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1、JSCEJournalofEarthquakeEngineeringSEISMICRISKDENSITYCURVESFORGRAVITY-TYPEQUAYWALLSKojiICHII11SeniorResearcher,PortandAirportResearchInstituteNagase3-1-1,Yokosuka,Kanagawa239-0826,Japan,ichii@pari.go.jpInordertodiscussthedeterminationofthedesigngroundmotionlevelinseismicdesignforgravitytypequaywalls,
2、characteristicsofseismicriskdensitycurvesareanalyzed.First,seismiclossfunctionsformanysituationsareproposedbasedonfragilitycurves,whichwerecalibratedbytheresultsofeffec-tivestress-basedFEManalysisconsideringmanyparametersincludingliquefactionresistanceoffounda-tion.Then,seismicriskdensitycurvesforth
3、esesituationsarecalculatedusingproposedseismiclossfunctionwiththeresultsofseismichazardanalysisatKobePortandSakaiPort.Theseseismicriskden-sitycurvescanbeclassifiedintothreetypes.Finally,aconceptofdesigngroundmotionleveldefinitionwasdiscussedbasedontheevaluatedseismicriskdensitycurves.Keywords:seismi
4、cdesign,groundmotionlevel,seismicriskdensitycurve,gravity-typequaywall2)1.INTRODUCTIONapproachcanworkwell.However,thebackgroundisnotverifiedforthegeneralcase.Inanewpro-SinceshortlyaftertheKobedisasterin1995,theposalofseismicdesignguidelinesforportstructurestwo-levelapproachhasbeencommonlyusedintheby
5、theInternationalNavigationCongress(PIANC),definitionofthedesigngroundmotionlevelinJa-level-1andlevel-2earthquakemotionsaredefinedpan.Forexample,theconceptofperformance-basedasthemotionswitha50%and10%chanceofbe-designhasbeenintroducedinthenewtechnicalingexceededduringthelifespanofastructurestandardfo
6、rportfacilities,whichwasrevisedin(probabilityofexceedanceof50%and10%),re-3)1999,anditstatedthathighseismicresistantfacili-spectively.Inthiscase,thesecondquestioncanbetiesshouldmaintaintherequiredperformanceanswered.However,similarquestionssuchas‘whyagainstthelevel-2earthquakemotionswhosereturn50%and
7、10%?’stillremain.1)Theauthorbelievesthedesigngroundmotionperiodsareoversomehundredyears.However,thereisnosupportingexplanationofthebasisforlevelshouldbedeterminedwiththeconsiderationofdefiningthedesig
