AISC 360-22ASTM A992 / A6W8 Series
AISC W8x40 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 | 40 lb/ft | 59.5 kg/m |
| Cross-Sectional Area | A | 11.7 in² | 7548 mm² |
| Overall Depth | d | 8.25 in | 209.6 mm |
| Flange Width | bf | 8.07 in | 205 mm |
| Flange Thickness | tf | 0.56 in | 14.2 mm |
| Web Thickness | tw | 0.36 in | 9.1 mm |
| Flange Centroid Distance | ho | 7.69 in | 195.3 mm |
Bending & Buckling Properties
| Property | Symbol | Imperial (US) | Metric (SI) |
|---|---|---|---|
| Strong-Axis Inertia | Ix | 146 in⁴ | 60.8 ×10⁶ mm⁴ |
| Strong-Axis Elastic Modulus | Sx | 35.5 in³ | 582 ×10³ mm³ |
| Strong-Axis Plastic Modulus | Zx | 39.8 in³ | 652 ×10³ mm³ |
| Strong-Axis Radius of Gyration | rx | 3.53 in | 89.7 mm |
| Weak-Axis Inertia | Iy | 49.1 in⁴ | 20.4 ×10⁶ mm⁴ |
| Weak-Axis Elastic Modulus | Sy | 12.2 in³ | 200 ×10³ mm³ |
| Weak-Axis Plastic Modulus | Zy | 18.5 in³ | 303 ×10³ mm³ |
| Weak-Axis Radius of Gyration | ry | 2.04 in | 51.8 mm |
| Torsional Constant | J | 1.12 in⁴ | 466 ×10³ mm⁴ |
| Warping Constant | Cw | 1142.7 in⁶ | 195 ×10⁹ mm⁶ |
| Effective Radius of Gyration | rts | 2.31 in | 58.7 mm |
AISC 360-22 Design Capacities (Fy = 50 ksi / 345 MPa)
Plastic Moment Capacity (φMp)
149.3 kip-ft
202.5 kN·m (φ = 0.90)Nominal Shear Capacity (φVn)
80.2 kips
357 kN (φ = 0.90)Flange Slenderness (λf = bf / 2tf)
7.21
✓ Compact Flange (λf ≤ 9.15)Web Slenderness (λw = h / tw)
19.8
✓ Compact Web (λw ≤ 90.5)