可能存在疾驰不稳定性。升力系数的突然降低主要与覆盖在灯具与斜拉索之间凹面的涡流使分离的流无法重新附着有关。