In the case of seismic frames, where the moments are introduced via the beam-column connections,
Ct = 1. Strictly speaking, the correct solution would be to use the commentary equation with Ct = 1 and Cd = 1 at all locations except for braces at the inflection point where Cd = 2. The current Provisions imply that the product of Ct (Cd ) = 2.0 by the implied value of Ct = 2 and Cd = 1.