摘要
为研究边主梁断面钢-混结合梁悬索桥后颤振特性,以某三塔四跨边主梁断面钢-混结合梁悬索桥为背景,对1∶60钢-混结合梁缩尺节段模型开展风洞试验,分析其颤振稳定性及后颤振响应特征,并研究结构阻尼、气动措施及阻尼-气动组合措施对钢-混结合梁后颤振响应特征的影响。结果表明:节段模型在负风攻角下颤振稳定性较好,但在正风攻角下易发生后颤振,颤振临界风速较低,极限环振动稳态振幅随风速增大而增大,且增长较快;后颤振响应具有明显的弯扭耦合特征,且竖向振动参与程度随风速增大而增大,耦合振动频率随风速增大而减小,在正风攻角下相位差为10°~40°,在0°风攻角下相位差可以忽略;增加结构阻尼或安装气动措施均能有效提升钢-混结合梁颤振起振和临界风速,其中气动措施的提升效果更显著,且两者控制效果可以叠加。
This paper focuses on the post-flutter characteristics of the suspension bridge with stiffening girder comprising steel edge boxes and concrete panels.Based on an existing three-tower,four-span suspension bridge with such type of stiffening girder,a 1∶60 scale-down sectional model was prepared for wind tunnel tests,to analyze the flutter stability and post-flutter characteristics of the composite girder of steel edge boxes and concrete panels.And further studies were carried out to analyze the effects of three types of wind-induced vibration mitigation measures on the flutter responses of the composite girder of steel edge boxes and concrete panels,including installing dampers,optimizing aerodynamic shape and the combined utilization of dampers and aerodynamic shape optimization.It is shown that the segmental model exhibits sound flutter stability at negative angles of wind attack,while prone to post flutter at positive angles of wind attack,seeing low flutter critical wind velocities and rapid rise of the steady-state amplitude of the limit cycle oscillation(LCO)along with the increase of wind velocity.The post flutter responses display distinctive bending-torsion coupling,as the wind velocity increases,the participation of vertical vibrations becomes more active in the coupling,but the coupling vibration frequency become lower as the wind velocity increases.At the positive angles of wind attack,the phase difference range is between 10°and 40°,while at the 0°wind attack,the phase difference is negligible.Adding dampers or optimizing aerodynamic shape can effectively improve the flutter initiation and critical wind velocities,and the effect of aerodynamic shape optimization is more significant,and the flutter control effect of dampers and aerodynamic shape optimization can be superimposed.
作者
刘曙光
黄智文
肖晨
LIU Shuguang;HUANG Zhiwen;XIAO Chen(China Railway Major Bridge Reconnaissance&Design Institute Co.,Ltd.,Wuhan 430056,China;Key Laboratory of Wind and Bridge Engineering of Hunan Province,Hunan University,Changsha 410082,China;Wuhan City Public Facilities Operation Management Group Co.,Ltd.,Wuhan 430064,China)
出处
《桥梁建设》
EI
CSCD
北大核心
2023年第S02期79-87,共9页
Bridge Construction
关键词
悬索桥
边主梁断面钢-混结合梁
节段模型
后颤振特性
结构阻尼
气动措施
风洞试验
suspension bridge
composite girder of steel edge boxes and concrete panels
sectional model
post-flutter characteristics
damper
aerodynamic measure
wind tunnel test
作者简介
刘曙光,1984—,男,高级工程师,2008年毕业于武汉理工大学道路桥梁与渡河工程专业,工学学士,2011年毕业于武汉理工大学道路与铁道工程专业,工学硕士。研究方向:桥梁设计、诊治与维修加固,E-mail:406012883@qq.com;黄智文,1986—,男,副教授,2009年毕业于湖南大学桥梁与隧道工程专业,工学学士,2016年毕业于湖南大学桥梁与隧道工程专业,工学博士。研究方向:大跨度桥梁风致振动与结构振动控制,E-mail:zwhuang213@hnu.edu.cn;肖晨,1985—,女,高级工程师,2008年毕业于华中科技大学道路桥梁与渡河工程专业,工学学士。研究方向:大跨度桥梁运营管养、检测评估及养护维修,E-mail:271542790@qq.com
