AISC has limits on slenderness for braces in Specieal Concentrically Braced Frames. Below is section 13.2a.
"Bracing members shall have Kl/r < 4*(E/Fy)^.5
Exception: 4*(E/Fy)^.5 < Kl/r < 200 are permitted in frames in which the available strength of the column is at least equal to the maximum...
In a two way PT floor the distributed tendons are usually stressed (100%) first. This would create a line of uplift at midspan and a line of downward force along the column lines. This increase in force is not accounted for in the shoring designs of most contractors. Although the loading is...
