雨滴冲击荷载对斜拉桥拉索风雨激振影响的初步分析

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (10) : 177-184.

论文

李锦,1，毛坤海2，余维光1，管海平1，陈水生1

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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

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摘要

为探讨雨滴冲击荷载对斜拉桥斜拉索风雨激振的影响，本文从三个方面进行了讨论。由于拉索本身的振动会影响雨滴冲击力，首先对雨滴运动与拉索振动之间的相互作用进行了分析，结果表明雨滴冲击力的大小与拉索的振动无关，可以单独考虑雨滴冲击荷载。其次，原运动方程包含水线项及拉索振动项，许多学者都对其进行过简化，本文对这些简化方法进行了比较，从风速振幅曲线来看较好，但简化使得原本简洁的运动方程复杂化，不利于运用，而本文对原始方程进行数值求解很好地解决了这一问题。最后，对影响冲击荷载的一些因素进行讨论，发现在低风速情况下，雨滴冲击荷载的影响很小，几乎可以忽略不计；而在强风环境下，随着风速的增大，雨滴冲击荷载也增大，且此时拉索振动幅值远大于无冲击荷载时拉索振幅，故此时冲击荷载不可忽略。

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.

导出引用

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[J]. Journal of Vibration and Shock, 2019, 38(10): 177-184

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