AISC 360-22ASTM A992 / A6W40 Series
AISC W40x278 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 | 278 lb/ft | 413.7 kg/m |
| Cross-Sectional Area | A | 82.3 in² | 53097 mm² |
| Overall Depth | d | 40.2 in | 1021.1 mm |
| Flange Width | bf | 12 in | 304.8 mm |
| Flange Thickness | tf | 1.81 in | 46 mm |
| Web Thickness | tw | 1.03 in | 26.2 mm |
| Flange Centroid Distance | ho | 38.4 in | 975.4 mm |
Bending & Buckling Properties
| Property | Symbol | Imperial (US) | Metric (SI) |
|---|---|---|---|
| Strong-Axis Inertia | Ix | 20500 in⁴ | 8532.7 ×10⁶ mm⁴ |
| Strong-Axis Elastic Modulus | Sx | 1020 in³ | 16715 ×10³ mm³ |
| Strong-Axis Plastic Modulus | Zx | 1190 in³ | 19501 ×10³ mm³ |
| Strong-Axis Radius of Gyration | rx | 15.8 in | 401.3 mm |
| Weak-Axis Inertia | Iy | 521 in⁴ | 216.9 ×10⁶ mm⁴ |
| Weak-Axis Elastic Modulus | Sy | 87.1 in³ | 1427 ×10³ mm³ |
| Weak-Axis Plastic Modulus | Zy | 140 in³ | 2294 ×10³ mm³ |
| Weak-Axis Radius of Gyration | ry | 2.52 in | 64 mm |
| Torsional Constant | J | 65 in⁴ | 27055 ×10³ mm⁴ |
| Warping Constant | Cw | 302196.1 in⁶ | 51558.9 ×10⁹ mm⁶ |
| Effective Radius of Gyration | rts | 3.13 in | 79.5 mm |
AISC 360-22 Design Capacities (Fy = 50 ksi / 345 MPa)
Plastic Moment Capacity (φMp)
4462.5 kip-ft
6054.9 kN·m (φ = 0.90)Nominal Shear Capacity (φVn)
1118 kips
4976.7 kN (φ = 0.90)Flange Slenderness (λf = bf / 2tf)
3.31
✓ Compact Flange (λf ≤ 9.15)Web Slenderness (λw = h / tw)
35.5
✓ Compact Web (λw ≤ 90.5)