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非均匀碰撞对曲线梁桥地震反应的影响分析的中期报告.docx

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非均匀碰撞对曲线梁桥地震反应的影响分析的中期报告 Introduction: Thisreportpresentsthemid-termfindingsoftheimpactofnon-uniformcollisionontheseismicresponseofcurvedbeambridges.Thestudyaimstoinvestigatetheeffectofnon-uniformcollisiononthestructuralresponseofcurvedbridgesunderthreedifferentearthquakeexcitationinputs.Inthisreport,themodelingandanalyticalapproach,alongwiththesimulationresultsobtainedsofar,areexplained. Methodology: Inthisstudy,acurvedbeambridgemodelwithaspanof60mandacurvatureof1/300isconsidered.Firstly,afiniteelementmodeliscreatedusingANSYSsoftware,whichconsistsofbeamandshellelements.Afterward,anon-uniformcollisionissimulatedatthemid-spanofthebridgebyapplyingaconcentratedloadtospecificnodesofthestructure.Themagnitudeandlocationoftheloadarevariedtoanalyzetheeffectsofnon-uniformcollisionontheseismicresponseofthebridge. Tosimulatetheseismicload,threegroundmotionsareused,whicharescaledtodesign-levelearthquakesinthePacificNorthwestregionoftheUS.ThegroundmotionsincludeNorthridge,ElCentro,andKoberecords.Theanalysesarecarriedoutusingatimehistoryapproach,whichinvolvestheuseofdirectintegrationtechniques. Results: Thesimulationresultsobtainedsofarindicatethatnon-uniformcollisioncansignificantlyaffecttheseismicresponseofthecurvedbeambridge.Itisobservedthatthedamagetothestructureismoreseverewhenthecollisionisappliedatthemid-span.Moreover,theincreaseintheloadmagnitudeoritseccentricityfromthecenterlineofthebridgefurtherexacerbatesthedamage. Regardingtheseismicloads,itisobservedthattheKobegroundmotionhasthemostsignificanteffectonthestructuralresponsecomparedtoNorthridgeandElCentro.Thisisduetothehigh-frequencycomponentsoftheKoberecord,whichmatchthenaturalfrequencyofthebridge. Conclusion: Themid-termfindingsindicatethatnon-uniformcollisionhasasignificantimpactontheseismicresponseofcurvedbridgestructures.Thedamagetothestructureismoreseverewhenaloadisappliedatthemid-span,andtheincreaseinloadmagnitudeoreccentricityworsensthecondition.Thestudywillcontinuewiththeanalysisoftheremaininggroundmotionstogai