AISC 360-22ASTM A992 / A6W18 Series
AISC W18x311 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 | 311 lb/ft | 462.8 kg/m |
| Cross-Sectional Area | A | 91.6 in² | 59097 mm² |
| Overall Depth | d | 22.3 in | 566.4 mm |
| Flange Width | bf | 12 in | 304.8 mm |
| Flange Thickness | tf | 2.74 in | 69.6 mm |
| Web Thickness | tw | 1.52 in | 38.6 mm |
| Flange Centroid Distance | ho | 19.6 in | 497.8 mm |
Bending & Buckling Properties
| Property | Symbol | Imperial (US) | Metric (SI) |
|---|---|---|---|
| Strong-Axis Inertia | Ix | 6970 in⁴ | 2901.1 ×10⁶ mm⁴ |
| Strong-Axis Elastic Modulus | Sx | 624 in³ | 10226 ×10³ mm³ |
| Strong-Axis Plastic Modulus | Zx | 754 in³ | 12356 ×10³ mm³ |
| Strong-Axis Radius of Gyration | rx | 8.72 in | 221.5 mm |
| Weak-Axis Inertia | Iy | 795 in⁴ | 330.9 ×10⁶ mm⁴ |
| Weak-Axis Elastic Modulus | Sy | 132 in³ | 2163 ×10³ mm³ |
| Weak-Axis Plastic Modulus | Zy | 207 in³ | 3392 ×10³ mm³ |
| Weak-Axis Radius of Gyration | ry | 2.95 in | 74.9 mm |
| Torsional Constant | J | 176 in⁴ | 73257 ×10³ mm⁴ |
| Warping Constant | Cw | 119934.1 in⁶ | 20462.4 ×10⁹ mm⁶ |
| Effective Radius of Gyration | rts | 3.53 in | 89.7 mm |
AISC 360-22 Design Capacities (Fy = 50 ksi / 345 MPa)
Plastic Moment Capacity (φMp)
2827.5 kip-ft
3836.5 kN·m (φ = 0.90)Nominal Shear Capacity (φVn)
915.2 kips
4074.1 kN (φ = 0.90)Flange Slenderness (λf = bf / 2tf)
2.19
✓ Compact Flange (λf ≤ 9.15)Web Slenderness (λw = h / tw)
11.1
✓ Compact Web (λw ≤ 90.5)