PEER “Sponsored” Research Projects Yousef Bozorgnia, Ph.D., P.E. PEER Associate Director October 9, 2007

PEER 2007 IB Meeting Sponsored Research Projects Those partially or fully funded by outside the PEER “core” (i.e., PEER NSF or State matching funds) Funding from: NSF Caltrans California Energy Commission (CEC) PG&E Bonneville Power Administration (BPA) FEMA BART California Earthquake Authority (CEA) Pankow Foundation Funding from: California Strong Motion Instrumentation Program (CSMIP) California Earthquake Authority (CEA) US Department of Energy (DOE) US Nuclear Regulatory Commission (NRC) City & County of SF City of LA

PEER 2007 IB Meeting 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: Western US (NGA-West) Central & Eastern US (NGA-East)

PEER 2007 IB Meeting 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, Sacramento, Seattle Mostly concrete design Tall Buildings Initiative

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 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 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

Mitigation of Seismic Risk in Older Concrete Buildings NEES-R Grand Challenge It is a five-year multi-institution research program

PEER 2007 IB Meeting Moehle Comerio Ramirez Project Team Anagnos Leadership team Disciplines:  Seismic hazard  Inventory  Simulation  Laboratory  Field  Building  Regional  Public policy  EOT  Management Stewart Mosalam Hutchinson May Matamoros Steele Lopez Disciplines:  Seismic hazard  Inventory  Simulation  Laboratory  Field  Building  Regional  Public policy  EOT  Management

PEER 2007 IB Meeting Project thesis Available guidelines are too conservative most buildings are found inadequate retrofit costs are high This “always bad” message is not credible Can we identify the “killer buildings”? Improved procedures can make retrofit programs feasible California, 1994 Turkey, 2003

PEER 2007 IB Meeting Research program tasks Inventory one or two major cities Test critical components to collapse Investigate simple retrofit methods Systems studies, including soil- foundation-structure interaction Improved computer simulation Regional simulation Craft and evaluate appropriate policies Identify different classes of the problem  Structural configuration  Occupancy  Economic conditions Identify feasible mechanisms Model risk reduction impacts Evaluate economic impacts

PEER 2007 IB Meeting Collaborations with existing organizations ASCE Standards Committees EERI Concrete Coalition American Concrete Institute Applied Technology Council

PEER Lifelines Program… Another Sponsored Program

PEER 2007 IB Meeting Previous Data New Data NGA Ground Motion Database & Attenuation Models Goal: To improve safety and reliability of lifelines > 110 Projects Have Been Initiated PEER Lifelines Program

PEER 2007 IB Meeting PEER Lifelines Program: Main Accomplishment Effective Collaboration among: Engineers (multi-disciplines) Scientists (multi-disciplines) Funding agencies Researchers Practitioners End users USGS Private Industry Caltrans Private Industry USGS UC Berkeley UC Santa Barbara San Diego State U. U. Nevada Student

PEER 2007 IB Meeting PEER Lifelines Program Will Continue Beyond Year 10… For example, we have a current large contract with Caltrans for: Research on seismic performance of lifelines PEER LL Program is mainly supported by the State of CA and private funding

Next Generation Attenuation (NGA) Models for Western US

PEER 2007 IB Meeting Previous Data 173 worldwide earthquakes Compiled One of the Largest Uniformly-Processed Recorded Ground Motion Databases in the World New Data > 10,500 uniformly processed records The database is fully available to the public: nga/

PEER 2007 IB Meeting Ground motion parameters : Horizontal components PGA, PGV, PGD Pseudo spectral acceleration at 5% damping Period: sec NGA models are for… Magnitude range:  Fault Mechanism:  Strike-Slip  Reverse  Normal Site Effects  V s30 Distance range:  0 – 200 km

PEER 2007 IB Meeting 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 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 Impact of NGA on National Seismic Hazard Maps

PEER 2007 IB Meeting NGA Reports & Papers Including computer files of the models Final reports are available at PEER web site Journal papers will be published in special issue of EERI Earthquake Spectra, March 2008

PEER 2007 IB Meeting NGA- PEER just signed a contract with the US Nuclear Regulatory Commission (NRC) to initiate a major multidisciplinary, multi- year program for: Next Generation Attenuation (NAG) Models for Central & Eastern US (NGA-East) East

Thank You!