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《深切峡谷底斜拉桥颤振稳定性能研究-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第29卷第2期山东建筑大学学报VoI.29No.22014正4月JOURNALOFSHANDONGJIANZHUUNIVERSITYApr.2014文章编号:1673—7644(2014)02—0131一O6深切峡谷底斜拉桥颤振稳定性能研究周奇,郭震山,冯云成,任鹏杰,朱乐东(1.汕头大学风洞实验室,广东汕头515063;2.桥梁结构抗风技术交通行业重点实验室,上海200092;3.中国交通建设股份有限公司第一公路勘察设计研究院有限公司,陕西西安710065;4.同济大学土木工程防灾国家重点实验室,上海200092)摘要:以峡谷底斜拉桥——迫龙沟大桥为工程背景,结合地形试验结果和大桥
2、具体位置确定了桥位处的设计风参数;分别检验了小风攻角和大风攻角下颤振稳定性能,阐明了颤振临界风速随风攻角改变的变化规律;分析了颤振导数和系统阻尼的变化特征,获得了不同结构状态下主梁断面颤振驱动机理。结果表明:峡谷底桥梁的设计基准高度可参照跨中位置确定,颤振检验风速可按不同风攻角区间分别确定;颤振临界风速和颤振检验风速随风攻角的增大均呈降低趋势,但由于下降速率不同有可能出现小风攻角下颤振不失稳而大风攻角下颤振失稳的现象;不同风攻角状态下或施加气动措施前后,颤振导数和系统阻尼与折减风速的变化特征相似,表明颤振驱动机理和颤振形态均保持不变。关键词:桥梁工程;颤振性能;风洞试验;颤振临界风速
3、;颤振驱动机理中图分类号:U441+.3文献标识码:AExperimentalstudyonflutterperformanceofcable—stayedbridgeatthebottomofadeep-cuttinggorgeZhouQi,GuoZhenshan,FengYuncheng,eta1.(1.LaboratoryofWindTunnel,ShantouUniversity,Shantou515063,China;2.KeyLaboratoryofWindResistanceTechnologyofBridgesofMinistryofTranspo~,Shanghai
4、200092,China;3.ChinaCommunicationsconstructionCompanyLtd.FirstHighwayConsultantsCo.Ltd.,Xian710065,China)Abstract:PolongValleyBridge,locatedatthebottomofadeep-cuttinggorge,wastakenastheengineeringbackgroundinthisarticle.Firstly,thedesignwindparametersofthebridgesiteweredeterminedbasedonthetopog
5、raphicexperimentresultsandthebridgelocation.Then,theflutterstabilityperformanceofthebridge,undersmallandlargewindattackangle,wasinvestigatedviathesectionalmodelwindtunneltest.Andthevariationcharacteristicsofthefluttercriticalwindspeedwiththeattackanglechanging,werealsoanalyzedinthisarticle.Fina
6、ly,theflutter—drivingmechanismofdifferentstructurestates,wasstudiedbasedontheflutterderivativesandsystemtorsionaldampingratio.Theresultsshowthat,thedesignstandardheightcanbecalculatedinthereferenceoftheelevationofmid.span,andthefluttercheckingwindspeedshouldbedeterminedindifferentwindattackangl
7、eregionsrespectively.Boththefluttercriticalwindspeedandthefluttercheckingwindspeeddecreaseswiththewindattackangleincreasing.However,becauseofdifferentdecreasingspeed,theremaybethephenomenonthatitisstabilityundersmallwindattackangl
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