2205.3 Seismic requirements for composite construction.

2205.4 Modifications to AISC 341, Part I, Section 13, Special Concentrically Braced Frames (SCBF) Modifications.

Add a new section as follows:

AISC 341, 13.2f -- Member Types. The use of rectangular HSS are not permitted for bracing members, unless filled solid with cement grout having a minimum compressive strength of 3000 psi (20.7 MPa) at 28 days. The effects of composite action in the filled composite brace shall be considered in the sectional properties of the system where it results in the more severe loading condition or detailing. (Ord. 2007-0108 § 14, 2007.)