Quantification of Seismic Performance Factors of Y-Bracing

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Faghih, Ashkan | 2011

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 42638 (09)
University: Sharif University of Technology
Department: Civil Engineering
Advisor(s): Mofid, Massoud
Abstract:
A particular kind of concentric bracing system composed of three members arranged in y-shaped geometry is examined in this thesis. The non-straight diagonal strut of this off-centre bracing causes eccentricity to the system and is connected to the frame corner through a third member. Providing adequate openings in braced bays accompanied by improved energy dissipation are resulted in positive attitude toward using y-bracing frame as a lateral load resisting system. However, lacking of specific design codes could be problematic for engineers. To overcome this incompetency, seismic performance factors including the response modification coefficient, the system overstrength factor, and deflection amplification factor have been evaluated by performing nonlinear static and nonlinear dynamic analysis for a set of design archetypes with y-bracing system. The methodology recommended by the Federal Emergency Management Agency in June 2009 (FEMA P695) is used to reliably quantify y-bracing system performance and response parameters in areas subjected to moderate-to-severe earthquakes
Keywords:
Structure Behavior Coefficient ; Ductility Factor ; Incremental Dynamic Analysis ; Y-Bracing ; Bracing ; Overstrength Column Factor

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