AISC 360-22ASTM A992 / A6W18 Series
AISC W18x258 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 | 258 lb/ft | 383.9 kg/m |
| Cross-Sectional Area | A | 76 in² | 49032 mm² |
| Overall Depth | d | 21.5 in | 546.1 mm |
| Flange Width | bf | 11.8 in | 299.7 mm |
| Flange Thickness | tf | 2.3 in | 58.4 mm |
| Web Thickness | tw | 1.28 in | 32.5 mm |
| Flange Centroid Distance | ho | 19.2 in | 487.7 mm |
Bending & Buckling Properties
| Property | Symbol | Imperial (US) | Metric (SI) |
|---|---|---|---|
| Strong-Axis Inertia | Ix | 5510 in⁴ | 2293.4 ×10⁶ mm⁴ |
| Strong-Axis Elastic Modulus | Sx | 514 in³ | 8423 ×10³ mm³ |
| Strong-Axis Plastic Modulus | Zx | 611 in³ | 10012 ×10³ mm³ |
| Strong-Axis Radius of Gyration | rx | 8.53 in | 216.7 mm |
| Weak-Axis Inertia | Iy | 628 in⁴ | 261.4 ×10⁶ mm⁴ |
| Weak-Axis Elastic Modulus | Sy | 107 in³ | 1753 ×10³ mm³ |
| Weak-Axis Plastic Modulus | Zy | 166 in³ | 2720 ×10³ mm³ |
| Weak-Axis Radius of Gyration | ry | 2.88 in | 73.2 mm |
| Torsional Constant | J | 103 in⁴ | 42872 ×10³ mm⁴ |
| Warping Constant | Cw | 90658.8 in⁶ | 15467.7 ×10⁹ mm⁶ |
| Effective Radius of Gyration | rts | 3.42 in | 86.9 mm |
AISC 360-22 Design Capacities (Fy = 50 ksi / 345 MPa)
Plastic Moment Capacity (φMp)
2291.3 kip-ft
3108.9 kN·m (φ = 0.90)Nominal Shear Capacity (φVn)
743 kips
3307.7 kN (φ = 0.90)Flange Slenderness (λf = bf / 2tf)
2.57
✓ Compact Flange (λf ≤ 9.15)Web Slenderness (λw = h / tw)
13.2
✓ Compact Web (λw ≤ 90.5)