Pipe20STD Steel Pipe — Section Properties
Dimensions
| Property |
Value |
Unit |
| Outer Diameter (OD) |
20 |
508.0 mm |
| Wall Thickness (t) |
0.375 |
9.5 mm |
| Area (A) |
21.6 in² |
139.4 cmÃÂò |
| Weight |
78.7 lb/ft |
117.1 kg/m |
Elastic Section Properties
| Property |
Strong Axis (X-X) |
Weak Axis (Y-Y) |
Unit |
| Moment of Inertia (I) |
1040 |
1040 |
in⁴ |
| Elastic Section Modulus (S) |
104 |
104 |
in³ |
| Plastic Section Modulus (Z) |
135 |
135 |
in³ |
| Radius of Gyration (r) |
6.95 |
6.95 |
in |
Torsional Properties
| Property |
Value |
Unit |
| Torsional Constant (J) |
2090 |
in⁴ |
| Warping Constant (Cw) |
0 |
in⁶ |
Section Profile Summary
This is a standard hot-rolled section profile covered by AISC 360. The tabulated section properties are computed from the nominal dimensions per the governing material standard. With Ix = 1,040 in⁴, the strong-axis flexural stiffness is suitable for preliminary sizing of beams and beam-columns.
Key Design Checks (AISC 360)
| Check |
Formula |
This Section |
| Plastic moment |
Mp = Zx × Fy |
6,750 kip-in |
| Deflection |
Δ = 5wLâÃÂô/(384EIx) |
Use Ix = 1,040 in⁴ |
| Torsion |
St. Venant = GJ/L |
J = 2,090 in⁴ |
| Column buckling |
KL/r âÃÂàFcr |
r_x = 6.95 in |
Design Notes
- Compactness: Verify flange and web slenderness against AISC 360 Table B4.1 classification limits for the governing load case (pure compression, pure flexure, or combined).
- Combined loading: For members under simultaneous axial force and bending, use the interaction equations in AISC 360 Section H. The governing equation depends on the ratio of required to available axial strength.
- Connection limit states: Check bolt bearing, tear-out, block shear, and weld strength at all connections. The governing connection limit state often controls the member size selection.
Verification (AISC 360): All designs using this section must be verified by a licensed Professional Engineer. Before finalizing member selection, check beam-column interaction (P-M), lateral-torsional buckling, serviceability deflections, and all connection limit states. See Engineering Disclaimer.
Related Resources
Design Resources
Educational reference only. Verify all section properties against the current AISC 360 Manual and mill certificates before design. Results are PRELIMINARY — NOT FOR CONSTRUCTION.