双边钢主梁-UHPC组合梁涡振抑制气动措施风洞试验研究  

A wind tunnel test on aerodynamic measures for vortex-induced vibration suppression of a bilateral steel-UHPC composite beam

作　　者：贺耀北 周洋 华旭刚[1] HE Yaobei;ZHOU Yang;HUA Xugang(School of Civil Engineering,Hunan University,Changsha 410082,China;Hunan Provincial Communications Planning,Survey&Design Institute Co.,Ltd.,Changsha 410200,China)

机构地区：[1]湖南大学土木工程学院,长沙410082 [2]湖南省交通规划勘察设计院有限公司,长沙410200

出　　处：《振动与冲击》2020年第20期142-148,共7页Journal of Vibration and Shock

基　　金：湖南省科技重大专项(2017SK1010);交通运输部建设科技项目(2014033);国家自然科学基金(51422806,51278189);国家自然科学基金重大研究计划(91215302)。

摘　　要：以某大跨双边钢主梁-UHPC组合梁斜拉桥为工程背景,通过节段模型风洞试验,针对+3°风攻角最不利工况,开展了主梁涡振性能减振措施优化研究。开展了导流板、稳定板、风嘴、栏杆透风率等单一和组合气动措施主梁涡振性能减振措施优化研究。试验结果表明,该桥在试验风速范围内出现了明显的竖向与扭转涡振,且在相当大的阻尼范围内仍然存在,优化的气动措施表明设置主梁底板下的水平稳定板靠近边主梁抑振效果更明显。下中央竖向稳定板的高度和稳定板数量对涡振的抑制作用影响不明显。组合气动措施上下稳定板加人行栏杆局部封闭对主梁抑振效果最明显,涡振幅值抑制率达85%。Based on the engineering background of a long-span double-sided girder steel-UHPC composite girder cable-stayed bridge,the section model wind tunnel test was carried out to study the eddy vibration performance of the main girder in the completed state and to optimize the vibration reduction measures.The test results show that there is obvious vertical and torsional eddy vibration in the test wind speed range of the bridge and it still exists in a considerable damping range.The optimized aerodynamic measures show that the bottom plate of the main girder is set up.The vibration suppression effect of the horizontal stabilized slab near the side girder is more obvious.The height of the lower central vertical stabilizing plate and the number of stabilizing plates have no obvious effect on the suppression of vortex vibration.The vibration suppression effect of the main girder is the most obvious when the upper and lower stabilizer plates and the pedestrian railings are partially closed by combined pneumatic measures,and the suppression rate of the eddy amplitude reaches 85%.

关 键 词：大跨度桥梁 涡振 风洞试验 组合气动措施 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3