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桥梁长索结构风致振动研究新进展
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Recent Challenges and Advances on Study of Wind-induced Vibrations of Bridge Cables
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    摘要:

    随着桥梁跨径的增大,桥梁索结构的长细比越来越大、频率越来越低,出现了一些 新的风致振动问题,如悬索桥吊索风致振动、斜拉索高阶涡激共振、安装亮化灯具的桥梁索结 构驰振等. 针对这些新挑战,采用现场观测、风洞试验和理论分析等手段,研究人员进行了系统 的机理研究,并提出了一些有效的振动控制措施. 结果表明:悬索桥吊索风致振动的机理复杂, 在斜拉索上积累的振动控制经验难以直接应用,安装刚性分隔架是抑制索股相对振动的有效 手段;已在多座大跨径斜拉桥上观测到斜拉索高阶涡激共振,增加了斜拉索振动控制的难度, 采用双阻尼器是可同时控制斜拉索高阶涡激共振和低阶风雨激振的有效方案;在桥梁索结构 上安装亮化灯具极易引发驰振,增加阻尼器和优化灯具气动外形是避免该类振动的有效措施.

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    With the increase of bridge main span,the slenderness ratio of the cables is getting larger and the fre? quency is getting lower and lower. Several new types of wind-induced vibrations,including wind-induced vibration of the hangers of suspension bridges,high-order vortex-induced vibration of stay cables,and galloping vibration of bridge cables attached with lighting lamps,were observed on real bridges. Due to these new challenge,the mecha? nisms and the corresponding countermeasures were carefully studied by using field observations,wind tunnel tests and theoretical analyses. The results show that the mechanism of the wind-induced vibration of the hangers of sus? pension bridges is complex and the effective measures on stay cables of cable-stayed bridges are not suitable for miti? gating the wind-induced vibration of the hangers. It seems that rigid spacers are an effective measure to reduce the relative vibration between the cables of the hanger. Large amplitude of vortex-induced vibration of stay cables is ob? served on several long-span cable-stayed bridges,which increase the difficulty of vibration control. It appears that installing two dampers at the end of the cable is an effective way to simultaneously reduce both the high-order vortexinduced vibration and the low-order rain-wind-induced vibration of stay cables. Galloping vibration can be easily evoked by installing lighting lamps on stay cables. This kind of cable vibration can be effectively mitigated by in? creasing structural damping and changing the aerodynamic configuration of the lamps.

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陈政清 ,李寿英 ,邓羊晨 ,王园园 ,安苗 ,杨超 .桥梁长索结构风致振动研究新进展[J].湖南大学学报:自然科学版,2022,49(5):1~8

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  • 在线发布日期: 2022-06-06
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