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Kyle Marshall, David Grilli , Graduate Student Researchers, UC Davis

Forensic analysis of Eccentrically Braced Frame Fracture during the 2/22/11 Christchurch, NZ Earthquake. Kyle Marshall, David Grilli , Graduate Student Researchers, UC Davis Amit Kanvinde, Associate Professor, UC Davis. The issue – first observed field fractures worldwide in an EBF

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Kyle Marshall, David Grilli , Graduate Student Researchers, UC Davis

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  1. Forensic analysis of Eccentrically Braced Frame Fracture during the 2/22/11 Christchurch, NZ Earthquake Kyle Marshall, David Grilli, Graduate Student Researchers, UC Davis Amit Kanvinde, Associate Professor, UC Davis The issue – first observed field fractures worldwide in an EBF Parking garage, Christchurch Hospital, Christchurch, NZ Data collected/synthesized • Fractured components obtained • 3-d scans conducted to regenerate as-built geometrical features • Building drawings, site ground motions obtained • Nonlinear time history simulations conducted to obtain link deformations Experiments and simulations • Coupons extracted from components • Charpy V Notch, Stress Strain and Fracture Mechanics Tests conducted • Material properties obtained from these tests used in conjunction with deformation histories from frame simulations to conduct detailed fracture mechanics finite element simulations of components Continuum FEM simulation of fractured region Preliminary findings • Steel meets toughness requirements • Demands are not entirely unexpected, although severe • Fracture is likely due to poor detailing • More stringent detailing guidelines and enforcement would prevent such failure in the United States and elsewhere Sponsor: National Science Foundation, Industry and New Zealand Partners: Geoff Bomba, ForellElsesser Engineers, San Francisco, CA; Chris Allington, Holmes Consulting, Christchurch, NZ,

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