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1、EngineeringFractureMechanics81(2012)26–32ContentslistsavailableatSciVerseScienceDirectEngineeringFractureMechanicsjournalhomepage:www.elsevier.com/locate/engfracmechFatiguecrackpropagationmonitoringbyAcousticEmissionsignalanalysisP.Antonaci,P.Bocca,D.Masera?Depar
2、tmentofStructuralandGeotechnicalEngineering,PolitecnicodiTorino,CorsoDucadegliAbruzzi24,10129Turin,ItalyarticleinfoabstractKeywords:Acrucialaspectindamageevaluationofmasonrystructuresistheanalysisoflong-termMasonrybehaviourandforthisreasonfatigueanalysishasagreat
3、in?uenceonsafetyassessmentFRPofthesestructures.FatigueAcousticEmission(AE)techniqueisveryeffectiveinidentifyingmicroandmacro-defectsCrackpropagationandtheirtemporalevolutionduetofatigueinseveralmaterials.ThistechniquepermitstoAcousticEmissionestimatethevelocityof
4、ultrasonicwavespropagationandtheamountofenergyreleasedSignalprocessingduringfracturepropagationtoobtaininformationonthecriticalityoftheongoingprocess.BymeansofAEmonitoring,anexperimentalanalysisontwodifferentsetsofreinforcedmasonrywallsunderfatigueloadinghasbeenc
5、arriedout.Duringthesetests,theAEsig-nalswererecorded.TheAEsignalswereanalysedusingFastFourierTransform(FFT)toexaminethefrequencydistributionduringthemicro-andmacro-crackingprocess.TheevolutionofthewavelengthoftheshearcomponentoftheAEsignalwasevaluatedthroughthetw
6、ocharacteristicpeaksintheAEsignalsspectrumandthewavespeedofthePorSwaves.Thiswavelengthevolutioncanprovideinformationonthemicro-crackandmacro-crackprogress.Thisprocedurepermitstoestimatethecharacteristicfracturedimensioninseveralloadingconditionsandfordifferentmas
7、onryreinforcingmethods.ó2011ElsevierLtd.Allrightsreserved.1.IntroductionFromatechnologicalpointofview,sofar,thestrengtheningofmasonrystructureshasbeenaccomplishedadoptingstan-dardmaterials,mainlyreinforcedconcreteandcement-basedorcement-freemortars,sometimesinduc
8、ingachangeinthestaticbehaviourofthestructures.Amongtheseinterventions,oneofthemostcommonistoprovidesingle-ordouble-sidedstructuralmortarlayers.Thistechniqueisc
