Analytical Fragility Curves for Multispan Continuous Steel Girder Bridges in Moderate Seismic Zones英文资料

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1、AnalyticalFragilityCurvesforMultispanContinuousSteelGirderBridgesinModerateSeismicZonesKarthikRamanathan,ReginaldDesRoches,andJamieEllenPadgettMultispancontinuoussteelgirderbridgesareoneofthemostcommon(3–7).Thecurrentfragilitycurvesusedforseismicriskasses

2、smentbridgetypesinthecentralandsoutheasternUnitedStates.Seismicfragilityofbridgesaretypicallybasedonsimplifiedanalysesorempiricalcurvesforthesehighwaybridgesareessentialforriskassessmentofhigh-datafromrecentearthquakes.Sinceearthquakedamagedataareverywaytr

3、ansportationnetworksexposedtoseismichazards.ThisstudyscarceinthecentralandsoutheasternUnitedStates(CSUS),usingfocusesondevelopingandcomparingfragilitycurvesforseismicallyandanalyticalmethodsistheonlyfeasibleapproachtoobtainfragilitynonseismicallydesignedb

4、ridgesthatarecommoninthisregion.Thepri-curves.marydifferencesbetweenseismicallyandnonseismicallydesignedbridgesIn1990,bridgesintheCSUSbeganincorporatingseismicdetails.arethecolumndetailsandbridgebearings.Detailedthree-dimensionalSomeofthechangesincludedth

5、ecomponentdesignforces,designof(3-D)nonlinearanalyticalmodels,whichaccountforthenonlinearbehav-columnsandfoundation,bearingtypes,andtreatmentofliquefactioniorofthecolumn,girders,andabutments,aredevelopedwiththeuseofandliquefaction-inducedgroundmovement(8)

6、.AdetailedreviewtheOpenSeesplatform.ThefragilitycurvesaredevelopedwithasuiteofofbridgesintheNationalBridgeInventory(9)builtafter1990inthegroundmotionsrepresentativeoftheseismichazardintheregion.UnlikeCSUSregionshowsthatmultispancontinuous(MSC)steelgirderm

7、ostpreviousstudies,thefragilitycurvesaredevelopedwithgeometricbridgesaccountforabout10%ofthebridgesintheregion.variationssuchascolumnheight,deckwidth,andlengthconsideredtoThepresentstudyfocusesondevelopingfragilitycurvesforseis-studytheeffectofthesevariat

8、ionsonthefragilitycurveswithinthesamemicallyandnonseismicallydesignedMSCsteelgirderbridgesinclassofbridges.TheresultsprovideinsightintothelevelofuncertaintyCSUS.Choietal.examinedover150bridgeplansfromthisregionintro