ANSI/TPI 1-2014 is the National Design Standard for Metal Plate Connected Wood Truss Construction. It is referenced in the 2009 IBC, 2012 IBC, and 2015 IBC.
This standard states that all connections which induce a tension perpendicular to grain stress shall be designed to resist cross grain tension forces. Although the ANSI/TPI 1-2014 standard does not affect the carrying capacity of hangers, the cross grain tension of the lumber may be limiting. The controlling factors that affect the calculated capacity of the hanger is the distance from the end of the supporting member, wood species, effective cross-sectional area of the wood and the location of the upper most fastener in the hanger (HE). Face Mount Hanger capacities may be affected by these standards. ANSI/TPI 1-2014 contains plating methods for satisfying this requirement. To avoid reduction of capacity, please consult with truss fabricator or contact MiTek USA.
USP Structural Connectors developed spreadsheets listing allowable loads for face mount hangers attached to one and two ply girder trusses with bottom chords of Douglas-Fir Larch, Southern Pine, Spruce-Pine-Fir, and Hem Fir wood. Each table is sorted by supported member size and various specialty hangers like hip/jack and 45° skewed hangers.
ANSI/TPI 1-2014 Allowable Loads for:
Hangers unaffected by ANSI/TPI 1-2014:
- Hangers with limited capacities (800 pounds or less at mid-section, 400 pounds or less when located within a distance of 5 x bottom chord depth from the end).
- All top flange hangers such as the JPF, JDS, and HDO hangers are not affected.
- The MSH adjustable strap hanger is not affected when installed in a top-min or top-max application (flanges are formed over the top or back of the chord).
- Bolted hangers are not affected when attached to a vertical web.
- Connectors attached to a solid sawn lumber header, composite lumber such as LVL, PSL, or LSL, and glulam beams are not affected.
- Miscellaneous connectors such as straps, angles, supplemental bearing plates, twist straps, and hurricane/seismic anchors are not affected.
- Any hanger where (HE) is at least 85% of supporting member depth.
- ANSI/TPI 1-2014 also contains plating methods for satisfying this requirement.