Fabrication

Fabrication of Lattice Girders

1. Lattice girder segments shall be composed of a low alloy steel used for concrete reinforcement and intended for special applications where bending and welding are of importance.

2. Minimum physical properties of steel:

• Tensile strength minimum of 80 ksi
• Yield strength minimum of 70 ksi
• Ultimate elongation minimum of 10%

3. The connection elements shall be constructed of structural steel meeting the minimum properties of ASTM A 36. Bolts and nutes shall meet the requirements of ASTM A 325 unless otherwise noted.

4. Welding process to meet the requirements set forth by AWS for gas metal arc welding (GMAW). All welders must be certified in accordance with AWS D1.1. All welds will run parallel to the retaining bars with a minimum length of 1 inch.