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

PEER “Sponsored” Research Projects

Yousef Bozorgnia, Ph.D., P.E.PEER Associate DirectorOctober 9, 2007

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


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)


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


Example: San Francisco Rincon Tower; 60-story RC


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


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

Mitigation of Seismic Risk in Older Concrete Buildings

NEES-R Grand Challenge

It is a five-year multi-institution research program


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


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


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


Collaborations with existing organizations

ASCE Standards CommitteesEERI Concrete CoalitionAmerican Concrete InstituteApplied Technology Council

PEER Lifelines Program…Another Sponsored Program


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


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


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


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

6

7

8

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/


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


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


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


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


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!

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

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