Framework for PerformanceBased Earthquake Engineering PBEE O P

Framework for Performance-Based Earthquake Engineering (PBEE) O P E N The PEER mission is to develop and disseminate technologies to support PBEE. The approach is aimed at improving decision-making about seismic risk by making the choice of performance goals and the tradeoffs that they entail apparent to facility owners and society at large. Base Shear Collapse Onset Deformation PBEE yesterday IO LS PBEE today 25% 0 0. 0001 1 0 Measures of Performance: • Collapse & Casualties • Collapse • Direct&Casualties Financial Loss • Direct Financial Loss • Downtime O P E N Damage Threshold 0. 0 Decision Variable O P E N 50% 100% 0. 001 0. 01 7 FEMA 356 Performance Levels CP 30 $, % replacement Casualty risk 0. 25 Downtime, days 180 ATC-58 definitions of performance assessment types Intensity-based: Probable facility performance, given intensity of ground motion Scenario-based: Probable facility performance, given a specific earthquake scenario Time-based: Probable facility performance in a specified period of time Damage Fragility Curves Cost Functions Drywall Partitions with Metal Frame P(DM>dm | EDP) P($>x | DM) 1. 0 Damage Measure Mean Loss Curve Drywall partitions 1. 0 0. 8 + 0. 6 0. 4 DM 1 0. 2 DM 3 0. 010 EDP (IDR) 0. 015 Tape, Paste & Repaint Replacement of gypsum boards Partition replacement 0. 005 0. 4 0. 2 DM 2 0. 000 0. 6 0. 020 0. 4 0. 8 1. 2 1. 6 2. 0 Cost of Repair / Cost New 2. 4 Engineering Demand Parameter drift as an EDP Intensity Measure Medina, 2002 Structural System Selection Based on Loss Risk IM Impact – Implementation: IM • ATC-58 – Guidelines for Seismic Performance Assessment of Buildings • ATC-63 – Recommended Methodology for Quantification of Building System Performance Stiff Systems: Larger loss in acceleration sensitive components and smaller loss in drift sensitive components • TBI – Tall Building Initiative • LRFD for bridge design Flexible Systems: Small loss in acceleration sensitive components and larger loss in drift sensitive components Zareian, 2006 The Pacific Earthquake Engineering Research Center headquarters at the University of California, Berkeley for more information see http: //peer. berkeley. edu Poster by H. Krawinkler and G. Deierlein (Stanford University)