PEER “Sponsored” Research Projects Yousef Bozorgnia, Ph.D., P.E. PEER Associate Director October...
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Transcript of PEER “Sponsored” Research Projects Yousef Bozorgnia, Ph.D., P.E. PEER Associate Director October...
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PEER “Sponsored” Research Projects
Yousef Bozorgnia, Ph.D., P.E.PEER Associate DirectorOctober 9, 2007
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PEER 2007 IB Meeting
Sponsored Research ProjectsThose 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
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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)
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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
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PEER 2007 IB Meeting
Example: San Francisco Rincon Tower; 60-story RC
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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 CommitteeJ. Moehle: PIY.Bozorgnia, N. Abrahamson, M. Lew, P.
SomervilleR. Hamburger, H. Krawinkler, M. Moore, F. NaeimR. Lui
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PEER 2007 IB Meeting
TBI TasksResearch 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
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Mitigation of Seismic Risk in Older Concrete Buildings
NEES-R Grand Challenge
It is a five-year multi-institution research program
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PEER 2007 IB Meeting
Moehle Comerio Ramirez
Project Team
Anagnos
Leadershipteam
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
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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
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PEER 2007 IB Meeting
Research program tasksInventory one or two major citiesTest critical components to collapseInvestigate simple retrofit methodsSystems studies, including soil-foundation-structure interactionImproved computer simulationRegional 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
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PEER 2007 IB Meeting
Collaborations with existing organizations
ASCE Standards CommitteesEERI Concrete CoalitionAmerican Concrete InstituteApplied Technology Council
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PEER Lifelines Program…Another Sponsored Program
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PEER 2007 IB Meeting
0 . 1 1 1 0 1 0 0 1 0 0 0Distance (km )
4
5
6
7
8
Mag
nit
ude
Previous Data
0 . 1 1 1 0 1 0 0 1 0 0 0Distance (km )
4
5
6
7
8
Mag
nit
ude
New Data
Atten 805r, PEN, SS, Rrup=10.0 km, Vs30=760, D=1
0.01 0.1 1 10
Period (sec)
0.0001
0.001
0.01
0.1
1
Sp
ectr
al
Ac
cele
rati
on
(g
)
M=7.5
6.5
5.5
4.5
C&B 2003
C&B 2005 NGA
NGA Ground Motion Database & Attenuation Models
Goal: To improve safety and reliability of lifelines
> 110 Projects Have Been Initiated
PEER Lifelines Program
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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 Berkele
y
UC Santa
BarbaraSan
Diego State
U.
U. Nevada
Student
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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
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Next Generation Attenuation (NGA) Models for Western US
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PEER 2007 IB Meeting
0 . 1 1 1 0 1 0 0 1 0 0 0Distance (km )
4
5
6
7
8
Mag
nit
ud
e
Previous Data
173 worldwide earthquakes
Compiled One of the Largest Uniformly-Processed Recorded Ground Motion Databases in the World
0 . 1 1 1 0 1 0 0 1 0 0 0Distance (km )
4
5
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Mag
nit
ud
e
New Data
> 10,500 uniformly processed records
-0.5
0.0
0.5
Ac
ce
l. (g
)
-0.5
0.0
0.5
Ac
ce
l. (g
)
PS10, 47 Deg.
PS10, Vertical
20 25 30 35 40
-0.5
0.0
0.5
Ac
ce
l. (g
)
PS10, 317 Deg.
2002 Denali (A laska) EQ, Pum p Station 10
0.01 0.1 1 10Period (sec)
0
0.5
1
1.5
Sp
ec
tra
l A
cc
ele
rati
on
(g
)
The database is fully available to the public:
http://peer.berkeley.edu/nga/
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PEER 2007 IB Meeting
Ground motion parameters:
Horizontal components
PGA, PGV, PGD
Pseudo spectral acceleration at 5% damping
Period: 0 - 10 sec
NGA models are for… Magnitude range: 5.0 - 8.0+
Fault Mechanism: Strike-Slip Reverse Normal
Site EffectsVs30
Distance range: 0 – 200 km
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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
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PEER 2007 IB Meeting
Period=1.0 sec Spectra2% Probability of Exceedance in 50 years
Ratio of New/Old:Using 3 NGA relationsVersus:2002 Hazard MapsAbrahamson and Silva (1997),Sadigh et al. (1997), Boore et al. (1997),Campbell and Bozorgnia (2003),Spudich et al. (1999) for extensionalareas
Preliminary Map
Impact of NGA on National Seismic Hazard Maps
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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
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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
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Thank You!