南京仙新路过江通道主桥抗风性能风洞试验研究  

Wind Tunnel Test Study on Wind Resistance of Xianxin Road River-Crossing Bridge

作　　者：于俊杰[1] 肖海珠[1] 蒋帆影 张明金[2] YU Jun-jie;XIAO Hai-zhu;JIANG Fan-ying;ZHANG Ming-jin(China Railway Major Bridge Reconnaissance&Design Institute Co.,Ltd.,Wuhan 430056,China;Department of Bridge Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中铁大桥勘测设计院集团有限公司,湖北武汉430056 [2]西南交通大学桥梁工程系,四川成都610031

出　　处：《桥梁建设》2023年第2期68-74,共7页Bridge Construction

摘　　要：仙新路过江通道主桥为跨径布置(580+1760+580)m的悬索桥,桥塔高267 m,加劲梁采用整体式闭口钢箱梁。为研究该桥运营阶段抗风性能,通过1∶50缩尺比加劲梁节段模型风洞试验分析大桥的驰振性能及提高大桥颤振性能的气动措施;通过1∶140缩尺比全桥气弹模型风洞试验,验证大桥的颤振、静风稳定性,并研究桥梁的抖振响应。结果表明:该桥在常遇风攻角范围内(-3°~+3°)不具备发生驰振的必要条件,加劲梁断面具有良好的驰振稳定性;加劲梁原始断面的颤振稳定性不满足规范要求,在中央防撞护栏间增设0.67 m高中央稳定板后,颤振临界风速高于颤振检验风速并具有一定的富余量;采用优化措施后,大桥具备良好的静风与颤振稳定性,加劲梁、桥塔在设计风速下各测点抖振响应值较小且均未发生不稳定振动或发散性振动。The main bridge of Xianxin Road River-Crossing Bridge is a suspension bridge with a main span of 1760 m and two side spans of 580 m.The towers rise 267 m.The stiffening girder consists of integral closed steel boxes.To study the wind resistance of the bridge in service stage,wind tunnel tests were carried out with a 1∶50 scale stiffening girder segment,to investigate the galloping performance and propose aerodynamic measures to improve the flutter stability of the bridge.An aeroelastic wind tunnel test was conducted with a 1∶140 scale full bridge model to verify the flutter and aerostatic stability of the bridge and study the buffeting responses of the bridge.It is shown that the stiffening girder has good galloping stability at the wind attack angles between-3°and+3°,the flutter stability of the stiffening girder of original cross-section does not meet the code requirements.After installing 0.67 m-deep central stabilizers between the crash barriers in the central median,the flutter critical wind speed becomes higher than the flutter check speed and has a certain margin.After taking optimization measures,the bridge has good aerostatic and flutter stability.Under the design wind speeds,the buffeting responses at measurement points on stiffening girder and towers are small,and no instable vibrations or diverging vibrations are observed.

关 键 词：悬索桥 钢箱梁 运营阶段 抗风性能 静风稳定性 颤振稳定性 气动措施 风洞试验 

分 类 号：U448.25[建筑科学—桥梁与隧道工程] U443.35[交通运输工程—道路与铁道工程] U441.3