Pacific Earthquake Engineering

Research Center (PEER)

PEERPEER

Leadershipteam

PEER MissionPEER Mission

• Advance performance-based earthquake engineering to meet the needs of various stakeholders.

PEER MissionPEER Mission

• Advance performance-based earthquake engineering to meet the needs of various stakeholders.

Performance-based earthquake Performance-based earthquake engineeringengineering

Design for the achievement of specified results rather than adherence to prescribed means.

(after May 2004)

OPEN

Prescriptive design approachPrescriptive design approach

WR

CIVdesign

• Linear analysis model

• Prescribed strength

• The outcome:

• performance an undefined byproduct of design

• limited role for engineer

• Prescriptive details

UBC 97, IBC 2000, etc.

Base Shear

Deformation

Damage Threshold

CollapseOnset

OPEN

OPEN

OPEN

FEMA 356 Performance Levels

IO LS CP

Performance-Based Earthquake Performance-Based Earthquake Engineering ConceptsEngineering Concepts

PBEE today

$, % replacement0 25% 50% 100%

Downtime, days0 1 7 30 180

Casualty rate0.0 0.0001 0.001 0.01 0.25

PEER contribution

Engineering Demand Parameter

Engineering Demand Parameterdrift as an EDP

Intensity Measure Intensity Measure

Damage MeasureDamage Measure

PBEE Approach and ApplicationPBEE Approach and Application

structural

nonstructural

Capital Losses

Decision VariableDecision Variable