鋼管組合大跨越輸電塔線體系抗震減震分析研究.pdf

1、廣州大學碩士學位論文鋼管組合大跨越輸電塔線體系抗震減震分析研究姓名：曹枚根申請學位級別：碩士專業(yè)：防災減災工程及防護工程指導教師：徐忠根20060508廣州大學丁學碩士學位論文AbstractTowerswithLargeCrossingTransmissionlines(TLCTL)arehighriseandlongspanstructuralsystems，whicharewidelyusedimportantlifelinepo

2、werengineeringestablishmentIthasimportanteconomicandSOcialsignificancetoremainTLCTLsmainstructuressafeandreliableunderaccidentalearthquakeTLCTLiS3一dimensionalcomplicatedtower—linecoupledvibrationsystemwhichhaveanobviousc

3、haracteristiciScontinuumthatitconsistsofhigh—risesteeltowersandlongspantransmissionlinesAtpresent，thehigh—voltagetransmissiontowerswhichareTLCTLsmainsupportingparts，areusuallyassembledbysteelanglesathomeandabroadLatelyst

4、eeltubetowersandcombosteeltubetowersareextensivelyadoptedintransmissionlineengineeringbecausesteeltubeshavegoodsectionalmechanicalpropertyandbeautifulexternalshapes刀)emainreasontocausetransmissiontowertobefailedisdynamic

5、actionbesidesstaticloadSotoensureTLCTLsafeandreliableunderaccidentalearthquakeispaidmoreandmoreattentiontobyengineersandresearchersWithANSYS，afinite—element—methodprogram，itisestablishedanewanalytical—numericalmodelcombi

6、ningbeamandtrusselementsofcombosteeltubeTLCTL，whichisonepractical220kVtransmissionlineeElga。neeringoverPearlRiverDynamiccharacteristicsoftheTLCTLandsingletowersaleanalyzedbysubspaceiterationmethodBycomparingthefirstperio

7、doftheoreticvaluewiththatofapproximateformulavalue，arevisedapproximateformulatoestimatethe220SZK’SfrecvibrationperiodwithoutcablesisgainedwhichimproveresultaccuracyThen，byanalyzingparameterofthe1rICTL，sdynamiccharacteris

8、ticsandsingletowerqualitativecoupledeffectsofthetransmissionlinesontowersalongtransverseandlongitudinaldirectionsareobtainedInadditionbydeducingthesimplifiedfonnulaoftransmissionlinestowerwhichconsultedinterrelatedtheori

9、esandrescarchesapracticalandvisualizedsimplifiedmodelwithequivalentstiffnessiSobtainedDynamiccharacteristicsofequivalentstiffnesssimplifiedmodelisanalyzedbyintroducingtheoptimumequivalentstiffnesscoefficienta，∥alongtrans

10、verseandlongitudinaldirectionsAnalyticaldataindicatethatvibrationmodeoftheTLCTLareextraordinarycloseandmajorityiscable’SVibrationmodesInordertosimplyexactlyacquiringdynamiccharacteristicsofthetowercoupledcableeffects，the

11、time—historyresponsesofthetowerareacquiredbyinputtingWhite—noisewaveUsingfrequency—domainanalyses，thevibrationmodeoftowercoupledcableeffectscanbeidentifiedEnvironmentalvibrationtestwascarriedoutinengineeringsite，whichfur