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1、DynamicresponseofgravitydammodelwithcrackdamagedetectionWANGShanShan&RENQingWenCollegeofMechanicsMaterialsHohaiUniversityNanjing210098ChinaGravitydamisatypicalstructurethathasbeenfrequentlyusedinthefieldsofwaterconservan

2、cyengineeringthesafetyofthestructurehasreceivedwidespreadattentionrecently.Duetoearthquakesotherreasonsgravitydamsnmallyhavedamagesuchascracksinpracticalservice.Damageinthestructurescanalterthestructuraldynamicbehaviseri

3、ouslyaffectstructuralperfmance.Maintainingsafetyintegrityofthegravitydamstructuresrequiresabetterunderstingofdynamicresponseofstructurewithdamageassociateddamagedetectionmethod.Indertostudythoughlythedynamicbehaviofgravi

4、tydamwithdamagethesweepvibrationresponsesofthegravitydamwithwithoutdamageareinvestigated.Theexperimentalresultsshowthatthepeakpeakaccelerationresponsesallincreasefthestructureiswithcrack.Atthesametimeastructuraldamagedet

5、ectionmethodi.e.thelocaldamagefact(LDF)methodisconsideredinthestudyofgravitydamdamagedetectionwhenthedamissubjectedtothebaseexcitation.ItisshownthattheLDFmethodcanbeusedasadamageindexiscapableofevaluatingboththepresencer

6、elativeseverityofstructuraldamageitcanbeusedasaviableconditionassessmentdamageonthestochasticdynamicresponseofdamreservoirfoundationsystemsubjectedtodifferentearthquakeinputmechanisms.Calayiretal.investigatedtheearthquak

7、edamageresponseoftheconcretegravitydams.Zhuetal.studiedtheseismicbehaviofconcretegravitydamswithcracksthatperatedthemonoliths.Arabshahietal.studiedvariouspossibilitiesofnaturalisolationoccurringalongthedamfoundationinter

8、faceduringanearthquakeindertoevaluatetheseismicresponseofanexistinggravitydam.Longetal.conductedcomparativestudiestoinvestigatetheseismicresponseofa160mhighgravitydamwithwithoutreinfcement.Becausemanygravitydamsarebeingc

9、onstructedinthehighseismicriskzonestheearthquakeisachallengetothesedams.Therefeinthesepreviouswksmostofthestudiesconcentratedonthesafetyofdamsubjectedtoearthquakeproviderelativelylittleinfmationonvibrationresponseofstruc

10、turewithcrack.Fewwksfocusedonvariationofstructuraldynamicbehavibroughtbystructuraldamage.Manygravitydamstructuresexposedtovariousexternalloadsduringtheirlifetimehavesuffereddamagedeteriationsuchascrack.Vanluitetal.pointe

11、doutthatdamageinthestructuresaltersthestructuraldynamicpropertiesresponsesuchasstiffnessmassdampingnaturalfrequencymodeshapevibrationsignalresponseetc.Damagecanseriouslyaffectstructuralperfmancemayeventuallyleadtocatastr

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