考虑吊索阻尼比影响的悬索桥抖振响应分析  

Analysis of Buffeting Response of Suspension Bridge with Consideration of the Effect of Sling Damping Ratio

作　　者：刘韡[1] 吴静宇 张卫喜[1] Liuwei;Wujingyu;zhangweixi

机构地区：[1]西安建筑科技大学理学院,西安710055

出　　处：《建设科技》2020年第15期92-96,共5页Construction Science and Technology

基　　金：11872287,项目名称:微波辅助混凝土骨料资源化回收中的多场效应研究。

摘　　要：目前对大跨度悬索桥抖振响应的分析中,往往忽略了吊索阻尼比的影响。本文在考虑吊索阻尼比的情况下研究悬索桥抖振响应,采用了自由振动衰减法计算不同长度、初张力、直径、风速下的吊索阻尼比,分析吊索阻尼比与总阻尼比间的关系,构建了单吊索—主梁阻尼模型,最终由抖振分析计算出吊索阻尼比对悬索桥抖振位移均方差的影响。结果表明,悬索桥跨中位移随着吊索长度的增加而增大,随着吊索初张力的增大而增大,随着吊索直径的增大而减小,风速对悬索桥抖振响应有较大的影响,随着风速的增加而增大,且基本呈线性增长。因此在计算和设计悬索桥时,必须考虑吊索阻尼比的影响。In the analysis of buffeting response of long-span suspension bridge at present, the influence of sling damping ratio is often ignored. Considering sling damping ratio, this paper studies the buffeting response of suspension bridge using the free vibration attenuation method to calculate the sling damping ratio under different length, initial tension, diameter and wind speed. The relationship between sling damping ratio and total damping ratio is analyzed, and the single sling girder is constructed and finally the influence of sling damping ratio on the mean square deviation of buffeting displacement of suspension bridge is calculated by buffeting analysis. The results show that the mid span displacement of suspension bridge increases with the increase of sling length, the initial tension of sling and the diameter of sling. The wind speed has a great influence on the buffeting response of suspension bridge, and increases with the increase of wind speed, which is basically linear growth. Therefore, in the calculation and design of suspension bridge, the influence of sling damping ratio must be considered.

关 键 词：钢桁架悬索桥 自由振动衰减法 吊索阻尼比 有限元分析 抖振响应 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]