Comparative study on aerodynamic stability of two kinds of suspension bridge hangers
Deng Yangchen1,2 Li Shouying1,2 Yan Jietao1,2 Chen Zhengqing1,2
1. Key Laboratory for Wind and Bridge Engineering of Hunan Province, Hunan University, Changsha 410082, China;
2. College of Civil Engineering, Hunan University, Changsha 410082, China
Abstract：The hangers on the long-span suspension bridges often vibrate under the action of wind. The wake-induced vibration caused by the aerodynamic interference between the hangers might be one of the underlying mechanisms. In order to study the influence of the surface roughness of the hanger on the aerodynamic stability, two types of model hangers with smooth and rough surfaces, which correspond to the parallel wire and steel strand hangers respectively, were made carry out wind tunnel tests to measure the mean aerodynamic force coefficients of the leeward cables. Then, according to the Routh-Hurwitz stability criterion, the aerodynamic instability regions of the parallel wire and steel strand hangers were studied and compared. The results show that there are some differences between the spatial distribution of the mean aerodynamic force coefficients for the smooth leeward cylinder and that for the rough leeward cylinder. The unstable region of the two kinds of leeward hangers appears to be a strip shape with a width of 1~2D, while the unstable region of the parallel wire hanger diverges on both sides of the center line more obviously than the steel strand hanger. The possibility of aerodynamic instability is greater in the region of 3≤X≤4, especially for steel strand hanger.
邓羊晨 李寿英 严杰韬 陈政清. 两类悬索桥吊索气动稳定性比较研究[J]. 土木工程学报, 2019, 52(1): 82-88.
Deng Yangchen Li Shouying Yan Jietao Chen Zhengqing. Comparative study on aerodynamic stability of two kinds of suspension bridge hangers. 土木工程学报, 2019, 52(1): 82-88.
