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1、SEISMICDESIGNPROVISIONS-THECANADIANHIGHWAYBRIDGEDESIGNCODEDenisMITCHELLMcGillUniversity817SherbrookeSt.W.Montreal,Quebec,CanadaH3A2K6MichelBRUNEAUUniversityofOttawa161LouisPasteurOttawa,Ontario,CanadaK1N6N5IanBUCKLEUniversityofAucklandPrivateBag92019Auckland,NewZealandDinoBA
2、GNARIOLMinistryofTransportation301St.PaulSt.St.Catharines,Ontario,CanadaL2R7R4SteveZHUBucklandandTaylorLtd.1591BowserAve.NorthVancouver,BritishColumbia,CanadaV7P2Y4NormanMcCAMMONGolderAssociates500-4260StillCreekDriveBurnaby,BritishColumbia,CanadaV5C6C6SummaryThispaperdescri
3、besthenewseismicdesignprovisionsoftheCanadianHighwayBridgeDesignCode,dueforpublicationby1999.Inparticulartheprovisionswhichdifferfromthoseinthe1994AmericanAssociationofStateHighwayandTransportationOfficialsLoadandResistanceFactorCodearehighlighted.DevelopmentsinShortandMediu
4、mSpanBridgeEngineering’98Page2INTRODUCTIONThispaperdescribesthenewseismicdesignprovisionsgiveninSection4oftheCanadianHighwayBridgeDesignCode(CHBDC)[1],dueforpublicationby1999.Inparticulartheprovisionswhichdifferfromthoseinthe1994AmericanAssociationofStateHighwayandTransporta
5、tionOfficialsLoadandResistanceFactorCode(AASHTOLRFD)[2]arediscussed.Theseismiczoningmapsforthe1994AASHTOLRFDCodeweredevelopedbasedon"firm-ground"horizontalaccelerationshavingaprobabilityofexceedanceof10%in50years.Thisisthesamebasisfortheseismiczoningmapsthatappearinthe1995Na
6、tionalBuildingCodeofCanada[3].HowevertheNBCCusestwoparametersforeachlocation,thatistheaccelerationandthevelocity,eachhavingaprobabilityofexceedanceof10%in50years.WhiletheSeismicSubcommitteeoftheCHBDCpreferredthetwo-parameterapproach,usingbothaccelerationandvelocity,itwasfelt
7、thattherewerenewdesignapproachesonthehorizonforNorthAmericancodes.InparticulartheUniformHazardSpectrum(UHS)approachwasbeingconsideredbytheCanadianNationalCommitteeonEarthquakeEngineeringforpossibleinclusioninthenexteditionoftheNBCC.TheUHSapproachofferstheadvantageofproviding
8、spectralvaluescorrespondingtotwodistinctperiodsforeachlocationinthecountry.
