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ID:36620397
大小:1.74 MB
页数:72页
时间:2019-05-13
《基于动力特性变化的桥梁损伤定位方法》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、西南交通大学硕士学位论文基于动力特性变化的桥梁损伤定位方法姓名:游翔申请学位级别:硕士专业:桥梁与隧道工程指导教师:蒲黔辉20060501西南交通大学硕士研究生学位论文第1I页Abstractnamcisasocialeconomjcblood,andabridgejsatrafficthfoat.ThedevelOpmentofsociale∞nomywillbelimitedifttletmfficdoesn’tmoVetoand仃om,s0i“sveryiInpon柚ttomal(esureeverybridge’sfIInctionandsafcty
2、.T0useeveryb删geno瑚ally蠲dem蛐dstotestormonitortobridgcs’safctyfromnOwaIIdthen.AtpfesentthefearealaFgequaIltityofbfidgesinourcountfy-OnehaⅡd,manyOld喇dgeshaveapproachedtheirdesi印ljfctime,theircomponentshaveagedandbed锄aged.Ontheot重lerh柚d,anumbernewandla唱e—scalebridgeswillbebuilt.Toassur
3、ethesebridges’safcty柚davOidaccid∞ts,weshouldgetonmonitOron·linetonewbridges,anddetectdamageandideⅡtifyreliaIbilitytoOldbridges.F0rla唱e—scalest川ctIlres,itisverydifficIllttosimlllt孤eouslyidentifythelocationaIldex毫entofelement-1evddamagcbyusjngoftheljlnitedmodalmeasurements,whichoften
4、leadstowmngresultSofdamageidentification.Themethodology,wllichis咖poSedbythe甜obalidcntification孤dlocaljdentification,is锄e雎ctiveappmacht0idcntifythestnlcturaldanlageincomplexstnlctufes.A州ithcntheIocaldamageidentif:icationofbeam—likestmcturesisstudiedwjthmodalmeasufcmentsbasedonlOcalv
5、jbratjon.Themaillcon£entsOfthedissenationarelistedasfoUows.Firstly,InthisPaper,afterabriefoverviewofthedeVelopmentofbridgehealthmonitorillg,theconnotationofbridgehealthmonitoringisPoiIltedoutinanextendedsense.Andthen,Actualityofdamageidentifjcationfbrstrllcturesisexpatiatedandcomme
6、ntsaremadeonthemethodsofthem.Thesemethodsindudenaturalfrequency,strainmodalshape,CoMAC,nexibilitymatrix,waVeletanalysis,geneticalgorithmsetc.Finally,throughsomeofnumericalsimulationtoacoⅡtinuousbeambridge,localdamagelDcaljzationbasedondynamicsignaluI℃sjsPresented.Theappljcabilityof
7、threedynamicsignaturesbasedfrequencydataarestudied,andthenumericalsimulationsofdififercntdamagecasesarecarriedout.Theresults西南交通大学硕士研究生学位论文第1II页demonstratethattlIeno舯alizedchangemti0of丘equencyisstableaschan百ngthed锄agelocation柚dextent.Therefbre,thenormaIizedchaIlgeratiooffrequencyis
8、selectedasdynaIIlicsignatI
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