AISC 360-22ASTM A992 / A6W18 Series
AISC W18x50 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 | 50 lb/ft | 74.4 kg/m |
| Cross-Sectional Area | A | 14.7 in² | 9484 mm² |
| Overall Depth | d | 18 in | 457.2 mm |
| Flange Width | bf | 7.5 in | 190.5 mm |
| Flange Thickness | tf | 0.57 in | 14.5 mm |
| Web Thickness | tw | 0.355 in | 9 mm |
| Flange Centroid Distance | ho | 17.4 in | 442 mm |
Bending & Buckling Properties
| Property | Symbol | Imperial (US) | Metric (SI) |
|---|---|---|---|
| Strong-Axis Inertia | Ix | 800 in⁴ | 333 ×10⁶ mm⁴ |
| Strong-Axis Elastic Modulus | Sx | 88.9 in³ | 1457 ×10³ mm³ |
| Strong-Axis Plastic Modulus | Zx | 101 in³ | 1655 ×10³ mm³ |
| Strong-Axis Radius of Gyration | rx | 7.38 in | 187.5 mm |
| Weak-Axis Inertia | Iy | 40.1 in⁴ | 16.7 ×10⁶ mm⁴ |
| Weak-Axis Elastic Modulus | Sy | 10.7 in³ | 175 ×10³ mm³ |
| Weak-Axis Plastic Modulus | Zy | 16.6 in³ | 272 ×10³ mm³ |
| Weak-Axis Radius of Gyration | ry | 1.65 in | 41.9 mm |
| Torsional Constant | J | 1.24 in⁴ | 516 ×10³ mm⁴ |
| Warping Constant | Cw | 4784.8 in⁶ | 816.3 ×10⁹ mm⁶ |
| Effective Radius of Gyration | rts | 1.98 in | 50.3 mm |
AISC 360-22 Design Capacities (Fy = 50 ksi / 345 MPa)
Plastic Moment Capacity (φMp)
378.8 kip-ft
513.9 kN·m (φ = 0.90)Nominal Shear Capacity (φVn)
172.5 kips
768 kN (φ = 0.90)Flange Slenderness (λf = bf / 2tf)
6.58
✓ Compact Flange (λf ≤ 9.15)Web Slenderness (λw = h / tw)
47.5
✓ Compact Web (λw ≤ 90.5)