Study on the Influence of Wind Fairing Parameters on the Aerodynamic Performance of Long-Span Double-Deck Steel Truss Suspension Bridge

被引:0
|
作者
Yang, Yang [1 ]
Li, Long [1 ]
Yao, Gang [1 ]
Wu, Bo [2 ]
Wang, Dawu [3 ]
Yu, Hui [3 ]
Qu, Hao [3 ]
机构
[1] Chongqing Univ, Sch Civil Engn, Chongqing 400045, Peoples R China
[2] Chongqing Jiaotong Univ, Sch Civil Engn, Chongqing 400074, Peoples R China
[3] Chongqing Railway Grp Co Ltd, Chongqing 400015, Peoples R China
基金
中国国家自然科学基金;
关键词
double-deck steel truss girder; aerodynamic performance; wind fairing; wind tunnel test; numerical simulation; RECTANGULAR; 5/1; CYLINDER; VORTEX-INDUCED VIBRATION; BOX-GIRDER; ANGLE;
D O I
10.3390/buildings14072255
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
A long-span double-deck steel truss suspension bridge is easy to produce vortex-induced vibration (VIV) at low air velocity, which affects bridge service life. Additional aerodynamic measures play a role in suppressing VIV by changing the aerodynamic shape, which is a common control method. As the main aerodynamic measure to suppress the VIV response, wind fairing is widely used in engineering practice. In order to obtain the optimal additional position and shape parameters of the fairing, Huangjuetuo Yangtze River Bridge is the research target. Through the combination of a wind tunnel test and numerical simulation, the VIV response of the original and fairing section is studied. Based on data analysis, it is revealed that these additional fairings to the upper chord can significantly reduce the VIV response. When the shape parameters of the fairing are h/D = 1/4 and l/D = 1, the VIV inhibition efficiency is the highest, which can reach 65.51%. By analyzing the flow distribution, it can be seen that VIV is caused mainly by vortex separation in the upper bridge board area. Although this wind fairing does not change the original vortex shedding forms, it changes the first separation point and movement direction of the airflow, making the vortex scale generated by the airflow smaller and the vorticity lower, thus effectively suppressing VIV.
引用
收藏
页数:17
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