I. Pacific Earthquake Engineering Research Center (PEER) II. Post-Earthquake Investigations III. Seismic Retrofit at UC Berkeley

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I. Pacific Earthquake Engineering Research Center
(PEER)II. Post-Earthquake InvestigationsIII.
Seismic Retrofit at UC Berkeley

• Yousef Bozorgnia, Ph.D., P.E.
• Associate Director,
• Pacific Earthquake Eng. Research Center (PEER)
• University of California, Berkeley

April 15, 2008
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Research projects at PEER are organized into four
Thrust Areas
TA IV Simulation Information Technologies
PBEE Methodology
Deierlein May
Fenves Elgamal
(earthquake hazard characterization)
(simulation, databases, and visualization)
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Thrust Area III Lifelines Program

• Goal To improve safety and reliability of
  Lifelines systems
• gt 120 Projects Have Been Initiated

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Example Project Seismic Performance of
Electrical Equipment Networks
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Seismic Performance of Electrical
EquipmentExample Response of 500kV switch
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Seismic Performance of Electrical
EquipmentExample Response of 500V switch
Full scale testing of 500 kV switch
Investigators G. Fenves (UCB), S. Takhirov
(UCB), A. Filiatrault (SUNY)
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Several Projects on Engineering Characterization
of Ground MotionExampleNext Generation
Attenuation (NGA) Models
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An Attenuation Model
And, location and characteristics of the site
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Compiled One of the Largest Uniformly-Processed
Strong-Motion Databases in the World

• 173 worldwide earthquakes

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Database is available to the public
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Example of ResultsCampbell-Bozorgnia Predicted
Acceleration SpectraStrike Slip, M 7.0, VS30
760 m/s
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Impact of NGA Spectra on Design

• USGS has reviewed NGA and is adopting the NGA
  models for the US National Hazard Maps
• Design spectra based on either deterministic or
  probabilistic approach will be affected by NGA
  models

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A Separate TopicAn Example of
Post-Earthquake Investigation
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Post-EQ Investigation

• Is carried out by most of earthquake centers in
  the US
• Is carried out in collaboration with the host
  country
• Goal is to learn from earthquakes

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Post-Earthquake Investigations to Evaluate
Performance of Structures and Lifelines

• More than 37 Years Ago

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An Example 1999 Kocaeli EQ in Turkey
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Earthquakes in the Middle East
Azarbaijan
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In 1999 Two Major Earthquakes Happened in Turkey
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Building Collapse and Pounding in Adapazari
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Oil Facilities Severely Damaged in the 1999
Earthquake in Turkey
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Izmit Refinery, Turkey, 1999
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Izmit Refinery, Turkey, 1999
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Izmit Refinery, Turkey, 1999
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Following the 1999 EQs in Turkey

• World Bank and EU financed major studies on
  seismic vulnerability assessment of facilities in
  Turkey
• Including their refineries

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A Separate TopicSeismic Upgrade of
Buildings at UC Berkeley
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Location On Top of the Hayward Fault
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Hearst Mining Building, UC Berkeley Seismic
Retrofit by Base-Isolation
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Hildebrand Hall
137,000 Sq. Ft.
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New Buildings for Labs and Residence Halls
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Thank You!