不同降雨环境下的斜拉索风雨激振响应研究  

Research on the rain wind induced vibration responses of stay cables considering different rainfall environments

作　　者：李锦华[1] 张焕涛 杨文明[2] 余维光 李春祥[3] Li Jinhua;Zhang Huantao;Yang Wenming;Yu Weiguang;Li Chunxiang(Department of Civil Engineering,East China Jiaotong University,330013,Nanchang,China;China Railway Bridge Group First Engineering Co.Ltd.,450053,Zhengzhou,China;Department of Civil Engineering,Shanghai University,200444,Shanghai,China)

机构地区：[1]华东交通大学土木建筑学院,南昌330013 [2]中铁大桥局集团第一工程有限公司,郑州450053 [3]上海大学土木工程系,上海200444

出　　处：《应用力学学报》2020年第4期1709-1716,I0023,共9页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(51778354,11962006);江西省自然科学基金(20171BAB206051)。

摘　　要：研究了非稳态风荷载以及不同降雨环境下雨滴冲击对拉索振动的影响。建立了考虑非稳态风和雨滴冲击的斜拉索风雨激振响应方程;通过谐波叠加法模拟了非稳态风荷载;分析了不同降雨环境下非稳态风荷载以及不同降雨环境下雨滴冲击对拉索振动的影响。研究结果表明:在非稳态低风速作用下,拉索风雨激振振幅随着风速的增大先增大后减小,在9m/s^11m/s和13m/s^15m/s风速内,考虑非稳态风作用的拉索振幅大于稳态平均风作用的拉索振幅;在拉索风雨激振风速9m/s^13.5m/s内,考虑雨滴冲击的拉索振幅明显大于无雨滴冲击的拉索振幅,而在此以外的强风环境下,可认为强风速导致雨滴沿着碰撞点表面的切线方向脱离拉索,而不形成水线运动轨迹,拉索仅受到雨滴冲击与风荷载共同作用。This paper studies the influence of unsteady wind load and raindrop impact on cable vibration in different rainfall environments. Firstly, the response equation of rain-wind induced vibration of stay cable is established considering the impact of unsteady wind and raindrop. Secondly, the unsteady wind load is simulated by harmonic superposition method. Finally, influences of unsteady wind load and raindrop impact on the vibration of stay cable under different rainfall environment are analyzed. Results show that:(1)In the low wind speed environment, the wind-rain-induced vibration amplitude of the cable considering the unsteady wind increases firstly and then decreases with the increase of wind speed, and when the wind speed is in the range of 9 m/s^11 m/s and 13 m/s^15 m/s, the amplitude of cable considering unsteady wind is larger than that of steady average wind.(2)In the wind speed range of 9 m/s^13.5 m/s, the amplitude of cable considering raindrop impact is larger than that without raindrop impact. In other strong wind environments, it can be considered that strong wind speed causes raindrops to leave the cable along the tangent of the impact point surface without forming a waterline motion trajectory. At this point, the cable is only affected by raindrop impact and wind load.(3)The amplitude of the cables under different rainfall environments increases with the increase of rainfall intensity.

关 键 词：雨滴冲击 非稳态风 降雨强度 拉索振幅 

分 类 号：TU311[建筑科学—结构工程]