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1、橋梁建設(shè)2015年第45卷第3期(總第232期)BridgeConstruction,Vo1.45,No.3,2015(TotallyNo.232)13文章編號:1003~4722(2015)03—0013一O7大跨度斜拉橋斜拉索阻尼減振技術(shù)研究進(jìn)展汪正興h,王波,柴小鵬,(1.中鐵大橋局集團(tuán)橋科院有限公司,湖北武漢430034;2.橋梁結(jié)構(gòu)安全與健康湖北省重點實驗室,湖北武漢430034)摘要:斜拉索振動機(jī)理復(fù)雜且危害嚴(yán)重,需要采取附加阻尼技術(shù)抑制斜拉索的振動,對斜拉索的振動特性和阻尼器的減振機(jī)理進(jìn)行研究總結(jié)。首先計算34座斜拉橋最長索的Scruton數(shù),與已有的理論分析、
2、風(fēng)洞試驗結(jié)果進(jìn)行對比分析,并采用工程實踐結(jié)論進(jìn)行驗證,確定了斜拉索可能發(fā)生的渦激振動、風(fēng)雨振、參數(shù)共振和內(nèi)共振、尾流馳振等各自對應(yīng)的抑振目標(biāo)阻尼參數(shù);然后對常見阻尼器的阻尼作用機(jī)理、位移傳遞形式、耐久性分別進(jìn)行對比分析,提出各種阻尼器的適用范圍,并從作用機(jī)理和試驗驗證兩方面重點介紹了杠桿質(zhì)量阻尼器的減振效率的優(yōu)越性;最后提出斜拉索阻尼減振技術(shù)進(jìn)一步的研究方向。關(guān)鍵詞:斜拉橋;斜拉索;振動特性;減振機(jī)理;阻尼參數(shù);杠桿質(zhì)量阻尼器;振動控制中圖分類號:U448.27;TU311.3文獻(xiàn)標(biāo)志碼:AResearchAdvancementofDampingTechniquesforSt
3、ayCablesofLongSpanCable--StayedBridgesWANGZhengxing~。WANGBo~.CHAIXiao—peng,(1.BridgeScienceResearchInstituteLtd.,ChinaRailwayMajorBridgeEngineeringGroup,Wuhan430034。China;2.KeyLaboratoryofBridgeStructureSafetyandHealthofHubeiProvince,Wuhan430034,China)Abstract:Thevibrationmechanismofthestay
4、cablesoflongspancable—stayedbridgesiscom—plex,thehazardsofthevibrationaresevereandtherefore,theadditionaldampingtechniquesneedtObeappliedtOsuppressthevibration.Inthispaper,theresearchesofthevibrationcharacteristicsO±thestaycablesandvibrationsuppressionmechanismofthedampersapplicabletothesta
5、ycablesaresummarized.TheScrutonnumbersofthelongeststaycablesof34cable-stayedbridgesarefirstlycollectedandcalculated.ThecalculationsoftheScrutonnumbersareanalyzedandcomDaredtotheexistingtheoreticanalysisandwindtunneltestresults,areverifiedbytheconc1usionsfromtheimplementedprojectsandthetarge
6、tdampingparametersforthevibrationsuppressionCOrre—spondingtoeachpotentialvortex-inducedvibration,rainvibration,parameterresonance,interna1resonanceandwakegallopingaredetermined.Thenthedampingactionmechanism,displacementtransfertypesanddurabilityofthecommondampersarerespectivelyanalyzedandco
7、mparedandtheapplicablerangesofthedifferentdampersareputforward.Finally,inthetwoaspectsoftheactionmechanismandtestverification,theadvantagesofthedampingefficiencyofthe1evermassdamper(LMD)areparticularlyintroducedandthefurtherresearchfieldsofthedampingtech