Lattice Girders, Steel Arches & Props

Butt Joint

• Butt plate height: Rib Depth plus 1"
• Width: Flange width plus 1"
• Thickness:
  4" and 5” sections – 3/8"
  6" sections – 1/2"
  8" sections – 5/8"
  10” sections – 3/4"
  12" sections – 1"
• Bolt size (A325) and quantity:
  4" sections: (2) 3/4" dia
  5" and 6" sections: (2) 1" dia
  8" and 10" sections: (4) 1" dia
  12" sections: (6) 1" dia

The above are for normal loading conditions. For extreme conditions, a full-moment strength joint may be required.