非均匀风下流线型箱梁悬索桥静风稳定性分析  

Aerostatic stability analysis of streamline box girder suspension bridge under non-uniform wind

作　　者：单秋伟 张亮亮[1,2] 言志超 杨建新[4] SHAN Qiuwei;ZHANG Liangliang;YAN Zhichao;YANG Jianxin(School of Civil Engineering, Chongqing University, Chongqing 400045, P. R. China;Chongqing Metropolitan College of Science and Technology, Chongqing 402167, P. R. China;Sichuan College of Architectural Technology, Deyang 618000, Sichuan, P. R. China;Housing and Urban-rural Construction Bureau of Lixian, Changde 415500, Hunan, P. R. China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆城市科技学院,重庆402167 [3]四川建筑职业技术学院,四川德阳618000 [4]湖南省澧县住房与城乡建设局,湖南常德415500

出　　处：《土木与环境工程学报（中英文）》2022年第1期117-125,共9页Journal of Civil and Environmental Engineering

基　　金：重庆市教委科学技术研究项目(KJZD-k201802501);重庆市技术创新与应用示范(社会民生类)一般项目(cstc2018jscx-msybX0277)。

摘　　要：大跨度悬索桥结构轻柔,风致响应明显。借助有限元方法,考虑悬索桥的几何非线性和位移荷载非线性,对非均风攻角来流沿主梁对称分布和非对称分布以及非均匀风速来流沿主梁对称分布和非对称分布时悬索桥的非线性静风稳定性展开研究。结果表明:正攻角来流会降低桥梁的静风失稳临界风速,负攻角来流有利于桥梁抵抗静风失稳,且负攻角来流对桥梁的静风稳定性影响程度比正攻角来流影响程度大;非均匀风攻角来流非对称分布时,可由小风攻角来流确定的静风失稳临界风速作为稳定性判断依据,非均匀风攻角来流对称分布时,可以选择平均攻角来流衡量桥梁的静风稳定性。非均匀风速来流对桥梁的静风稳定性有不利影响,且非均匀风速来流对称分布时的影响比非均匀风速来流非对称分布时的影响更大。在不同初始攻角下,这类来流对桥梁静风稳定性有着相似的影响,桥梁的静风失稳临界风速均随着风速非均匀程度增大而减小。The long-span suspension bridges,which are notable flexibility,are sensitive to wind load.Using the finite element method,considering the geometric nonlinearity and displacement-load nonlinearity,the aerostatic stability of suspension bridges is studied when the non-uniform wind attack angle flow and non-uniform wind speed flow distributes symmetrically and asymmetrically along the main girder.The results show that the flow of positive angle of attack will reduce the critical stability wind speed of the bridges,the flow of negative angle of attack is conducive to the bridges to resist the instability of static wind.The impact of negative angle of attack on the static wind stability of the bridge is greater than that of positive angle of attack.When the flow is asymmetrically distributed,the critical stability wind speed can be determined by small wind angle of attack.When the flow is symmetrically distributed,the mean angle of attack can be selected to measure the aerostatic stability of the bridge.Incoming flow with non-uniform wind speed has an adverse effect on the aerostatic stability of the bridge.Moreover,the influence of symmetric distribution of non-uniform wind speed is greater than that of asymmetric distribution of non-uniform wind speed.Under different initial angles of attack,this kind of incoming flow has similar effects on the static wind stability of the bridge.That's to say,the critical wind speed of aerostatic stability of the bridge decreases with the increase of the unevenness of the wind speed.

关 键 词：悬索桥 流线型箱梁 非线性 静风稳定性 非均匀风 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]