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