Cold-formed Steel Shear Walls – 2006 IBC – update
This is to clarify the ICC-ES position on information being circulated regarding ICC-ES criteria AC130 and AC322 and their relationship to ICC-ES evaluation reports.
Prefabricated wood shear panels and cold-formed steel prefabricated shear walls are considered alternates under the International Building Code (IBC) and therefore require development of acceptance criteria if recognition in an ICC-ES evaluation report is sought. This has led to the development of AC130 (Acceptance Criteria for Prefabricated Wood Shear Panels) and AC322 (Acceptance Criteria for Prefabricated, Cold-formed, Steel Lateral-Force-Resisting Vertical Assemblies), both of which establish a structural relationship (equivalency) to wood shear walls recognized in the 2006 IBC [Table 2306.3.2 – IBC and Table 12.2-1 (item A.13) – ASCE 7-05]. These criteria have brought a significant change in how ICC-ES addresses seismic design of alternate shear-resisting elements. Through the ICC-ES open hearing process, the criteria incorporate the most recent information available on this subject.
There are currently several ICC-ES evaluation reports on prefabricated wood shear panels and cold-formed steel prefabricated shear walls based on the 1997 Uniform Building Code and the 2000 or 2003 IBC. Recent statements by others regarding extrapolation of information in these reports to gain equivalency to the 2006 IBC without explicitly meeting more recent criteria requirements are inaccurate. Current ICC-ES legacy reports based on earlier code editions and criteria should not be used as a basis of compliance with the 2006 IBC.
ICC-ES is preparing a memorandum noting the current ICC-ES position on seismic issues. The memo also solicits input from interested parties regarding future work on seismic considerations.
Updated: April 2, 2008