簡支梁、連續(xù)梁損傷識別與可靠性再評定.pdf

1、湖南大學(xué)博士后士學(xué)位論文簡支梁、連續(xù)梁損傷識別與可靠性再評定姓名：姜海波申請學(xué)位級別：博士后士專業(yè)：結(jié)構(gòu)工程指導(dǎo)教師：易偉建1999.11.1DamageIdentificationandReliabilityUpdatingofSimpleSupportBeamandContinuousBeamAbstractInthereport，themodalchangebetweendamagedandnon—damagedsimplesup

2、portbeamwithboundaryconditionisinvestigatedthoroughlyandsystematicallyBasedontheanalysisofdifferentalgorithmsforparameteridentification，thelocationsandmagnitudesofdamagesareidentifiedaccordingtomodalchangeUsingamasslessr

3、otationalspringtOrepresentthecrack—induceddamage，consideringtheboundaryconditionandcontinuouscondition，thevibrationequationandeign—equationofdamagedandnondamagedbeamwithdifferentboundaryconditionsarefounded，whichiSbasisf

4、oridentifyingdamageandfindingouteignmodeTakingadvantageOfHilmtonTheory，usingmasslessrotationalspringandstillreductiontepresentthecrackinduceddamagerespectively，thebeam’smodeswithdifferentboundaryconditionsareturnedoutAFE

5、MprogrammeformodesolutioniswrittenbyauthorMakingUSeoftherelationshipbetweenmodelchangeanddamages，thedamageofstandardsimplesupportbeamisidentifiedbymeansofpseudo—inversemethodAddingconstrainstOthebeamwithboundarycondition

6、，thebeamisreversedtostandardsimplesupportbeam，SOthatthedamageofthebeamwithboundaryconditioncanalsobeidentifiedbypseudo—inversemethodUtilizingtheexpansionofflexibilitymatrixofbeamandcontinuousbeam，thestillreductionmatrixo

7、fthebeamcanbesolvedaccordingtomodalchange，therefore，thelocationsandmagnitudesofdamagescanbeinferredfromstillreductionThefeasibilityandpracticalityofthosemethodsareillustratedbysomeexamplesAnewdamageidentificationmethodis

8、preposedforcontinuousbeaminthisreport，andthevibrationreversemethodforsimplesupportbeamisalsosuitableforcontinuousbeamTherelationshipbetweendamageandreliabilityupdatingofbridgestructureisanalysizedthroughoutly，theconditio