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张弦拱桁架结构基于模态参数的损伤识别试验（英文）.docx

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张弦拱桁架结构基于模态参数的损伤识别试验（英文） ExperimentalStudyonDamageIdentificationofZhangXianArchTrussStructuresBasedonModalParameters Abstract: Inthefieldofstructuralhealthmonitoring,damageidentificationisanimportanttopicasitimprovesstructuralsafetyandreliability.ThisstudypresentsanexperimentalinvestigationondamageidentificationofZhangXianarchtrussstructuresthroughtheanalysisofmodalparameters. TheexperimentaltestwasconductedonascalemodelofZhangXianarchtrussstructure,andthemodalparameterswereobtainedusingtheimpacthammertestandthevibrationresponsemeasurementsystem.Thedamagewassimulatedbyartificiallyintroducingtwodifferentdamagescenarios,namely,thedamageofmemberstiffnessandthedamageofmembermass,tothestructuralmodel. Themodalparametersoftheundamagedanddamagedstructureswereanalyzedandcomparedtoidentifythedamagelocationandextent.Theresultsshowthatthenaturalfrequenciesandmodeshapesofthestructurechangesignificantlywiththeintroductionofdamage,andtheextentofdamagecanbeestimatedbythechangesinmodalparameters. Furthermore,adamageindexbasedonthenormalizedmodeshapedifferencewasproposedtoquantifythedamageseverityofthestructure.Theeffectivenessandfeasibilityoftheproposeddamageidentificationmethodwereverifiedbytheresultsoftheexperimentaltest. TheexperimentalstudyprovidesapracticalmethodfordamagedetectionandassessmentofZhangXianarchtrussstructures,whichcancontributetothedevelopmentofstructuralhealthmonitoringandmaintenancetechniquesofsuchstructures. Keywords:damageidentification,ZhangXianarchtrussstructure,modalparameters,experimentalstudy,damageindex 1.Introduction ZhangXianarchtrussstructureisatypicalspatialtrussstructure,whichhasbeenwidelyappliedinlong-spanexhibitions,sportsvenuesandotherpublicbuildingsduetoitsadvantagesoflightweight,highrigidityandaestheticvalue.However,thedamageofstructuralmemberscausedbyvariousfactors,suchasfatigue,corrosion,overloadingandnaturaldisasters,mayleadtothereductionofstructuralperformanceandeventhefailureofthewholestructure.Therefore,thedevelopmentofefficientandaccura