Estimating Basin Effects Using M9 and Recent Research for ...1 Estimating Basin Effects Using M9 and...
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EstimatingBasinEffectsUsingM9andRecentResearchforTallBuildingDesigninSeattle
COSMOSTechnicalSessionSusanChang,Ph.D.,P.E.INovember16,2018
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SeattleBasin
DatacourtesyofRichardBlakely
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TallBuildingsinSeattle(100+m,328+ft)
RainierSquareTower2020,850ft
F5Tower2017,660ft
ColumbiaCenter1984,933ft
RussellInvestmentsCenter2006,598ft
12013rd Avenue1988,772ft
SmithTower1914,462ft
FigurefromDougLindquist,HartCrowser
BackgroundSource:www.skyscrapercenter.com/city/seattle 31buildings31buildings
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March4,2013WorkshopChang,S.W.,Frankel.,A.D.,andWeaver,C.S.,2014,ReportonWorkshoptoIncorporateBasinResponseintheDesignofTallBuildingsinthePugetSoundRegion,Washington:U.S.GeologicalSurveyOpen-FileReport20-14-1196,28p.,https://pubs.usgs.gov/of/2014/1196/
• Basinamplificationfactorsfromcrustalgroundmotionmodels(amplificationfactorsafunctionofZ2.5 andZ1.0)• AppliedtoMCER fromPSHAforallEQsourcetypes
PhotobyDougLindquist,HartCrowser
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RecentResearchEffectofDeepBasinsonStructuralCollapseDuringLargeSubductionEarthquakesByMarafi,Eberhard,Berman,Wirth,andFrankel,EarthquakeSpectra,August2017
• BasinamplificationfactorsforsiteswithZ2.5 > 3km
Marafi etal.(2017)
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ObservedamplificationofspectralresponsevaluesforstiffsitesinSeattleBasinreferencedtoSewardParkstation–thinsoiloverfirmrockoutsideofbasin
2003underOlympics,M4.8
2001nearSatsop,M5.0
RecentResearch
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RecentResearchBroadbandSyntheticSeismogramsforMagnitude9EarthquakesontheCascadiaMegathrustBasedon3DSimulationsandStochasticSynthetics(Part1):MethodologyandOverallResultsByFrankel,Wirth,Marafi,Vidale,andStephenson,submittedtoBSSAJanuary2018,completedUSGSinternalreview
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USGS/SDCIMarch22,2018WorkshopAttendeesPeerreviewers• C.B.Crouse(AECOMSeattle)• SteveDickenson(NewAlbion)• IvanWong(Lettis Consultants)
GeotechnicalConsultants• DougLindquistandMichaelChamberlain(HartCrowser)• HamiltonPuangnakandMelanieWalling(GeoEngineers)• AliShahbazian andMattGibson(Shannon&Wilson)• RedaMikhailandFengLi(Golder)
GMMdevelopersandseismologists• NormAbrahamson(UCBerkeley)• KenCampbell(CoreLogic)• AndreasSkarlatoudis(AECOMLA)
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USGS/SDCIMarch22,2018WorkshopAttendeesUSGS/M9• ArtFrankel(USGS/M9)• ErinWirth(USGS/M9)• MarcEberhard(UW/M9)• SteveKramer(UW/M9)
SDCI• SusanChang• ScottPawling
OrganizationalRepresentatives• KevinAswegan(MKA,ASCE7SeismicCommittee)• AndyTaylor(KPFF,SEAWEEC)• DouglasBeck(CityofBellevue)
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Agenda• BasinfactorsfromGroundMotionModels
• HowbasintermsweredevelopedforcrustalGMMs• PresentationsbyCampbellandAbrahamson(Seyhancalledinforpartofworkshop)
• IncorporationofBasinResponseinSeattle• Whathavewebeendoingsincethe2013workshop?• PresentationsbyGeoEngineers andHartCrowser
• RecentResearch• EffectofDeepBasinsonStructuralCollapseDuringLargeSubductionEarthquakes,Marafi etal.,EQSpectra,August2017
• BroadbandSyntheticSeismogramsforM9EarthquakesontheCascadiaMegathrustbasedon3DSimulationsandStochasticSynthetics,Frankeletal.,submittedtoBSSAJanuary2018
• BasinAmplificationFactorsforCascadiaBasedonthe2011Tohoku,JapanEarthquake,Skarlatoudisetal.,11th NCEE,June2018(alsoUSGSFinalTechnicalReport,October2015)
• Site-specificMCERResponseSpectraforLosAngelesRegionbasedon3DNumericalSimulationsandtheNGAWest2Equations,Crouse,11th NCEE,June2018
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Agenda• CodeUpdatesandStructuralDesign
• ASCE7-16and7-22(C.B.Crouse)• Upcomingstructuralcodechanges(AndyTaylor)• Structuralimpacts(KevinAswegan)
• DiscussionandRecommendations
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DiscussionandRecommendations• Weshouldcontinuewiththegeneralprocedurefrom2013workshop:MCER spectrummultipliedbybasinamplificationfactor.• Basinamplificationfactorsdevelopedfromcrustalearthquakesarenotappropriateforsubductionzoneearthquakes(differentfrom2013workshop)
Copyright2015CoreLogic,Inc.Allrightsreserved.
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DiscussionandRecommendations
FiguresfromN.Marafi 2
Basin Amplification
Z2.5,REF = 1.0
Z2.5,REF = 3.0
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NewConsensusApproachforDevelopmentofBAFs• InterfaceSubductionHazard(basedonrecordedmotionsandM9project)• BAF=1atT=0sec• BAF=2atT> 2sec
• DeepIntraslab Hazard• Userecordedgroundmotionsfromlocalandregionalearthquakes(e.g.M6.8Nisqually,M6.4VancouverIsland)
• ShallowCrustalHazard• UsebasinfactorsfromCampbellandBozorgnia (2014)GMM
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ExampleSpectra• Increasefromoldtonewspectra
• T=1sec,10%
• T=2sec,24%
• T=5sec,15%
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ImplementationofMarchWorkshopResults
• Structuralcommunityconcernedaboutimmediateimplementation• TelephoneconferenceMay16withgeotechnicalandstructuralpeerreviewers,geotechnicalconsultantstodiscusspotentialdelayinimplementation• Scheduleofimplementation
• Director’sRule20-2018• December1,2018• Alldesignsusingsite-specificgroundmotionproceduresshallincorporatebasineffects
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Onthehorizon…• NGASubductionGMMs
• Willtheyincludebasinterms?• GeotechnicalandseismologicalcommunitywillneedtoevaluateapplicabilitytotheSeattleBasin
• HowdoweincorporateNGASubductionandM9results?• HadinitialdiscussionduringMarch2018workshop
• 2018NationalSeismicHazardMapupdatetoincludebasinfactorsfrom2013SDCI/USGSworkshop
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QUESTIONS?
SusanChang,Ph.D.,[email protected]
www.seattle.gov/sdci
DatacourtesyofRichardBlakely(USGS)