Prof. Khalid Mosalam University of California, Berkeley.

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Presentation transcript:

Prof. Khalid Mosalam University of California, Berkeley

NUMERICAL SIMULATION OF URM INFILL WALLS in RC FRAMES: CRITICAL MODELING ASPECTS KHALID M. MOSALAM UNIVERSITY OF CALIFORNIA, BERKELEY 15WCEE, Lisbon, Portugal, September 24-28, 2012 Special Session 24.1 Seismic Retrofit of Masonry Structures. Monday, 24 September 2012

Motivation 3 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 15WCEE, Lisbon, Portugal, September 24-28, 2012 Special Session 24.1 Seismic Retrofit of Masonry Structures. Monday, 24 September 2012

Motivation 4 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, WCEE, Lisbon, Portugal, September 24-28, 2012 Special Session 24.1 Seismic Retrofit of Masonry Structures. Monday, 24 September 2012

Critical Modeling Aspects 5 In-plane/Out-of-plane Interaction: General modeling 15WCEE, Lisbon, Portugal, September 24-28, 2012 Special Session 24.1 Seismic Retrofit of Masonry Structures. Monday, 24 September 2012

6 In-plane/Out-of-plane Interaction: Section discretization Critical Modeling Aspects 15WCEE, Lisbon, Portugal, September 24-28, 2012 Special Session 24.1 Seismic Retrofit of Masonry Structures. Monday, 24 September 2012

7 URM infill removal upon failure Critical Modeling Aspects Integration time step i-1 Integration time step time step i 15WCEE, Lisbon, Portugal, September 24-28, 2012 Special Session 24.1 Seismic Retrofit of Masonry Structures. Monday, 24 September 2012

8 URM wall removal upon failure: Algorithm Critical Modeling Aspects 15WCEE, Lisbon, Portugal, September 24-28, 2012 Special Session 24.1 Seismic Retrofit of Masonry Structures. Monday, 24 September 2012

9 Shear failure of columns Critical Modeling Aspects Shear springs with nonlinear force displacement relationship 15WCEE, Lisbon, Portugal, September 24-28, 2012 Special Session 24.1 Seismic Retrofit of Masonry Structures. Monday, 24 September 2012

10 Rocking spine retrofit Numerical Simulations For Retrofit Courtesy of Tipping Mar, Berkeley 15WCEE, Lisbon, Portugal, September 24-28, 2012 Special Session 24.1 Seismic Retrofit of Masonry Structures. Monday, 24 September 2012

11 Rocking spine retrofit Numerical Simulations For Retrofit Courtesy of Tipping Mar, Berkeley 15WCEE, Lisbon, Portugal, September 24-28, 2012 Special Session 24.1 Seismic Retrofit of Masonry Structures. Monday, 24 September 2012

12 Rocking spine retrofit: Dynamic analysis with critical modeling aspects Numerical Simulations For Retrofit Maximum inter-story drift profile 15WCEE, Lisbon, Portugal, September 24-28, 2012 Special Session 24.1 Seismic Retrofit of Masonry Structures. Monday, 24 September 2012

13 Numerical Simulations For Retrofit Fragility curves 15WCEE, Lisbon, Portugal, September 24-28, 2012 Special Session 24.1 Seismic Retrofit of Masonry Structures. Monday, 24 September 2012 Rocking spine retrofit: Dynamic analysis with critical modeling aspects

Thank you 14 15WCEE, Lisbon, Portugal, September 24-28, 2012 Special Session 24.1 Seismic Retrofit of Masonry Structures. Monday, 24 September 2012