Bayesian Analysis of the Phase II IASC–ASCE Structural

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1、BayesianAnalysisofthePhaseIIIASC–ASCEStructuralHealthMonitoringExperimentalBenchmarkData12J.Ching,A.M.ASCE,andJ.L.Beck,M.ASCEAbstract:Atwo-stepprobabilisticstructuralhealthmonitoringapproachisusedtoanalyzethePhaseIIexperimentalbenchmarkstudiessponsoredbytheIASC±ASCETaskGroup

2、onStructuralHealthMonitoring.Thisstudyinvolvesdamagedetectionandassessmentoftheteststructureusingexperimentaldatageneratedbyhammerimpactandambientvibrations.Thetwo-stepapproachinvolvesmodalidenti®cationfollowedbydamageassessmentusingthepre-andpost-damagemodalparametersbasedo

3、ntheBayesianupdatingmeth-odology.AnExpectation±Maximizationalgorithmisproposedto®ndthemostprobablevaluesoftheparameters.Itisshownthatthebracedamagecanbesuccessfullydetectedandassessedfromeitherthehammerorambientvibrationdata.Theconnectiondamageismuchmoredif®culttoreliablydet

4、ectandassessbecausetheidenti®edmodalparametersarelesssensitivetoconnectiondamage,allowingthemodelingerrorstohavemorein¯uenceontheresults.DOI:10.1061/(ASCE)0733-9399(2004)130:10(1233)CEDatabasesubjectheadings:Damageassessment;Bayesiananalysis;Identi®cation;Benchmarks;Structur

5、alanalysis;Modalanalysis.Introductionsimulatedandexperimentalbenchmarkproblems.Thebenchmarkstructureisafour-story,two-baybytwo-baysteel-framescale-Structuralhealthmonitoring(SHM)techniques(e.g.,NatkeandmodelstructurebuiltintheEarthquakeEngineeringResearchLaboratoryattheUniv.

6、ofBritishColumbia,Canada.AdiagramYao1988;HjelmstadandShin1997;Sanayeietal.1999;Vaniketfortheanalyticalmodelforthebenchmarkstructureisshowninal.2000;Becketal.2001;Chang2001;Bernal2002;CasciatiFig.1,givingdimensionsandcoordinatedirectionsinwhichthex2002)aremethodologiesthatuse

7、measuredresponsetodetectanddirectionisthestrongdirectionofthecolumns.TheJanuary2004locatedamageinstructuresandquantitativelyassessitsseverity.issueoftheJournalofEngineeringMechanicscontainstheresultsInrecentyears,civilengineershavepaidmuchattentiontoSHMofsixdifferentstudieso

8、fthePhaseIsimulatedbenchmarkprob-techniquessincetheyhavethepotentialtomonit