ABSTRACT
Steel concentrically-braced frame (CBF) systems are stiff and economical earthquake-resistant steel frame systems, which often exhibit limited system ductility capacity. The ductility capacity can be increased through the use of buckling-restrained braces (e.g., Fahnestock et al. 2003); however, the buckling-restrained braced frame system sometimes exhibits significant residual drift after an earthquake. To increase the ductility and reduce the residual drift of CBFs, self-centering concentrically-braced frame (SC-CBF) systems are being developed.
