摘要
涡激共振是大跨度柔性桥梁在低风速下常见的一种气弹现象,其具有自激限幅性质,且对结构阻尼及气动外形的微小变化较敏感。以一座大跨度开口断面主梁的斜拉桥为工程背景,开展了3种风攻角下施工状态和成桥状态的节段模型涡激共振试验研究,并提出了包括风嘴、导流板、稳定板、扰流板及其组合等多种气动控制措施。结果表明:稳定板可显著减小竖向涡激共振位移,而扰流板可显著减小扭转位移;1.5m稳定板与0.9m扰流板的组合形式为最优控制措施;1.44m宽度的导流板为次优选择,45°风嘴也是有效的控制措施但效果稍差。
Vortex-induced vibration is a common aeroelastic phenomenon for long-span flexible bridge in low wind velocity. It is self-excited, amplitude-limited and sensitive to damp and slight changes of aerodynamic configuration. A long-span cable-stayed bridge with open sections was cited as an example. Wind tunnel tests of sectional model were conducted with three different wind angles in both construction and completion states. Different aerodynamic control measures, including guide vane, wind fairing, stabilizer and spoiler were considered. The result indicates that stabilizer is effective in controlling heaving displacement while spoiler is effective with torsion. The optimal measure is the combination of 1.5 m stabilizer and 0. 9 m spoiler. Guide vane of 1.44 m is suboptimal. Wind fairing of 45° is also effective.
出处
《中国科技论文》
CAS
北大核心
2015年第7期760-764,787,共6页
China Sciencepaper
基金
国家自然科学基金资助项目(91215302)
关键词
桥涵工程
开口截面
斜拉桥
涡激共振
气动控制措施
控制效果
bridge bearings
open section
cable-stayed bridge
vortex-induced vibration
vibration control
control result
