Force Modification Factors and Capacity Design Procedures for Braced Timber Frames

Abstract eng:
The work presented in this paper is part of a research project conducted at FPInnovations Forintek with objective to quantify the seismic behaviour of braced timber frames with timber riveted connections. Results are presented from monotonic and cyclic tests conducted on diagonal brace members with riveted connections on both ends. Based on the results from the cyclic tests, non-linear analytical models were developed for diagonal brace members as well as for the entire braced frames. Using the DRAIN 2DX computer program, a series of non-linear static and time history dynamic analyses were performed. The acceleration records used for the analyses were chosen to satisfy the seismic zonal parameters for Vancouver, BC, Canada. Parameters that influence the seismic behaviour of braced timber frames are discussed, including estimates of the newly introduced ductility-based force modification factors (Rd factors) in the 2005 edition of the National Building Code of Canada (NBCC). Finally, the paper provides some guidelines on implementation of capacity design procedures for braced timber frames.

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