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Development of Corresponding Building Code “Design” Maps. USGS Workshop on Seismic Hazards of Guam/Northern Mariana Islands & American Samoa. Nicolas Luco Research Structural Engineer. USGS – Golden , CO. Hazard Map (2%-in-50yrs P.E.). Risk-Targeted Map (1%-in-50yrs P.C.).
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Development of Corresponding Building Code “Design” Maps USGS Workshop on Seismic Hazards of Guam/Northern Mariana Islands & American Samoa Nicolas Luco Research Structural Engineer USGS – Golden, CO
Hazard Map (2%-in-50yrs P.E.) Risk-Targeted Map (1%-in-50yrs P.C.) MCER Map (’12 IBC) MCE Map (≤‘09 IBC) Deterministic Map Deterministic Map (min) (min) Risk Coefficient Map Hazard Curves + scaling to max direction
HAZARD Maps DESIGN Maps • e.g., 2014 Update of USGS Hazard Maps 2014 2016 2018 NEHRP Prov’s ASCE 7 Standard Intl Bldg Code
Design Maps Development Schedule • Jan 3, ’12: Placeholder 2015 IBC change proposal submitted • Jan 11, ‘12: Presented placeholder design maps to BSSC PUC USGS Workshop on Seismic Hazards of Guam/Northern Mariana Islands & American Samoa “Development of Corresponding Building Code ‘Design’ Maps,” N. Luco, USGS July 6, 2012
9) Design Maps for Guam 300% g Under Review SS 315% g SS ASCE 7-10 2014 NEHRP? Under Review 75% g S1 S1 Building Seismic Safety Council (BSSC) Provisions Update Committee (PUC) Meeting “Briefing on PUC Design Mapping Task Group,” N. Luco, USGS January 11, 2012
9) Design Maps for American Samoa 50% g Under Review 75% g SS SS ASCE 7-10 2014 NEHRP? Under Review 20% g S1 S1 Building Seismic Safety Council (BSSC) Provisions Update Committee (PUC) Meeting “Briefing on PUC Design Mapping Task Group,” N. Luco, USGS January 11, 2012
Design Maps Development Schedule • Jan 3, ’12: Placeholder 2015 IBC change proposal submitted • Jan 11, ‘12: Presented placeholder design maps to BSSC PUC • Jan-Apr, ‘12: USGS hazard models completed (& published) • May 5, ‘12: Requested disapproval of placeholder IBC proposal • May 9, ‘12: Presented finalization plans to BSSC PUC … USGS Workshop on Seismic Hazards of Guam/Northern Mariana Islands & American Samoa “Development of Corresponding Building Code ‘Design’ Maps,” N. Luco, USGS July 6, 2012
Design Maps Development Schedule • July, ‘12: Public workshop to finalize consensus hazard models • July-Aug, ‘12: Ballot final design maps through BSSC PUC • July 31, ‘12: Submit final design maps to IBC as public comment • Aug-Sep, ‘12: Public forums in Guam & American Samoa • Oct 9-10, ‘12: Resolve BSSC PUC vote/comments • Oct 22-28, ‘12: Final Action Hearings for 2015 IBC • Nov, ‘12: DOD Unified Facilities Criteria update finalized USGS Workshop on Seismic Hazards of Guam/Northern Mariana Islands & American Samoa “Development of Corresponding Building Code ‘Design’ Maps,” N. Luco, USGS July 6, 2012
Questions for Today • Do the (published) USGS hazard models for Guam & American Samoa need to be revised? • If so, in what way? • If not, what are the explanations for the differences w.r.t. previous estimates (e.g. the 1997 NEHRP Provisions)? USGS Workshop on Seismic Hazards of Guam/Northern Mariana Islands & American Samoa “Development of Corresponding Building Code ‘Design’ Maps,” N. Luco, USGS July 6, 2012
9) Design Maps for Guam 285% g SS SS 275% g ASCE 7-10 2014 NEHRP? 70% g S1 S1 Building Seismic Safety Council (BSSC) Provisions Update Committee (PUC) Meeting “Briefing on PUC Design Mapping Task Group,” N. Luco, USGS May 9, 2012
9) Design Maps for American Samoa 30% g 40% g SS SS ASCE 7-10 2014 NEHRP? 15% g S1 S1 Building Seismic Safety Council (BSSC) Provisions Update Committee (PUC) Meeting “Briefing on PUC Design Mapping Task Group,” N. Luco, USGS May 9, 2012