Assessment of the NBC Seismic Force Modification Factors for Moderately Ductile Steel Concentrically Braced Frames Using the Performance-Based Unified Procedure

The National Building Code (NBC) of Canada specifies ductility-related and overstrength-related seismic force modification factors, Rd, and Ro, for different seismic force-resisting systems (SFRSs), which are employed to determine the lateral earthquake force to be used in the design. Values for these factors have been derived largely based on engineering judgment and qualitative comparison of the seismic response of different SFRSs which, in turn, may result in different seismic performances depending on the SFRS, even though the structures are designed with the same building code.

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