|
| 安装亮化灯具斜拉索三维气动性能试验研究 |
| Experimental Study on Aerodynamic Performance of 3D Stay Cable with Lighting Lamp |
| 投稿时间：2019-01-23 修订日期：2019-03-18 |
| DOI： |
| 中文关键词: 亮化灯具、斜拉索、气动力参数、Strouhal数、驰振、旋涡脱落 |
| 英文关键词: lighting lamps, stay cables, aerodynamic parameters, Strouhal number, galloping, vortex shedding |
| 基金项目:大跨轻窄悬索管道桥雷诺数效应及管道覆冰气动性能研究 |
|
| 摘要点击次数: 201 |
| 全文下载次数: 0 |
| 中文摘要: |
| 安装亮化灯具后,斜拉索的气动外形发生明显改变,可能诱发不稳定振动,从而威胁结构的安全,因此有必要对安装亮化灯具的斜拉索的气动性能进行研究。本文以某大跨斜拉桥为研究背景,选取三种直径的斜拉索,通过风洞测力试验得到两种灯具安装方案在0°~360°风偏角下的阻力系数、升力系数、Strouhal数和驰振力系数,据此研究安装亮化灯具后的斜拉索的驰振特性及旋涡脱落特点。研究结果表明：由于方案一中铝槽的存在,拉索发生经典驰振的概率较大,据此提出方案二：取消铝槽,将灯具直接固定于拉索表面,研究表明,风偏角对旋涡脱落频率与强度会产生较大影响；方案二可有效减弱旋涡脱落强度,且此方案斜拉索产生驰振的概率较低。 |
| 英文摘要: |
| The aerodynamic shape of stay cable changes obviously after installing lighting lamp, which may induce unstable vibration, thus threatening the safety of structure. Therefore, it is necessary to study the aerodynamic performance of stay cable with lighting lamp. Based on the research background of a long-span cable-stayed bridge, the three-dimensional models of three diameter stay cables were designed. The drag coefficient, lift coefficient, Strouhal number and galloping force coefficient of the two installation schemes were obtained by wind tunnel tests. The galloping characteristics and vortex shedding characteristics of cables with lighting lamp were studied. The results show that the galloping probability of cable with the second scheme is low; the yaw angle has a great influence on the frequency and intensity of vortex shedding; and the second scheme can effectively reduce the strength of vortex shedding. |
|
View Fulltext
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|