CFS Version 7 Changes Released December 2011

CFS now supports the 2010 Supplement to the 2007 Edition of the "North American Specification for the Design of Cold-Formed Steel Members". This includes ASD and LRFD for U.S. and Mexico, as well as LSD for Canada. CFS continues to support the 2007, 2004, 2001, and 1999 Editions. Changes from 2007 to 2010 are as follows:

• Section B2.5: Elements restrained by intermittent connections. This section is not utilized by CFS.
• Section B5.1.1: Eq. B5.1.1-1 changed, but CFS uses the more general case in Section B5.1.2.
• Section C2: Tension provisions unified into main body of specification. The equation numbers changed.
• Section C3.1.1: f=0.90 for LRFD, regardless of flange stiffening.
• Section C3.1.4: Distortional buckling simplified provisions were moved to commentary. The equation numbers changed.
• Section C4.2: Distortional buckling simplified provisions were moved to commentary. The equation numbers changed.
• Terminology clarified in Sections D1.1, D1.2, D3, D3.2. No changes to CFS.
• Appendix 1: Limits for pre-qualified sections were expanded. This is specified by the user in CFS.

• New feature to import section geometry from a DXF file
• New feature for measuring distance between any two points on the section
• Updated the SSMA section library to include several new shapes and changes to hole sizes
• Added 2008 AISI Design Manual examples to AISI section library
• Added load combinations for the latest IBC and ASCE-7
• Added materials: A529-55, A572-55, A653-SS50, A653-SS55, A653-HSLAS40, A653-HSLAS55, A792-50/4
• Web crippling inputs were improved to let you choose concentrated or distributed opposing load, and permits P=0
• Implemented the provisions for Section B2.1(b) Procedure II: improved effective width for serviceability determination
• Added feature to the elastic buckling curves to copy the profile data to another application
• Added input for distance between discrete distortional buckling restraints (Lm)
• Added print date to the heading of printouts

• In Section C3.1.4 the distortional buckling moment resistance for LSD uses f=0.85.
• For built-up sections, use the adjusted KL/r only if there is shear transfer between parts.
• The distortional buckling calculations in the main specification may use an increased Fy for cold-work of forming.
• The dimensions ho and bo have been corrected to outside dimensions instead of centerline dimensions.