Abstract：To investigate the effects of the surface roughness and the Reynolds number on the wake-induced aeroelastic instabilities of parallel cables, two staggered circular cylinders with a center-to-center distance of 4 were studied by wind tunnel tests. The incidence angle α varied from 0° to 20°, and the Reynolds number Re ranged from 18000 to 168800. The vibration conditions, maximum amplitudes, and vibration trajectories of the downstream cylinder were discussed. The effects of surface roughness, Reynolds numbers, and damping ratios on wake-induced instabilities were analyzed. The results show that two types of aeroelastic instabilities, namely, the wake-induced galloping and the wake-induced flutter, can be found; an increased damping ratio has an obvious suppression effect on wake-induced galloping but has little effect on wake-induced flutter. The Reynolds number effects are observed, differently with the transition from the wake-induced galloping to wake-induced flutter at certain conditions. Besides, the larger surface roughness of the upstream cylinder has limited influence on the wake-induced aeroelastic instabilities. While for larger surface roughness of the downstream cylinder, the possibilities for the wake-induced aeroelastic instabilities decrease obviously; the phenomenon of divergent aeroelastic instability transforms into a “limited-amplitude and limited-velocity” vibration.
杜晓庆 吴葛菲 林伟群 代钦. 缆索承重桥并列索尾流致气弹失稳研究[J]. 土木工程学报, 2020, 53(8): 57-63.
Du Xiaoqing Wu Gefei Lin Weiwun Dai Qin. Study on wake-induced aeroelastic instabilities of #br#
parallel cables in cable-supported bridges. 土木工程学报, 2020, 53(8): 57-63.
