Effective Seismic Design of Reinforced Concrete Buildings with Different Ductility Levels

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Shear walls and coupled walls are common seismic force resisting systems (SFRS) that are used for reinforced concrete (RC) buildings. According to the National Building Code of Canada (NBCC 2010), the SFRS of reinforced concrete buildings are classified based on their ductility level as ductile, moderately ductile and conventional construction systems. The designer's selection of the SFRS level of ductility is primarily governed by the building location, building characteristics, and the height limitations of the code. The objective of the proposed research project is to evaluate the effect of selected SFRS level of ductility on the estimated construction cost and the seismic performance of RC shear wall buildings. The research project will include two phases; the first phase will investigate the effect of ductility level on RC shear wall buildings, whereas the second phase will focus on RC buildings with coupled walls. For each phase, four multi-storey buildings with different heights (representing low, medium and high rise) located in three different cities in Canada will be selected. For each building height and location, the SFRS will be designed according to the most recent NBCC 2015 and Canadian Standard Association CSA A23.3-14 using the Dynamic Analysis Procedure as ductile, moderately ductile, or conventionally constructed system. The seismic performance and cost estimates will be evaluated for each ductility level of a specific SFRS. The proposed research will help the designers for most suitable selection of the ductility level of a SFRS that satisfies the code requirements, meanwhile provide the most economic choice. The outcome of this project has a direct environmental/economic benefit to the construction industry in Canada. In addition to the savings associated with effective design of seismic force resisting systems, the outcome of this research has a positive environmental impact through the reduction of concrete and steel quantities used, hence reducing emissions associated with concrete production processes.