PREFACE
The 2008 edition of the Cold-Formed Steel Design Manual consists of six Parts. This information is supplemental to the 2007 edition of the North American Specification for the Design of Cold-Formed Steel Structural Members. Each part in the Design Manual should be used in conjuction with the Specification, Commentary and the other parts, where appropriate.

Part I, Dimensions and Properties contains (a) information regarding the availability and properties of steels referenced in the Specification, (b) tables of section properties, and (c) formulas and examples of calculations of section properties.

Part II, Beam Design contains (a) tables and charts to aid in beam design, and (b) beam design example problems.

Part III, Column Design contains (a) tables to aid in column design, and column design example problems.

Part IV, Connections contains (a) tables to aid in connection design, and (b) connection example problems.

Part V, Supplementary Information contains (a) a table of Specification cross-references to the examples provided in this manual (b) design procedures of specification nature which are not included in the Specification itself, either because they are infrequently used or are regarded as too complex for routine design, and (c) other information intended to assist users of cold-formed steel.

Part VI, Test Standards contains (a) test methods for cold-formed steel, (b) a bibliography of other pertinent test methods, and (c) an example problem.
In addition to updating the Design Manual for conformance with the 2007 edition of the North American Specification, the following improvements or additions have been made:

• A series of brief discussions is provided in Parts I-IV, which summarize the intent of the Specification provisions and provide guideline for users
• Standard studs and tracks produced by members of the Steel Stud Manufacturers Association (SSMA) are included in Parts I and IV.
• Formulas for calculating section properties used in distortional buckling analysis are added, along with distortional buckling tables for C-, Z- and SSMA stud sections.
• Tables for screw shear, pull-out and pull-over are provided specifically for SSMA sections
• A table is added to arc spot welds for the case of shear of a sheet welded to an identical sheet.
• The following new design examples have been added to illustrate new design provisions in the Specification:
  1. Round and rectangular tubular section member design in Parts II and III,
  2. C-section member subjected to combined bending and torsional loading in Part II,
  3. Distortional buckling of C-Section members in Parts II and III,
  4. Sigma-shaped flexural and compression member design by the Direct Strength Method in Parts II and III,
  5. Web crippling strength of beam webs with bearing stiffeners in Part II, and
     1. Frame Design with consideration of second order analysis in Part III.
• The Direct Strength Method is introduced for designing members subject to local, distortional and/or global buckling.
• A table of cross-references between the new and previous Test Standard designations is provided in Part IV.
• Editorial changes have been made to all the test standards. Technical guidance and commentary. The following six standards are included in Part IV:
  1. AISI S900-08, Standard Test Method for Determining the Web Crippling Strength of Cold-Formed Steel Beams
  2. AISI S910-08, Testing Method for Distortional Buckling of Cold-Formed Steel Hat Shaped Compressed Members,
  3. AISI S911-08, Method for Flexural Testing Cold-Formed Steel Hat Shaped Beams
  4. AISI S912-08, Test Procedure for Determining a Strength Value for a Roof Panel-To-Purlin-To-Anchorage Device Connection,
  5. AISI S913-08, Test Standard for Hold-Downs Attached to Cold-Formed Steel Structural, and
  6. AISI S914-08, Test Standard For Joist Connectors Attached to Cold-Formed Steel Structural Framing.