Cold Formed Steel Framing Product Identification and General Information
All Quail Run Building Products have a four part identification code which identifies the size (both depth and flange width), style, and material thickness of each member.
1-Minimum Thickness represents 95% of the design thickness and is the minimum acceptable thickness delivered to the job site based on Section A3.4 of the 1996 AISI Specification.
General Notes for all tables
1. The strength increase due to cold work of forming was incorporated for flexural strength as applicable per AISI A7.2.
2. The moment of inertia for deflection is calculated at a stress which results in an effective section modulus such that the stress times that section modulus is equal to the allowable moment. This follows Procedure 1 of the AISI Specification.
3. The yield stress (33 ksi or 50 ksi) used to calculate the tabulated values are indicated in the tables.
4. When provided, factory punch-outs will be located along the centerline of the webs of the members and will have a minimum center-to-center spacing of 24″. Punch-outs will have a maximum width = half the member depth (d/2) or 2 1/2″, whichever is less, and a maximum length = 4 1/2″. The minimum distance between the end of the member and the near edge of the web punch-out =10″.
5. For those steels that have both 33 and 50 ksi listings, if the design is based upon 50 ksi, the 50 ksi steel needs to be specified by the contractor/purchasers. (i.e., 362S137-54 (50 ksi))
Definitions of Structural Property Symbols
Gross Properties
Ixx: Moment of inertia of the gross section about the X-X axis (strong axis).
Rx: Radius of gyration of the gross section about the X-X axis.
Iyy: Moment of inertia of the gross section about the Y-Y axis (weak axis).
Ry: Radius of gyration of the gross section about the Y-Y axis.
Effective Properties
Ixx: Moment of inertia for deflection calculations based on “Procedure 1 for Deflection
Determination” of the 1996 AISI Specification.
Sxx: Effective section modulus about the X-X axis (strong axis) Stress = Fy.
Ma: Allowable Bending Moment – Based on the effective section modulus and the allowable stress
including the strength increase from cold-work of forming (AISI 7.2) where applicable.
Va: Allowable Shear Load.
Ycg: Maximum distance from the outside of the compression flange to the center of gravity of the
effective section.
Torsional Properties
J: St. Venant Torsional Constant.
Cw: Torsional warping constant.
Xo: Distance from the shear center to the centroid along the principal X-axis.
Ro: Polar radius of gyration about the centroidal principal axis.
β: 1- (Xo/Ro)2
