Preliminary analysis on the influence of raindrop impact loads on the cable rain-wind-induced vibration of cable-stayed bridges
LI Jinhua1,MAO Kunhai2,YU Weiguang1,GUAN Haiping1,CHEN Shuisheng1
1.Department of Civil Engineering, East China Jiaotong University, Nanchang 330013, China
2.Nanchang Railway Tianhe Construction Co,Ltd,Nanchang 330026,China
Abstract:In order to investigate the effect of raindrop impact loads on the rain-wind-induced vibration of stay cables of cable-stayed bridges, three aspects were discussed, namely the interaction, modification and influential factors.As the vibration of the cable itself affects the impact force of the raindrops, the interaction between the raindrop impact and cable was analyzed in detail.The results show that the impact force of the raindrops is independent of the vibration of the cable, and the raindrop loads can be considered separately.Secondly, the brief original motion equations implicitly contain the vibration of rivulets and cable, and is difficult to solve, so many scholars have modified them.In the paper, some modified methods were compared through their results, and the solved curves of the wind speed amplitude display rather perfect characters.But the modification makes the original compact motion equation become very complicated and not conducive to be used.This paper presents the numerical solution for the original equation without any modification.Finally, some influenctial factors for the impact loads were studied.It is found that the impact loads of the raindrops are very small and almost could be negligible under the condition of low wind speed.However, in the strong wind environment, the impact load of the raindrops increases with the increase of the wind speed, and the amplitude of the cable vibration is far greater than that without impact loads, so in this case the impact load can not be ignored.
李锦,1,毛坤海2,余维光1,管海平1,陈水生1. 雨滴冲击荷载对斜拉桥拉索风雨激振影响的初步分析[J]. 振动与冲击, 2019, 38(10): 177-184.
LI Jinhua1,MAO Kunhai2,YU Weiguang1,GUAN Haiping1,CHEN Shuisheng1. Preliminary analysis on the influence of raindrop impact loads on the cable rain-wind-induced vibration of cable-stayed bridges. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(10): 177-184.
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