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后斜拉索的气动性能进行研究.以某大跨斜拉桥为研究背景,选取3种直径的斜拉索设计三维模型,通过风洞试验得到两种灯具安装方案的阻力系数、升力系数、Strouhal数和驰振系数,据此研究安装亮化灯具后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,发生驰振的概率较大;将灯具直接固定于拉索表面的方案二产生驰振的概率较低,但旋涡脱落强度与频率并无明显区别;风偏角对旋涡脱落频率与强度产生较大影响.研究结果可为同类型工程提供参考.
The aerodynamic shape of stay cable changes obviously after installing lighting lamp, which may induce unstable vibration and threaten 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 stay cables with three kinds of diameters are designed. Drag coefficient, lift coefficient, Strouhal number and galloping coefficient of two installation schemes are obtained by wind tunnel tests. Galloping performance and vortex shedding characteristics of stay cables with lighting lamp are studied. The results show that due to the existence of aluminum groove the first scheme has a higher probability of galloping;the second scheme, which fixes lamps directly on the surface of cables, has a lower probability of galloping, but there is no obvious difference in the intensity and frequency of vortex shedding. The wind yaw angle has a great influence on the frequency and intensity of vortex shedding.The results can provide reference for similar projects.
作者
周傲秋
余海燕
许福友
ZHOU Aoqiu;YU Haiyan;XU Fuyou(Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China)
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
2019年第4期379-384,共6页
Journal of Dalian University of Technology
基金
国家自然科学基金资助项目(51678115)
