AISC 360-22ASTM A992 / A6W21 Series
AISC W21x57 Properties & Dimensions
Standard wide flange I-beam cross-section properties, geometric dimensions, and LRFD design capacities per AISC Steel Construction Manual 15th/16th Edition.
Cross-Section Technical Schematic
Dual Units: Imperial (US) · SI MetricGeometric Dimensions & Area
| Property | Symbol | Imperial (US) | Metric (SI) |
|---|---|---|---|
| Nominal Weight | w | 57 lb/ft | 84.8 kg/m |
| Cross-Sectional Area | A | 16.7 in² | 10774 mm² |
| Overall Depth | d | 21.1 in | 535.9 mm |
| Flange Width | bf | 6.56 in | 166.6 mm |
| Flange Thickness | tf | 0.65 in | 16.5 mm |
| Web Thickness | tw | 0.405 in | 10.3 mm |
| Flange Centroid Distance | ho | 20.5 in | 520.7 mm |
Bending & Buckling Properties
| Property | Symbol | Imperial (US) | Metric (SI) |
|---|---|---|---|
| Strong-Axis Inertia | Ix | 1170 in⁴ | 487 ×10⁶ mm⁴ |
| Strong-Axis Elastic Modulus | Sx | 111 in³ | 1819 ×10³ mm³ |
| Strong-Axis Plastic Modulus | Zx | 129 in³ | 2114 ×10³ mm³ |
| Strong-Axis Radius of Gyration | rx | 8.36 in | 212.3 mm |
| Weak-Axis Inertia | Iy | 30.6 in⁴ | 12.7 ×10⁶ mm⁴ |
| Weak-Axis Elastic Modulus | Sy | 9.4 in³ | 153 ×10³ mm³ |
| Weak-Axis Plastic Modulus | Zy | 14.8 in³ | 243 ×10³ mm³ |
| Weak-Axis Radius of Gyration | ry | 1.35 in | 34.3 mm |
| Torsional Constant | J | 1.77 in⁴ | 737 ×10³ mm⁴ |
| Warping Constant | Cw | 5020.9 in⁶ | 856.6 ×10⁹ mm⁶ |
| Effective Radius of Gyration | rts | 1.68 in | 42.7 mm |
AISC 360-22 Design Capacities (Fy = 50 ksi / 345 MPa)
Plastic Moment Capacity (φMp)
483.8 kip-ft
656.4 kN·m (φ = 0.90)Nominal Shear Capacity (φVn)
230.7 kips
1027.1 kN (φ = 0.90)Flange Slenderness (λf = bf / 2tf)
5.05
✓ Compact Flange (λf ≤ 9.15)Web Slenderness (λw = h / tw)
48.9
✓ Compact Web (λw ≤ 90.5)