Verify that the repetitive member factor is used properly. Repetitive member design values apply to all truss chord members where three or more trusses are positioned side by side, are in contact, or are spaced no more than 24 in. (610 mm) on center and are joined by roof sheathing, flooring, gypsum, or other load-distributing elements attached directly to the chords.
For solid sawn lumber members to which structural wood sheathing is mechanically attached: Use the repetitive member design value listed in the recognized lumber grading rules, or a 15 percent increase to Fb (Cr=1.15) and 10 percent increase to Fc, Ft, and Emin (Cr=1.1).
For solid sawn lumber members to which structural wood sheathing is not attached: Use the repetitive member design value listed in the recognized lumber grading rules, or a 10% repetitive member design value increase to Fb , Fc, Ft, and Emin (Cr=1.1).
For Structural Composite Lumber: Repetitive member design values are limited to no more than a 4increase to Fb (Cr < 1.04) and no (zero) increase to other allowable design values (Cr =1).
Single-ply and two-ply girder trusses are not permitted to use the repetitive member increases outlined in Section 6.4.2.1 of ANSI/TPI 1 National Design Standard for Metal Plate Connected Wood Truss Construction.
Define repetitive member functionality in EnvData > OneTrussControls > Use repetitive member factors.
If True, Cr for TC member is 1.1
If False, Cr for TC member is 1.15
Cr for BC is always 1.1