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ID:36616571
大小:1.52 MB
页数:7页
时间:2019-05-13
《台风“海葵”作用下苏通大桥抖振全过程实测研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、桥梁建设2014年第44卷第4期(总第227期)BridgeConstruction,Vo1.44,No.4,2014(TotallyNo.227)文章编号:1003—4722(2014)04—0015—07台风“海葵"作用下苏通大桥抖振全过程实测研究王浩,程怀宇,李爱群,张宇峰(1.东南大学混凝土与预应力混凝土结构教育部重点实验室,江苏南京210096;2.江苏省交通科学研究院,江苏南京210017)摘要:为给大跨度斜拉桥的抗风设计提供参考,以苏通长江公路大桥(主跨1088m的双塔双索面钢箱梁斜拉桥)为研究对象,利用结构健康监测系统采集的台风“海葵”
2、全过程风环境和结构振动数据,采用频谱分析和数理统计方法进行了该桥风致抖振响应的实测研究。研究结果表明,该桥斜拉索和主梁的抖振加速度RMS值总体上随风速的增大而增大;就本次实测而言,该桥主梁和斜拉索的抖振加速度响应在风速大于15m/s时陡然增大,值得引起注意;与其他斜拉桥相比,该桥斜拉索在台风下的抖振响应较小,验证了其减振措施的有效性。关键词:斜拉桥;台风“海葵”;结构健康监测系统;抖振响应;加速度;频谱分析;实测中图分类号:U448.27;U441_3文献标志码:AWhole。_ProcessMeasurementofBuffetingResponse
3、ofSutongBridgeUnderActionofTyphoonHaikuiWANGHao,CHENGHuai—yu,LJAi—qun,ZHANGYu—feng(1.KeyLaboratoryofConcreteandPrestressedConcreteStructuresofMinistryofEducation,SoutheastUniversity,Nanjing210096,China;2.JiangsuTransportationResearchInstitute,Nanjing210017,China)Abstract:Toprovi
4、dereferenceforthewindresistantdesignoflongspancable—stayedbridg—es,theSutongChangjiangRiverHighwayBridge(asteelboxgirdercable—stayedbridgewithdoublepylons,doublecableplanesandwithamainspan1088m)wastakenastheresearchob—jectandthemeasurementofthewind-inducedbuffetingresponseoftheb
5、ridgewasstudiedbythespectralanalysisandmathematicalstatisticsmethods,basedonthewindenvironmentandstruc—turalvibrationdataofthewholeprocessofTyphoonHaikuiacquiredbythestrueturalhealthmo—nitoringsystem(SHMS)ofthebridge.Theresultsofthestudydemonstratethattheroot—mean—square(RMS)val
6、uesofthebuffetingaccelerationofthemaingirderandstaycablesofthebridgeincreasewiththeincreaseofthewindspeedingenera1.Asforthemeasurementforthebridgethistime,thebuffetingaccelerationresponsesofthemaingirderandstaycablesdramaticallyin—creasewhenthewindspeedexceeds15m/s,towhichattent
7、ionshouldbepaid.Comparedtooth—ercable—stayedbridges,thebuffetingresponseofthebridgeundertheactionofthetyphoonislit—tle。rifyingthatthevibrationdampingmeasurestakenforthebridgeareeffective.Keywords:cable—stayedbridge;TyphoonHaikui;structuralhealthmonitoringsystem;buf—fetingrespons
8、e;acceleration;spectralanalysis;measurement收稿日期
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