Revised Report Of Probabilistic Seismic Hazard Analysis Main Athens .

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Ms. Gwynne M. Darden, AIAOffice of University Architects for Facilities PlanningThe University of Georgia382 East Broad StreetAthens, Georgia 30602January 15, 2020Revised Report of Probabilistic Seismic Hazard AnalysisMain Athens CampusThe University of GeorgiaAthens-Clarke County, GeorgiaGeo-Hydro Project Number 191043.20Dear Ms. Darden:Geo-Hydro Engineers, Inc. has completed the authorized probabilistic seismic hazard analysis (PSHA) forthe main campus of The University of Georgia in Athens-Clarke County. The scope of services for PSHAwas outlined in our proposal number 23553.20 dated July 16, 2019. The main purpose of this analysis isto provide seismic hazard parameters that the University can provide to structural engineers for projectsthat will be designed under the International Building Code (IBC), 2018 Edition. Please note that it ispossible that future amendments to the 2018 IBC may require reevaluation of the parameters we presentbelow. In our opinion, this analysis is valid for sites in the area outlined in red on the UGA Area I - MainCampus, UGA Area II – South Milledge Precinct, and UGA Area 3 – Health Science Campus Maps attachedto this report.Site-Specific Probabilistic Seismic Hazard Analysis (PSHA)The following table presents seismic design values interpolated from applicable seismic hazard maps fromthe building code as well as values determined by the probabilistic seismic hazard analysis performed forthis report.Parameter2018 IBCProbabilistic HazardAnalysisSs (g)S1 (g)0.2060.0860.1980.076The methodology for the PSHA is outlined in the following sections.Seismic Hazard Analysis MethodologyInternational Building Code 2018The International Code Council (ICC) is a collaboration of the three major model code groups in the UnitedStates. The ICC formed specifically for the purpose of developing a model code to be used throughout thecountry. The first edition of the International Building Code (IBC) was published in March, 2000. The190 Ben Burton Road, Suite C Bogart, Georgia 30622706.354.1800 Fax: 706.354.6867

UGA Central Campus Probabilistic Seismic Hazard Analysis Athens-Clarke County, GeorgiaProject Number 191043.00seismic provisions of IBC 2018 incorporate ASCE 7-16, which is based on the 2015 NEHRP RecommendedProvisions.The spectral response acceleration for the maximum considered earthquake ground motion is determinedfor short periods (SS, typically calculated at 0.2 seconds) and at 1 second, (S1). SS and S1 are interpolatedfrom contour maps, or are calculated by a site-specific hazard analysis. The SS and S1 values are based ona risk-targeted maximum considered earthquake (MCER) having a 1 percent in 50 years collapse risk target.Development of Seismic Hazard MapsContour maps of SS and S1 used in the IBC 2018 and the NEHRP Recommended Provisions were developedwith the goal of having the probability of exceeding the design ground motion be roughly the same for allparts of the country. These maps are consensus documents conceived with the notion that “judgment,engineering experience, and political wisdom are as necessary as science” (1994 NEHRP Commentary,Page 277).The contour maps of SS and S1 for the NEHRP Recommended Provisions were developed by the BuildingSeismic Safety Council (BSSC) based on National Seismic Hazard Maps developed by the U.S. GeologicalSurvey (USGS). The USGS maps are intended to define the probabilistically calculated maximumconsidered earthquake ground motion based on a methodology developed by Frankel (1996). Thismethodology includes different models of seismic hazard combined with large background zones used toquantify hazard in areas with little or no historic seismic activity. The source catalog used for this mappingeffort consisted of “merged catalogs from several different sources, and fairly subjective criteria.”Similar to the mapping effort for the 1994 Recommended Provisions, modifications to the USGS maps weremade using the engineering judgment of the Seismic Design Procedure Group (SDPG), a committeeappointed by BSSC to produce the 2015 NEHRP maps of SS and S1.Site Specific Hazard Analysis and JustificationWe performed a probabilistic seismic hazard analysis generally following a methodology described byKramer (1996). This methodology first involves identification and characterization of earthquake sourcesand their recurrence characteristics. Additionally, we incorporated information included in the Central andEastern United States Seismic Source Characterization for Nuclear Facilities (2012), which was developedby the U.S. Nuclear Regulatory Commission, the U.S. Department of Energy, and the Electric PowerResearch Institute including research and data from April 2008 to December 2011.ASCE 7-16 requires the hazard analysis to account for regional tectonic setting, geology, and seismicity,the expected recurrence rates and maximum magnitude of earthquakes on known faults and source zones.This analysis complied with these provisions by using the USGS 2014 National Seismic Hazard Mapseismic model as implemented for the EZ-FRISK seismic hazard analysis software from Fugro Consultants,Inc. For this analysis, we used a catalog of seismic sources similar to the one used to produce the 2014National Seismic Hazard Maps developed by the U.S. Geological Survey (USGS).ASCE 7-16 further requires that the analysis use appropriate regional characteristics of ground motionattenuation, near source effect, and the effect of subsurface site conditions on ground motions. Attenuationequations are predictive relationships used to determine the probability of a particular ground motion at theJanuary 15, 2020 2

