All structural members shall be made of weathering steel and have a minimum thickness of material of at least 3/16 of an inch.
Steel material shall be corrosion resistant high-strength low alloy material meeting ASTM A242, A588, A606 or A847 with a minimum corrosion index of 5.8 per ASTM G101. All members of the truss and deck system shall be fabricated from square/rectangular hollow structural sections, wide flange may be used for floor beams. Open ends of posts and floor beams shall be capped.
Wood decking shall be No. 1 grade Southern Yellow Pine. Wood decking shall be treated to a minimum of .40 pounds of preservative per cubic foot of wood. The wood deck shall be designed for a minimum 100 psf local loading condition in addition to the wheel loadings produced by the vehicle load section. Floor planks shall be attached with at least two plated fasteners where planks cross-supporting members.
Field splices shall be bolted with High Strength ASTM A325 bolts: type 3 bolts are required for weathering bridges.
Welding materials shall be in strict accordance with the American Welding Society (AWS) Structural welding code, D1.1. Filler metal will match characteristics of the base material. Welders will be certified in accordance with AWS D1.1. (Bridge Welding Code)
*All welds are to be 100% visually inspected.