July 21-23, 2006 July 21-23, 2006 NEES Annual Meeting NEES Annual Meeting 1 NEESR-SG NEESR-SG Seismic Performance Assessment Seismic Performance Assessment and Retrofit of Non-Ductile RC and Retrofit of Non-Ductile RC Frames with Infill Walls Frames with Infill Walls P. Benson Shing, Jose Restrepo, and Andreas Stavridis University of California, San Diego Kaspar Willam, Sivaselvan Mettupalayam, and Ben Blackard University of Colorado, Boulder Sarah Billington and Marios Kyriakides Stanford University George E. Brown, Jr. Network for Earthquake Engineering Simulation
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July 21-23, 2006 NEES Annual Meeting 1 NEESR-SG Seismic Performance Assessment and Retrofit of Non-Ductile RC Frames with Infill Walls P. Benson Shing,
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July 21-23, 2006July 21-23, 2006 NEES Annual MeetingNEES Annual Meeting 11
NEESR-SGNEESR-SGSeismic Performance Seismic Performance Assessment and Retrofit of Non-Assessment and Retrofit of Non-Ductile RC Frames with Infill Ductile RC Frames with Infill WallsWalls
P. Benson Shing, Jose Restrepo, and Andreas StavridisUniversity of California, San Diego
Kaspar Willam, Sivaselvan Mettupalayam, and Ben BlackardUniversity of Colorado, Boulder
Sarah Billington and Marios KyriakidesStanford University
George E. Brown, Jr. Network for Earthquake Engineering Simulation
July 21-23, 2006July 21-23, 2006 NEES Annual MeetingNEES Annual Meeting 22
2000 Kocaeli, Turkey Earthquake (EERI)
Performance IssuesPerformance Issues
• Non-uniform infill –Non-uniform infill – open bottom storyopen bottom story
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Beneficial Influence of InfillBeneficial Influence of InfillNegro et al. (1996)
Bare Frame
Infilled Frame
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Main IssueMain Issue
Brittle shear failure of columnsBrittle shear failure of columns Strength degradation of infill Strength degradation of infill
and columns leading to soft and columns leading to soft story mechanismstory mechanism
Soft Story
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Questions to be AnsweredQuestions to be Answered
What is the threshold ground motion What is the threshold ground motion level beyond which an infilled frame level beyond which an infilled frame will have undesirable performance?will have undesirable performance?
How can we raise this threshold with How can we raise this threshold with cost-effective strengthening?cost-effective strengthening?
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State of the PracticeState of the Practice
Lack of reliable analysis tools for Lack of reliable analysis tools for sound engineering decisions sound engineering decisions
Contribution of infill walls to seismic Contribution of infill walls to seismic resistance difficult to assessresistance difficult to assess
Lack of proven cost-effective Lack of proven cost-effective strengthening methods for infill wallsstrengthening methods for infill walls
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Joe MaffeiJoe MaffeiBill HolmesBill HolmesBret LizundiaBret Lizundia
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Professional Advisory PanelProfessional Advisory Panel
Joe Maffei, R&C (Chair)Joe Maffei, R&C (Chair) Dave Brieholz, BQEDave Brieholz, BQE John Kariotis, K&AJohn Kariotis, K&A Ron Mayes, SGHRon Mayes, SGH Paul Murray, PSDGPaul Murray, PSDG Mike Valley, MKAMike Valley, MKA Greg Kingsley, KLAGreg Kingsley, KLA
Ron Hamburger, SGH
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