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F.3.4.1 Minimum Requirements for Steel Tubing
A tube must meet all four minimum requirements for each Size specified:
Tube | Minimum Area Moment of Inertia | Minimum Cross Sectional Area | Minimum Outside Diameter or Square Width | Minimum Wall Thickness | Example Sizes of Round Tube |
a. Size A | 11320 mm4 | 173 mm2 | 25.0 mm | 2.0 mm | 1.0” x 0.095” 25 x 2.5 mm |
b. Size B | 8509 mm4 | 114 mm2 | 25.0 mm | 1.2 mm | 1.0” x 0.065” 25.4 x 1.6 mm |
c. Size C | 6695 mm4 | 91 mm2 | 25.0 mm | 1.2 mm | 1.0” x 0.049” 25.4 x 1.2 mm |
d. Size D | 18015 mm4 | 126 mm2 | 35.0 mm | 1.2 mm | 1.375” x 0.049” 35 x 1.2 mm |
A tube which is both the Minimum Diameter and the Minimum Wall Thickness may NOT meet the Moment of Inertia and Cross Sectional Area Requirements
F.3.4.2 Properties for ANY steel material for calculations submitted in an SES must be:
a. Non Welded Properties for continuous material calculations:
Young’s Modulus (E) = 200 GPa (29,000 ksi) Yield Strength (Sy) = 305 MPa (44.2 ksi) Ultimate Strength (Su) = 365 MPa (52.9 ksi)
b. Welded Properties for discontinuous material such as joint calculations: Yield Strength (Sy) = 180 MPa (26 ksi)
Ultimate Strength (Su) = 300 MPa (43.5 ksi)
F.3.4.3 Where welded tubing reinforcements are required (such as inserts for bolt holes or material to support suspension cutouts), the tubing must retain the Non Welded Properties while using the Welded Properties for the additional reinforcement material.