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Hosseini, Mahsa

University of British Columbia

Conventional Construction concrete shear walls are categorized as one of forty-five seismic force-resisting systems (SFRS) in the National Building Code of Canada (NBC). NBC specifies seismic force modification factors, such as ductility-related factors (Rd) and overstrength-related factors (Ro), with values of 1.5 and 1.3 for conventional construction concrete shear walls, respectively. Values for these parameters are largely based on engineering judgment without a systematic calculation. To address this, the National Research Council (NRC) developed a performance-based unified (PBU) procedure. For the first time in Canada, this research systematically calculates the seismic force modification factors of conventional reinforced concrete shear walls in Canada using the PBU procedure. The study has two primary objectives: (1) to propose revised seismic force modification factors, specifically the ductility-based force reduction factor (Rd) and the overstrength-based force reduction factor (Ro), for conventional reinforced concrete shear walls, and (2) to validate and enhance the efficiency of the PBU methodology. The process involves a comprehensive literature review of seismic force modification factors from Canadian and U.S. design guidelines. Various conventional reinforced concrete shear wall archetypes are designed according to CSA A23.3 and analyzed through nonlinear modelling, pushover, and Incremental Dynamic Analyses (IDA). The PBU methodology is applied to calculate Rd and Ro values, then compared with the NBC recommendations. Revised Rd and Ro values are proposed based on the analyses. These values are used to revise initial designs and re-evaluate their effectiveness. The final phase of the study focuses on evaluating the PBU methodology itself, identifying its strengths and weaknesses, and suggesting improvements. This research contributes to proposing revised seismic force modification factors and refining the PBU methodology. It provides essential data for systematically developing seismic force modification factors for conventional construction reinforced concrete shear walls, moving away from judgment-based approaches in the National Building Code.

Text

2025-02-24

Attribution-NonCommercial-NoDerivatives 4.0 International

http://hdl.handle.net/2429/90414

Civil Engineering

University of British Columbia

UBCV

http://creativecommons.org/licenses/by-nc-nd/4.0/