UGA Central Campus Probabilistic Seismic Hazard Analysis Athens-Clarke County, GeorgiaProject Number 191043.00site due to a particular earthquake some distance from the site. The ground motions predicted by theattenuation equation for each seismic source are then combined to predict the probable ground motion atthe site for a given recurrence period. For this probabilistic hazard analysis, we considered attenuationequations developed by Toro et al. (1997); Campbell (2003); Silva (2002); Tavakoli-Pezeshk (2005); andAtkinson and Boore (2006).ReferencesAtkinson, G. M. and D. M. Boore (2006). Earthquake ground-motion prediction equations for eastern NorthAmerica, Bull. Seism. Soc. Am. 96, 2181--2205.Building Seismic Safety Council (2015), “NEHRP Recommended Seismic Provision,” Federal EmergencyManagement Agency of the U.S. Department of Homeland Security, FEMA P-1050-1Campbell, K.W. (2003). “Prediction of Strong Ground Motion Using the Hybrid Empirical Method and ItsUse in the Development of Ground-Motion (Attenuation) Relations in Eastern North America.” BulletinSeismological Society of America, Vol. 93, No. 3, pp. 1012-1033, June.Frankel, A. (1996), “Nation Seismic Hazard Maps: Documentation,” US Geological Survey, OFR 96-352.Silva, W.J. et al. “Development of Regional Hard Rock Attenuation Relations for Central and Eastern NorthAmerica,” website, January 16, 2002. pp. 1-24.Stirewalt, G. et. al. (2012), “Central and Eastern United States Seismic Source Characterization for NuclearFacilities,” U.S. Nuclear Regulatory Commission, NUREG-2115Behrooz Tavakoli and Shahram Pezeshk "Empirical-Stochastic Ground-Motion Prediction for EasternNorth America", Bulletin of the Seismological Society of America; December 2005; v. 95; no. 6; p. 22832296Toro, G.R. (1999) Modification of the Toro et Al. (1997) “Attenuation Equations for Large Magnitudesand Short Distances,” Risk Engineering, Inc., website, pp. 4-1 to 4-10.*******January 15, 2020 3

UGA Central Campus Probabilistic Seismic Hazard Analysis Athens-Clarke County, GeorgiaProject Number 191043.00We appreciate the opportunity to serve as your geotechnical consultant for this project, and are prepared toprovide any additional services you may require. If you have any questions concerning this report or anyof our services, please call us.Sincerely,GEO-HYDRO ENGINEERS, INC.Mason F. Berryman, P.E.Principal EngineerLuis E. Babler, P.E.Chief Engineermason@geohydro.comluis@geohydro.comMichael P. Riddle, P.G.Principal / Athens Managermike@geohydro.comMFB/LEB/191043.20 UGA Central Campus Probabilistic Seismic Hazard Analysis 1-15-20.docxJanuary 15, 2020 4

UNIVERSITY of GEORGIA CAMPUS MAPUGA Area 1 - Main CampusUniversityArchitectsG.I.S.July 2014


3 Health Science CampusIPRENCEAVOGLETHORPE AVENovember 2019

This analysis complied with these provisions by using the USGS 2014 National Seismic Hazard Map seismic model as implemented for the EZ-FRISK seismic hazard analysis software from Fugro Consultants, Inc. For this analysis, we used a catalog of seismic sources similar to the one used to produce the 2014 National Seismic Hazard Maps developed by .

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