PEER “Sponsored” Research Projects Yousef Bozorgnia, Ph. D. , P. E. PEER Associate Director October 9, 2007
Sponsored Research Projects Those partially or fully funded by outside the PEER “core” (i. e. , PEER NSF or State matching funds) Funding from: n NSF n Caltrans n California Energy Commission (CEC) n PG&E n Bonneville Power Administration (BPA) n FEMA n BART n California Earthquake Authority (CEA) n Pankow Foundation PEER 2007 IB Meeting Funding from: n California Strong Motion Instrumentation Program (CSMIP) n California Earthquake Authority (CEA) n US Department of Energy (DOE) n US Nuclear Regulatory Commission (NRC) n City & County of SF n City of LA
Examples of Sponsored Programs/Projects Tall Buildings Initiative Grand Challenge: Mitigation of Seismic Risk in Nonductile Concrete Buildings PEER Lifelines Program Next Generation Attenuation (NGA) Models for: n n Western US (NGA-West) Central & Eastern US (NGA-East) PEER 2007 IB Meeting
Tall Buildings Initiative A major construction boom for tall buildings There are 95 tall buildings in LA, waiting to get construction permits (up to 76 stories) San Francisco, Seattle Sacramento, Mostly concrete design PEER 2007 IB Meeting
Example: San Francisco Rincon Tower; 60 -story RC PEER 2007 IB Meeting
PEER Tall Buildings Initiative Goal: To develop seismic design guidelines for tall buildings Multi-year, multi-institution, multi-sponsor n NSF, FEMA, CSMIP, Pankow, USGS, SCEC, City of SF, City of LA Management Committee J. Moehle: PI Y. Bozorgnia, N. Abrahamson, M. Lew, P. Somerville R. Hamburger, H. Krawinkler, M. Moore, F. Naeim R. Lui PEER 2007 IB Meeting
TBI Tasks Research tasks n n n Consensus performance objectives (Holmes) Tall building analyses & sensitivity to ground motions (Moehle) Synthetically generated ground motions (Somerville) Review of synthetically generated ground motions (Naeim) Guidelines on ground motion selection & modification (Bozorgnia) Guidelines on modeling and acceptance criteria (ATC/Malley) Input ground motions for tall buildings with subterranean levels (Stewart) Other tasks to be defined…. Guidelines for seismic design of tall buildings Workshops, presentations, etc. Final report to sponsoring organizations PEER 2007 IB Meeting
Mitigation of Seismic Risk in Older Concrete Buildings NEES-R Grand Challenge It is a five-year multi-institution research program
Project Team Disciplines: Seismic hazard Disciplines: Inventory Seismic hazard Simulation Inventory Laboratory Simulation Field Laboratory Building Field Regional Building Public policy Regional EOT Public policy Management EOT Management PEER 2007 IB Meeting Moehle Anagnos Comerio Stewart Ramirez Leadership team May Mosalam Matamoros Hutchinson Steele Lopez
Project thesis Available guidelines are too conservative n n most buildings are found inadequate retrofit costs are high This “always bad” message n n California, 1994 is not credible Can we identify the “killer buildings”? Improved procedures n can make retrofit programs feasible PEER 2007 IB Meeting Turkey, 2003
Research program tasks Inventory one or two major cities Test critical components to collapse Investigate simple retrofit methods Systems studies, including soilfoundation-structure interaction Improved computer simulation Regional simulation PEER 2007 IB Meeting Craft and evaluate appropriate policies n Identify different classes of the problem w Structural configuration w Occupancy w Economic conditions n n n Identify feasible mechanisms Model risk reduction impacts Evaluate economic impacts
Collaborations with existing organizations ASCE Standards Committees EERI Concrete Coalition American Concrete Institute Applied Technology Council PEER 2007 IB Meeting
PEER Lifelines Program… Another Sponsored Program
PEER Lifelines Program Goal: To improve safety and reliability of lifelines > 110 Projects Have Been Initiated NGA Ground Motion Database & Attenuation Models Previous Data New Data PEER 2007 IB Meeting
PEER Lifelines Program: Main Accomplishment Effective Collaboration among: Engineers -disciplines) (multi n Scientists disciplines) USGS Researchers n UC Berkeley Funding agencies n UC Santa Barbara (multi- n San Diego State U. Practitioners n n End users PEER 2007 IB Meeting Student U. Nevada Private Industry Caltrans USGS Private Industry
PEER Lifelines Program Will Continue Beyond Year 10… PEER LL Program is mainly supported by the State of CA and private funding For example, we have a current large contract with Caltrans for: n PEER 2007 IB Meeting Research on seismic performance of lifelines
Next Generation Attenuation (NGA) Models for Western US
Compiled One of the Largest Uniformly-Processed Recorded Ground Motion Databases in the World 173 worldwide earthquakes > 10, 500 The uniformly is fully database available to the processed public: records http: //peer. berkeley. edu /nga/ Previous Data New Data PEER 2007 IB Meeting
NGA models are for… Ground motion parameters: n n Magnitude range: § 5. 0 - 8. 0+ Horizontal components Distance range: PGA, PGV, PGD Fault Mechanism: Pseudo spectral acceleration at 5% damping § Strike-Slip § Reverse § Normal Site Effects §Vs 30 Period: 0 - 10 sec PEER 2007 IB Meeting § 0 – 200 km
Impact of NGA Models on Seismic Design USGS has extensively reviewed NGA, and is adopting the NGA models for the US National Seismic Hazard Maps Design spectra based on either deterministic or probabilistic approach will be affected by NGA models PEER 2007 IB Meeting
Impact of NGA on National Seismic Hazard Maps Period=1. 0 sec Spectra 2% Probability of Exceedance in 50 years Ratio of New/Old: Using 3 NGA relations Versus: 2002 Hazard Maps Abrahamson and Silva (1997), Sadigh et al. (1997), Boore et al. (1997), Campbell and Bozorgnia (2003), Spudich et al. (1999) for extensional areas Preliminary Map PEER 2007 IB Meeting
NGA Reports & Papers Final reports are available at PEER web site Including computer files of the models Journal papers will be published in special issue of EERI Earthquake Spectra, March 2008 PEER 2007 IB Meeting
NGA- East PEER just signed a contract with the US Nuclear Regulatory Commission (NRC) to initiate a major multidisciplinary, multiyear program for: n Next Generation Attenuation (NAG) Models for Central & Eastern US (NGA -East) PEER 2007 IB Meeting
Thank You!
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