风驱雨作用下桥梁主梁颤振节段模型试验研究  

Experimental study on flutter of bridge main grider under wind-driven rain via sectional model test

作　　者：雷旭 陈政清[2] 华旭刚[2] 牛华伟[2] 韩艳[3] Lei Xu;Chen Zhengqing;Hua Xugang;Niu Huawei;Han Yan(Electric Power Science Research Institute of Guangdong Power Grid, Guangzhou, 510080, P.R.China;Wind Engineering Research Center, Hunan University,Changsha 410082, P.R.China;School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, P.R.China)

机构地区：[1]广东电网有限责任公司电力科学研究院,广州510080 [2]湖南大学风工程试验研究中心,长沙410082 [3]长沙理工大学土木工程学院,长沙410114

出　　处：《土木与环境工程学报（中英文）》2019年第2期106-115,共10页Journal of Civil and Environmental Engineering

基　　金："十二五"交通运输重大科技专项(2011318824140);中国南方电网有限责任公司科技项目(GDKJQQ20153010)~~

摘　　要：针对风驱雨作用下桥梁主梁的颤振问题,依据风驱雨作用和主梁振动特点,给出了分别考虑雨滴冲击和表面积水后的降雨相似关系,并探讨了其选取原则。选取大跨度桥梁较常采用的典型断面,通过节段模型试验模拟了风驱雨对主梁断面的颤振导数和颤振发生过程的影响。试验结果表明:主梁断面的颤振气动导数随雨强的变化无明显规律,各导数的变化量值相当,随风速增加,降雨引起的导数变化有所加大,但基本没有改变其随风速变化的整体趋势,试验雨强120mm/h时,模型颤振临界风速会有20%～30%左右的提高,但考虑雨强相似比后可以认为降雨对桥梁主梁的风致颤振失稳特征的影响基本可以忽略。Regarding the problem of bridge girder’s flutter under influence of wind-driven rain, the rainfall similarity laws are firstly established in terms of raindrop impact and surface ponding respectively, according to the characteristics of wind-driven rain and bridge main girder’s vibration, besides, the selection principle is also discussed. Then, several typical main girder sections, which are frequently used in long-span bridges, are selected as examples to investigate the influence of wind-driven rain on flutter derivatives and flutter occurrence process by sectional model tests. Results show that there is no significant regularity between the flutter aerodynamic derivatives of the main girder and the rainfall intensity, as the variation of each derivative is almost the same. Comparatively, the variation of derivative caused by rainfall is increased with the wind speed. However, the general variation trend of the flutter aerodynamic derivatives with wind speed is not changed. When the test rain intensity is 120 mm/h, the critical wind speed of the flutter model raises about 20%~30%. Considering the similarity law proposed in this paper, the effect of rainfall on wind-induced flutter characteristics can be ignored.

关 键 词：桥梁主梁 风驱雨 相似比 颤振导数 临界风速 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]