| 基于风洞试验的变截面圆灯柱涡激振动与影响因素研究 |
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| 引用本文： | 周旭辉,韩艳,颜虎斌,丁少凌,王磊.基于风洞试验的变截面圆灯柱涡激振动与影响因素研究[J].中国公路学报,2021,34(6):48-56. |
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| 作者姓名： | 周旭辉 韩艳 颜虎斌 丁少凌 王磊 |
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| 作者单位： | 1. 长沙理工大学 土木工程学院, 湖南 长沙 410114;2. 中交第二公路勘察设计研究院有限公司, 湖北 武汉 430052 |
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| 基金项目： | 国家自然科学基金优秀青年科学基金项目（51822803）；国家自然科学基金项目（51678079，51778073，51978087）；湖南省杰出青年科学基金项目（2018JJ1027）；湖南省教育厅科学研究优秀青年基金项目（16B011）；湖南省研究生科研创新项目（CX20200833） |
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| 摘 要： | 为了研究某实桥变截面圆灯柱发生的风致二阶振动现象，采用多段薄壁空心铝管焊接并覆盖泡沫管和柔性PVC薄膜的方法，设计制作了满足相似比要求的变截面灯柱气弹模型，解决了低质量比、低阻尼比变截面细长结构风洞试验不便模拟的问题。通过风洞试验，采用非接触式视频测量位移系统和眼镜蛇探针测试了不同风速下灯柱位移响应和尾流风速，重现了灯柱的二阶振动现象，通过分析确定其为涡激振动；采用傅里叶变换和小波分析研究了变截面灯柱的涡脱频率和涡激振动时频特性；开展了不同焊缝位置对灯柱涡激振动影响研究，分析了3种不同螺旋线布置方式对灯柱涡激振动的抑制效果。研究结果表明：灯柱在涡激振动锁定区内发生单一模态的涡激振动，运动轨迹为清晰的椭圆形，而在锁定区外发生多模态振动；变截面灯柱中部存在一定长度的控制区域，当中部控制区域涡脱频率接近结构固有频率时即发生涡激振动锁定现象，当中部控制区域脱离锁定频率，此时圆柱的涡激振动响应迅速降低；灯柱涡激振动响应受焊缝的位置影响显著，不同的焊缝位置可能抑制或者增强涡激振动；8 cm螺距双螺旋线能够有效控制灯柱模型涡激振动响应。
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| 关 键 词： | 桥梁工程 变截面圆灯柱 风洞试验 气弹模型 涡激振动 多模态 焊缝影响 螺旋线 |
| 收稿时间： | 2019-11-15 |
Vortex-induced Vibration of Circular Lamppost with Variable Section and Its Influencing Factors Based on Wind Tunnel Tests |
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| ZHOU Xu-hui,HAN Yan,YAN Hu-bin,DING Shao-ling,WANG Lei.Vortex-induced Vibration of Circular Lamppost with Variable Section and Its Influencing Factors Based on Wind Tunnel Tests[J].China Journal of Highway and Transport,2021,34(6):48-56. |
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| Authors: | ZHOU Xu-hui HAN Yan YAN Hu-bin DING Shao-ling WANG Lei |
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| Affiliation: | 1. School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China;2. China Communications Second Highway Survey Design and Research Institute Co. Ltd., Wuhan 430052, Hubei, China |
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| Abstract: | An aeroelastic model of the lamppost satisfying the similarity ratio was designed to investigate the second-order vortex-induced vibration of a circular lamppost with a variable cross-section on a bridge. It was established by applying multisection thin-walled hollow aluminum tubes, foam tubes, and flexible polyvinyl chloride films. The difficulty in simulating a slender structure with a variable section, low mass ratio, and low damping ratio in a wind tunnel was solved. Through wind tunnel tests, the displacement response and the wake wind velocity of the lamppost were measured using a noncontact video test system and a cobra probe, respectively. Next, the second-order vibration of lamppost was simulated and determined to be vortex-induced vibration through analysis. The vortex shedding frequency and time-frequency characteristics of the vortex-induced vibration were determined using Fourier transform and wavelet analysis, respectively. Finally, the effects of the weld positions and the arrangement forms of the helical wire on vortex-induced vibration of the lamppost were examined. The results show that the single-mode vortex-induced vibration occurs in the frequency lock-in region, of which the movement track is an apparent ellipse. However, the multimode vibration occurs outside the frequency lock-in region, and a control region exists in the middle of the lamppost. When the vortex shedding frequency of the control region is close to the natural frequency of the structure, lock-in occurs. In the case that the vortex shedding frequency departs from the natural frequency, the response of the vortex-induced vibration decreases rapidly. The vortex-induced vibration of the lamppost is significantly influenced by the position of the weld, and the weld can suppress or improve the vibration response of the lamppost. The vortex-induced vibration of the lamppost model can be effectively controlled using an 8 cm double helical wire. |
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| Keywords: | bridge engineering circular lamppost with variable section wind tunnel test aeroelastic model vortex-induced vibration multi-mode influence of weld spiral line |
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