窄幅边主梁斜拉桥涡振性能及气动控制措施研究  

Vortex induced vibration performance and aerodynamic control measures of cable stayed bridge with narrow side girder

作　　者：李春光 毛禹 韩艳 颜虎斌 LI Chunguang;MAO Yu;HAN Yan;YAN Hubin(School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114

出　　处：《铁道科学与工程学报》2022年第5期1347-1354,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学优秀青年基金资助项目(51822803);国家自然科学基金资助项目(51678079,51778073,51978087);湖南省自然科学基金资助项目(2020JJ14607)。

摘　　要：为研究窄幅边主梁断面的涡振性能及其气动控制措施,以某窄幅边主梁斜拉桥为工程背景,开展1︰20节段模型的测振及气动控制措施优化风洞试验,研究不同角度风嘴对称及非对称布置形式、梁底稳定板数量、风嘴水平分流板等气动措施对主梁涡振性能的影响。研究结果表明:窄幅边主梁涡振性能较差,在0°,±3°风攻角下均发生了显著的竖弯涡振,但未发生扭转涡振,最大响应振幅出现在+3°攻角,峰值位移132.2 mm,超出规范允许值152%。安装非对称风嘴对主梁涡振抑制效果更明显,设置风嘴能使主梁断面接近流线型,从而改善其气动性能。风嘴角度越小,抑振效果越好,但风嘴对主梁涡振性能提高有限。梁底稳定板对边主梁涡振的抑制效果明显,涡振风速区间不变,竖向涡振振幅得到明显抑制。随着稳定板的数目增加,主梁涡振稳定性提高越明显,但对主梁在不同风攻角下涡振性能的改善存在较大差异,+3°攻角下涡振响应降低为原断面响应的50%,但仍超规范限值。0°攻角下主梁的涡振得到完全抑制。在边主梁梁底两侧1/4处设置稳定板并在风嘴处设置分流板能有效抑制主梁发生涡激共振。In order to study the vortex induced vibration(VIV)performance and aerodynamic control measures of the narrow side main beam,taking a cable-stayed bridge with a narrow side main beam as the engineering background,the wind tunnel test of vibration measurement and aerodynamic control measures optimization of a 1:20 section model was carried out.The effects of aerodynamic measures such as symmetrical and asymmetric arrangement of wind fairing with different angles,the number of stabilizing plates at the bottom of the beam and horizontal splitter plates of wind fairing on the vortex vibration performance of the main beam were studied.The results show that the VIV performance of the narrow side main beam is poor.Significant vertical bending vortex vibration occurs at 0°and±3°wind attack angle,but torsional vortex vibration does not occur.The maximum response amplitude appears at+3°attack angle,and the peak displacement is 132.2 mm,which exceeds the allowable value of the specification by 152%.The installation of asymmetric wind fairing has more obvious suppression effect on the VIV of the main beam.The installation of wind fairing can make the section of the main beam close to the streamline,so as to improve its aerodynamic performance.The smaller the angle of the wind fairing,the better the vibration suppression effect.The improvement of the vortex vibration performance of the main beam is limited.The VIV of the side main beam is obviously restrained by the stable plate at the bottom of the beam.The VIV wind speed range remains unchanged,and the vertical VIV amplitude is obviously restrained.With the increase of the number of stabilizing plates,the VIV stability of the main beam is improved more obviously,but there is a great difference in the improvement of the VIV performance of the main beam at different wind angles of attack.The VIV response at+3°angle of attack is reduced to 50%of the original section response,but it still exceeds the specification limit.The VIV of the main beam is completely suppressed at

关 键 词：窄幅边主梁 涡振性能 气动控制 风嘴形式及角度 

分 类 号：U447[建筑科学—桥梁与隧道工程]