Abstract
The purpose of this paper is to investigate the structural characteristics of a dual system moment frame and concentrically braced frame with a friction damper (CBFD). The experimental test involves the design, detailing, fabrication, and testing of a full-scale dual system frame on a uniaxial shake table subjected to 16 scaled ground motions of various intensities and amplitudes and eight artificially generated sinusoidal, sweep and step functions. The dual system utilized for this testing includes two ordinary moment-resisting frames and a single ordinary concentric braced frame with and without an inline friction damper. Overall, the friction damped braced system decreased the system acceleration by 25 percent at the frame deck. The friction-damped brace increased the damping of the dual system frame by 6.7 percent while maintaining story drift below 1.7 percent. The residual frame story drifts demonstrated that the ordinary moment-resisting frames participated as re-centering frames correcting any residual elongation in the friction damper. Overall, the inline friction damper assembled within the dual system frame demonstrated enhanced structural performance and resiliency.
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