边箱钢-混叠合梁颤振性能及气动措施研究  

Flutter performance and aerodynamic measures of a suspension bridge with side box steel-concrete composite girder

作　　者：董佳慧 周强 马汝为 王骑[1,2] 廖海黎 DONG Jiahui;ZHOU Qiang;MA Ruwei;WANG Qi;LIAO Haili(Research center for wind engineering,Southwest Jiaotong University,Chengdu,610031,China;Key Laboratory for Wind Engineering of Sichuan Province,Chengdu,610031,China)

机构地区：[1]西南交通大学风工程试验研究中心,成都610031 [2]风工程四川省重点实验室,成都610031

出　　处：《振动与冲击》2020年第3期155-160,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金(51708462;51778547)

摘　　要：为了研究边箱钢-混叠合梁悬索桥的颤振性能,以某大跨度悬索桥为背景,通过一系列节段模型风洞试验,研究了边箱钢-混叠合梁悬索桥的颤振形态及特性,并详细分析了上、下中央稳定板、水平导流板、裙板、锐化风嘴等气动措施对其颤振性能的影响。结果表明:边箱钢-混叠合梁颤振呈现以扭转为主、单一频率振动的弯扭耦合振动特征,即出现软颤振现象,且振动频率与系统扭转频率相近;通过气动优化研究发现,对于边箱钢-混叠合梁,中央稳定板对于提高其颤振临界风速的作用有限,而水平导流板与裙板组合气动措施的作用效果明显,可显著提高其颤振临界风速。此外,锐化风嘴亦可改善边箱钢-混叠合梁颤振性能。In order to investigate flutter performance of a suspension bridge with side box steel-concrete composite girder,taking a certain large-span suspension bridge as background,a series of wind tunnel tests were conducted for a 1∶50 segment model to study the bridge’s flutter form and features,and analyze effects of aerodynamic measures including upper and lower central stabilizing plates,horizontal guide plate,skirt plate and sharpened nozzle on its flutter performance in detail.The results showed that flutter of side box steel-concrete composite girder reveals a torsional dominant and single frequency torsional-bending coupled vibration,i.e.,soft flutter phenomenon occurs and vibration frequency is close to the system’s natural torsional frequency.The aerodynamic optimization study showed that for side box steel-concrete composite girder,central stabilizing plate has finite effects on increase in its flutter critical wind speed,while the effect of horizontal guide plate and skirt one’s combined aerodynamic measure is obvious to significantly increase the girder’s flutter critical wind speed;sharpened nozzle can also improve flutter performance of side box steel-concrete composite girder.

关 键 词：边箱钢-混叠合梁 悬索桥 软颤振 气动措施 节段模型 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]