Analytical assessment of the effect of vertical earthquake motion on RC bridge piers

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1、AnalyticalAssessmentoftheEffectofVerticalEarthquakeMotiononRCBridgePiers123SungJigKim;CurtisJ.Holub;andAmrS.Elnashai,F.ASCEAbstract:ThispaperpresentsanalyticalassessmentoftheeffectofverticalearthquakegroundmotiononRCbridgepiers.AbridgestructuredamagedduringtheNorthridgeEarthqu

2、akeandaFederalHighwayconceptbridgedesignareexamined.Theeffectsofasuiteofearthquakegroundmotionrecordswithdifferentvertical-to-horizontalpeakaccelerationratiosonthetwobridgesarepresentedandtheresultsarecomparedwiththecaseofhorizontal-onlyexcitation.Theeffectsofarrivaltimeinterv

3、albetweenhorizontalandverticalaccelerationpeaksarealsoreportedandcomparedtothecaseofcoincidentmotion.Itisobservedthattheinclusionoftheverticalcomponentofgroundmotionhasanimportanteffectontheresponseatalllevelsandcomponents.Itisthereforeconcludedthatverticalmotionshouldbeinclud

4、edinanalysisforassessmentanddesign,especiallythattherearenoparticularchallengesimpedingitsinclusion.DOI:10.1061/
ASCEST.1943-541X.0000306CEDatabasesubjectheadings:Verticalloads;Groundmotion;Seismiceffects;Bridges,piers;Shearstrength;Bridges,concrete;Earthquakes;California.Aut

5、horkeywords:Verticalloads;Groundmotion;Seismiceffects;Bridges,piers;Shearstrength.Introductionaxialload,thereforeunderminingshearcapacity;anobservationwhichisconsistentwiththefailuremodeobservedintheÞeld.YuCivilengineeringstructuresaregenerallysubjectedtothree-
1996analyzedth

6、eeffectsoftheverticalcomponentofmotiondimensional
3Dearthquakeeffects.Horizontalearthquakeef-onpiers,foundations,hinges,andbearingsofthreeoverpassfectshavebeenstudiedextensivelyandconsideredinthedesignbridges.Thestudyreporteda20%increaseintheaxialforceprocesswhereasthevertica

7、lcomponentofearthquakeexcitationcomparedasapercentageofdeadloadanda7%increaseinthehasgenerallybeenneglectedorunderestimatedinanalysisandlongitudinalmomentimposedonthepierduetotheadditionofdesign.Previousinvestigations
e.g.,BroderickandElnashaitheverticalcomponent.Buttonetal.
2

8、002evaluatedthere-1995;PapazoglouandElnashai1996;amongothers