大跨长挑臂钢箱组合梁桥抗风性能试验研究  

Experimental Study on Wind Resistance of Long-Span Steel Box Composite Girder Bridge with Long Cantilevers

作　　者：王彬[1,2] 刘来君 刘志文[3] WANG Bin;LIU Laijun;LIU Zhiwen(School of Highway,Chang′an University,Xi′an 710064,China;Shanxi Transportation Science Highway Survey and Design Institute Co.,Ltd.,Taiyuan 030032,China;Hunan Provincial Key Lab for Wind Engineering&Bridge Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]山西交科公路勘察设计院有限公司,山西太原030032 [3]湖南大学风工程与桥梁工程湖南省重点实验室,湖南长沙410082

出　　处：《桥梁建设》2024年第2期99-105,共7页Bridge Construction

基　　金：山西交控集团科技项目(2021-JKKJ-6)。

摘　　要：为了解大跨长挑臂钢箱组合梁桥抗风性能及选取合适的声屏障形式,以挑臂长7.5 m的钢箱组合梁桥——临猗黄河大桥为背景,基于有限元计算的施工及成桥阶段桥梁动力特性指标,制作1个缩尺比1∶50的最大悬臂施工状态钢箱梁、2个缩尺比1∶60的成桥状态不同声屏障设置形式(直线形、折线形,高度均为2.5 m)钢箱组合梁节段模型进行风洞试验,分析施工和成桥状态主梁断面的涡振、颤振和驰振性能。结果表明:施工状态的钢箱梁抗风稳定性良好,涡振、颤振和驰振性能均满足设计要求;常遇风攻角为0°、±3°时,成桥状态下,设置2.5 m高折线形声屏障可有效抑制主梁涡振响应,且颤振与驰振稳定性均满足规范要求;设置2.5 m高直线形声屏障的主梁发生明显的竖向涡振现象。该桥主梁最终采用2.5 m高折线形声屏障。The study focuses on the wind resistance of the long-span steel box composite girder bridge with long cantilevers and the proper noise barriers for such type of bridge.The Linyi Huanghe River Bridge,which is a steel box composite girder bridge featuring its 7.5 m-wide cantilevers,is used as a case.The dynamic properties of the bridge during construction and at service stage were numerically simulated.A 1∶50 sectional models of the steel box composite girder under construction and two 1∶60 sectional models of steel box girders with 2.5 m-deep straight and polyline noise barriers,respectively,at service stage,were prepared for wind tunnel tests,to analyze the vortex-induced vibrations(VIVs),flutter and galloping performance of the superstructure during construction and at service stage.It is shown that the steel box girders exhibited sound wind resistance during construction,with required capacities to resist VIVs,flutter and galloping.At wind attack angles of 0°,+3°and-3°,significant VIVs were observed in the superstructure fitted with 2.5 m-deep straight noise barriers,while the superstructure fitted with 2.5 m-deep straight noise barriers showed suppressed vortex-induced vibrations,and sound flutter and galloping stability.The 2.5 m-deep polyline noise barriers were finally selected for the Linyi Huanghe River Bridge.

关 键 词：钢箱组合梁 长挑臂 节段模型 声屏障 涡振 颤振 驰振 风洞试验 

分 类 号：U443.35[建筑科学—桥梁与隧道工程] U446.1[交通运输工程—道路与铁道工程]