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NUMERICAL SIMULATION OF URM INFILL WALLS in RC FRAMES: CRITICAL MODELING ASPECTS

NUMERICAL SIMULATION OF URM INFILL WALLS in RC FRAMES: CRITICAL MODELING ASPECTS. KHALID m. mosalam UNIVERSITY OF CALIFORNIA, BERKELEY. Motivation. URM Infill Walls in RC Buildings Benefits S ignificant effects on functionality

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NUMERICAL SIMULATION OF URM INFILL WALLS in RC FRAMES: CRITICAL MODELING ASPECTS

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  1. NUMERICAL SIMULATION OF URM INFILL WALLS in RC FRAMES:CRITICAL MODELING ASPECTS KHALID m. mosalam UNIVERSITY OF CALIFORNIA, BERKELEY

  2. Motivation URM Infill Walls in RC Buildings • Benefits • Significant effects on functionality • Contribute to lateral force resisting capacity & damping up to a certain hazard level • Increase the overall stiffness – may have benefits for certain cases • Detrimental Effects • Sudden brittle failure: High potential to form a soft story during shaking • Interaction with the frame: Shear failure of columns • In plane/out of plane interaction: Reduced capacity in both directions • In plane/out of plane interaction:Debris from out of plane failure, life safety concerns • Torsional effects due to asymmetric wall arrangement in plan Quantification of detrimental effects requires proper modeling

  3. Motivation Soft Story: Kocaeli EQ, Turkey, 1999 (left) Haiti EQ, 2010 (right) In-plane /out-of-plane interaction: Wenchuan EQ, China, 2008 Frame-URM interaction: L’Aquila EQ, Italy, 2009

  4. Critical Modeling Aspects In-plane/Out-of-plane Interaction: General modeling

  5. Critical Modeling Aspects In-plane/Out-of-plane Interaction: Section discretization

  6. Critical Modeling Aspects URM infill removal upon failure Integration time step i-1 Integration time step i @Integration time step i

  7. Critical Modeling Aspects URM wall removal upon failure: Algorithm

  8. Critical Modeling Aspects Shear failure of columns Shear springs with nonlinear force displacement relationship

  9. Numerical Simulations For Retrofit Rocking spine retrofit Courtesy of Tipping Mar, Berkeley

  10. Numerical Simulations For Retrofit Rocking spine retrofit Courtesy of Tipping Mar, Berkeley

  11. Numerical Simulations For Retrofit Rocking spine retrofit: Dynamic analysis with critical modeling aspects Maximum inter-story drift profile

  12. Numerical Simulations For Retrofit Rocking spine retrofit: Dynamic analysis with critical modeling aspects Fragility curves

  13. Thank you

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