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1、外文原文DynamicbehaviorandstabilityoftransmissionlinetowersunderwindforcesRonaldoC.Battistaa,b,RosângelaS.Rodriguesa,MichèleS.PfeilaaCivilEngineeringProgram,COPPE–UniversidadeFederaldoRiodeJaneiro,CP68506,RiodeJaneiro,CEP21945-970,BrazilbCOPPETECResearch,Consulting&Design,CP68506,RiodeJaneiro,CEP219
2、45-970,BrazilAbstractAnewanalytical-numericalmodellingforthestructuralanalysisoftransmissionlinetowers(TLT)underwindactionispresentedandproposedasarationalprocedureforstabilityassessmentinadesignstage.Thenumericalresultsobtainedfroma3Dfiniteelementmodelarediscussedinrelationtothedynamicbehaviora
3、ndthemechanismofcollapseofatypicalTLT.Asimplifiedtwodegree-of-freedomanalyticalmodelisalsopresentedandshowntobeausefultoolforevaluatingthesystemfundamentalfrequencyinearlydesignstages.InordertoreducetheTLT’stophorizontalalong-winddisplacementsinthecross-linedirection,nonlinearpendulum-likedamper
4、s(NLPD)installedonthetowersareenvisagedandtheirefficiencyisdemonstratedwiththeaidofcomparisonsbetweennumericalresultsobtainedfromthecontrolledandtheuncontrolledsystems.©2003ElsevierLtd.Allrightsreserved.Keywords:Transmissionline;Stability;Dampers;Windforce;Dynamics;Steeltower1.IntroductionAnewan
5、alytical-numericalmodelinghasbeenappliedtoachosentypeofsteeltransmissionlinetowers(TLT):aconventional32.86m-highself-supportingtower.ThestructuralmodelingofthechosenTLTisbasedonobservationofthesystem’sbehaviorandvideoimagesofsomerecentaccidentsinBrazil,whenstormwindvelocitiesreachedvaluescloseto
6、100km/h.Thedynamiccharacteristicsofthetowersandthelateralmovementoftheelectriccableshavebroughtuptheimportanceoffluidflow–cables–structureinteractionwhenevaluatingthetowersbehaviorundertheactionofwindforces,leadingtothenewanalytical-numericalmodellingforthestructuralanalysisofTLT’s,asoriginallyp
7、roposedbyRodrigues[1]andRodriguesetal.[2]and,almostsimultaneously,byYasuietal.[3]analyzingthedifferencesinthebehaviorofpowerlinessupportedbytension-orsuspensiontypetransmissionlinetowers.Theoverallresultsfromtheperformedanal
