钢-混叠合窄梁驰振稳定性及抑振措施研究  

Study of Galloping Stability and Suppression Measures for Narrow Steel-Concrete Composite Girder

作　　者：宋松科 陈潜 何佳勇 张晓驰 余传锦 SONG Song-ke;CHEN Qian;HE Jia-yong;ZHANG Xiao-chi;YU Chuan-jin(Sichuan Communication Surveying and Design Institute Co.,Ltd.,Chengdu 610017,China;Department of Bridge Engineering,Southwest Jiaotong University,Chengdu 610031,China;Key Laboratory of Wind Engineering of Sichuan Province,Chengdu 610031,China)

机构地区：[1]四川省交通勘察设计研究院有限公司,四川成都610017 [2]西南交通大学桥梁工程系,四川成都610031 [3]风工程四川省重点实验室,四川成都610031

出　　处：《桥梁建设》2022年第2期60-66,共7页Bridge Construction

基　　金：国家自然科学基金项目(52008356);中国博士后科学基金项目(2020M683355);中央高校基本科研业务费专项项目(2682021CX015)。

摘　　要：为提高钢-混叠合窄梁的抗风性能,以山区大跨窄梁悬索桥——紫坪铺特大桥为背景,采用节段模型风洞试验对其加劲梁气动稳定性及其抑振措施进行研究。风洞试验观察到加劲梁原始断面在负攻角下会发生驰振发散,基于此,采用节段模型动力试验对比了调整检修道位置、调整防撞护栏透风率、设置下稳定板、设置水平导流板等气动措施的驰振抑振效果,并进一步通过节段模型静力试验进行检验。结果表明:检修道置于梁底的驰振抑振效果略好于置于桥面边缘;不同程度封闭防撞护栏或采用下稳定板反而会使结构的气动性能劣化;采用增设水平导流板及下移检修道的组合气动优化措施可大幅提高驰振临界风速,明显改善气动性能。In this paper,the Zipingpu Bridge,a long-span suspension bridge with a narrow deck located in a mountainous area,is taken as case to study how to improve the wind resistance of the narrow steel-concrete composite girder.Section model wind tunnel tests were conducted to examine the aerodynamic stability of the stiffening girder and vibration suppression measures.Galloping divergence was observed in the original cross-section of the stiffening girder at negative angles of attack.In this case,the dynamic section model test was performed to check the galloping suppression effects of multiple measures,including changing the location of the repair tracks,adjusting the penetration of the crash barriers,adding lower stabilizers and horizontal wind deflectors,and static section model test was carried out for further verification.It is shown that installing repair tracks beneath the girder soffit instead of on the deck edge can obtain better galloping suppression effect.Lowering penetration of crash barriers or adding lower stabilizers will degrade the aerodynamic performance of the structure.Implemented in combination,the measures of adding horizontal wind deflectors and lowering the repair tracks can remarkably improve the galloping critical wind velocity,thereby improving the aerodynamic performance of the narrow steel-concrete composite stiffening girder.

关 键 词：悬索桥 钢-混叠合梁 窄梁 开口断面 驰振 气动措施 节段模型 风洞试验 

分 类 号：U448.25[建筑科学—桥梁与隧道工程] U448.216[交通运输工程—道路与铁道工程]