基于高频低振幅共振破碎技术的路面结构力学行为研究的中期报告

基于高频低振幅共振破碎技术的路面结构力学行为研究的中期报告AbstractThismid-termreportpresentstheprogressmadeinresearchonthemechanicalbehaviorofpavementstructuresusinghigh-frequencylow-amplituderesonancebreakingtechnology.Thereportfocusesonthefollowingaspects:theoreticalanalysisofresonancebreakingtechnology,experimentalsetup,andpreliminaryexperimentalresults.Basedontheanalysisandexperimentsconducted,thestudyshowspromisingresultsthatcanbeexploredfurthertoimprovetheknowledgeofthemechanicalbehaviorofpavementstructuresandprovideinsightsforpavementdesignandmaintenance.IntroductionPavementstructuresareanessentialcomponentoftransportationinfrastructurethatrequiresfrequentmaintenanceandrehabilitationduetotheeffectsoftrafficloadandenvironmentalfactors.Inadequatedesignandmaterialselectioncanleadtorapiddeteriorationofthestructure,potentiallycausingsafetyhazardstovehiculartraffic.Maintenanceandrehabilitationofthesestructuresareessentialforthesafetyofroadusers.However,themethodsusedforevaluatingthepavementstructurehealthhavelimitationsintermsofaccuracyandaccessibility.Recently,theuseofhigh-frequency,low-amplituderesonantfrequencytechnologyhasincreasedinthefieldofpavementevaluation.Thistechnologyinvolvesinducingresonanceinthepavementstructureathighfrequencieswhilemeasuringtheamplitudeofvibration.Themeasuredamplitudecanthenbeusedtoassesstheconditionandmechanicalpropertiesoftheroadstructure.Thisreportpresentstheprogressmadeinresearchaimedatexploringthemechanicalbehaviorofpavementstructuresusinghigh-frequency,low-amplituderesonancebreakingtechnology.Thereportdiscussesthetheoreticalanalysisofresonancebreakingtechnology,experimentalsetup,andpreliminaryexperimentalresults.TheoreticalAnalysisThehigh-frequency,low-amplituderesonancebreakingtechnologyinvolvesapplyingasinusoidalinputforce,whichresultsinthepavementstructure'sdisplacementinresonancewiththeappliedfrequency.Whentheinputforcereachesthepavementstructure'snaturalfrequency,thestructure'samplitudeofvibrationincreasessignificantly.Contrarily,whentheappliedfrequencydeviatesfromthenaturalfrequency,thestructure'svibrationamplitudeislow.Theresonantfrequencyofthepavementstructureisinfluencedbymanyfactorssuchasthickness,stiffness,andmodeshape.Thesefactorsareusedtodeterminethevibrationfrequency,andresonancebreakingtechnologycanbeusedtoevaluatethestructuralhealth.Resonancebreakingtechnologycanbeusedtoevaluatetheflexiblepavement'smechanicalbehavior,especiallythedynamicmodulusofelasticity(E*)andthePoisson'sratio(ν).Thedynamicmodulusofelasticityisameasureofthepavementstructure'sstiffnesswhilePoisson'sratioisameasureofthepavementstructure'sstrength.ExperimentalSetupTheexperimentalsetupusedforthisstudyinvolvesahammerforapplyingforce,displacementsensorsformeasuringdisplacement,anddataacquisitionsystemsforcollectingdata.Thehammerexcitesthepavementstructurewithasinusoidalinputforce,andthedisplacementsensorsmeasurethepavementstructure'svibrationamplitude.Theacquireddataisthenprocessedthroughsoftwaretoevaluatethepavementstructure'smechanicalbehavior.PreliminaryExperimentalResultsThepreliminaryexperimentalresultsshowthattheresonancebreakingtechnologycanbeusedinassessingthepavementstructure'smechanicalbehavior.Thetechnologyprovidedvaluabledataforevaluatingthepavementstructure'sdynamicmodulusofelasticity(E*)andPoisson'sratio(ν).Additionally,thestudyshowedthatthepavementstiffnessdecreasedwithincreasedtemperature,makingthepavementmoresusceptibletodeformationandrutting.ConclusionsThehigh-frequency,low-amplituderesonancebreakingtechnologyisapromisingmethodforevaluatingthemechanicalbehaviorofpavementstructures.Itprovidesvaluabledataforevaluatingthepavementstructure'sdynamicmodulusofelasticity(E*)andPoisson'sratio(ν),makingitanessentialtoolforpavementdesignandmaintenance.Theresearchstudydiscussesthetheoreticalanalys