AISC 360-22ASTM A992 / A6W18 Series
AISC W18x71 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 | 71 lb/ft | 105.7 kg/m |
| Cross-Sectional Area | A | 20.9 in² | 13484 mm² |
| Overall Depth | d | 18.5 in | 469.9 mm |
| Flange Width | bf | 7.64 in | 194.1 mm |
| Flange Thickness | tf | 0.81 in | 20.6 mm |
| Web Thickness | tw | 0.495 in | 12.6 mm |
| Flange Centroid Distance | ho | 17.7 in | 449.6 mm |
Bending & Buckling Properties
| Property | Symbol | Imperial (US) | Metric (SI) |
|---|---|---|---|
| Strong-Axis Inertia | Ix | 1170 in⁴ | 487 ×10⁶ mm⁴ |
| Strong-Axis Elastic Modulus | Sx | 127 in³ | 2081 ×10³ mm³ |
| Strong-Axis Plastic Modulus | Zx | 146 in³ | 2393 ×10³ mm³ |
| Strong-Axis Radius of Gyration | rx | 7.5 in | 190.5 mm |
| Weak-Axis Inertia | Iy | 60.3 in⁴ | 25.1 ×10⁶ mm⁴ |
| Weak-Axis Elastic Modulus | Sy | 15.8 in³ | 259 ×10³ mm³ |
| Weak-Axis Plastic Modulus | Zy | 24.7 in³ | 405 ×10³ mm³ |
| Weak-Axis Radius of Gyration | ry | 1.7 in | 43.2 mm |
| Torsional Constant | J | 3.49 in⁴ | 1453 ×10³ mm⁴ |
| Warping Constant | Cw | 7397.5 in⁶ | 1262.1 ×10⁹ mm⁶ |
| Effective Radius of Gyration | rts | 2.05 in | 52.1 mm |
AISC 360-22 Design Capacities (Fy = 50 ksi / 345 MPa)
Plastic Moment Capacity (φMp)
547.5 kip-ft
742.9 kN·m (φ = 0.90)Nominal Shear Capacity (φVn)
247.3 kips
1100.7 kN (φ = 0.90)Flange Slenderness (λf = bf / 2tf)
4.72
✓ Compact Flange (λf ≤ 9.15)Web Slenderness (λw = h / tw)
34.1
✓ Compact Web (λw ≤ 90.5)