亮化灯具对既有斜拉索风致振动影响的试验研究

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (6) : 44-50.

论文

邓周全1，唐浩俊1，李永乐1，黄静2，王义超1，林太乙2

作者信息 +

Experimental research on the wind-induced vibration of stay cables with lighting fixtures

DENG Zhouquan1，TANG Haojun1，LI Yongle1，HUANG Jing2，WANG Yichao1，LIN Taiyi2

Author information +

文章历史 +

摘要

为了装点城市夜景，对既有大跨度斜拉桥进行光彩亮化改造已成为一种趋势，但是安装照明灯具将显著改变斜拉索的气动形状，影响结构气动稳定性。为保证结构的安全及耐久性，通过风洞试验研究了安装灯具后斜拉索的抗风性能，评价亮化灯具对既有斜拉索产生的影响。以三种不同管径斜拉索为研究对象，制作了几何缩尺比为1∶1的节段模型，开展了测力和测振的风洞试验。研究结果表明：灯具的存在将显著改变斜拉索的气动外形，提高其背风侧漩涡脱落的频率，使斜拉索在更低的来流风速下就具备发生涡激共振的可能性。此外，灯具对斜拉索风雨激振的影响较为有限，对斜拉索干索驰振有一定的抑制作用。

Abstract

In order to decorate cities' night view, it has become a trend to install lighting fixtures on the existing long-span cable-stayed bridge.But, the installation of lighting fixtures will significantly change the aerodynamic shape of stay cables, affecting the structural aerodynamic stability.In order to ensure the safety and durability of bridges, the wind resistance of a stayed cable installed with lighting fixtures was studied bymeans of wind tunnel tests, and the influence of the lighting fixtures on the existing stay cable was evaluated.Taking three different diameter stay cables as the research object, wind tunnel tests for force and vibration measurement were carried out around a segment model with a scale ratio of 1∶1.The experimental results show that the presence of lighting fixtures will significantly change the aerodynamic shape of stay cables, increasing the frequency of vortex shedding at the leeward side, so that stay cables have the possibility of vortex-induced resonance at a lower inflow wind speed.In addition, the influence of lighting fixtures on the rain vibration of stay cables is finite, and it has a certain inhibitory effect on dry galloping.

导出引用

邓周全1，唐浩俊1，李永乐1，黄静2，王义超1，林太乙2. 亮化灯具对既有斜拉索风致振动影响的试验研究[J]. 振动与冲击, 2020, 39(6): 44-50

DENG Zhouquan1，TANG Haojun1，LI Yongle1，HUANG Jing2，WANG Yichao1，LIN Taiyi2. Experimental research on the wind-induced vibration of stay cables with lighting fixtures[J]. Journal of Vibration and Shock, 2020, 39(6): 44-50

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