W12X279 Steel Beam — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 15.90 | in (403.9 mm) |
| Flange Width (bf) | 13.10 | in (332.7 mm) |
| Flange Thickness (tf) | 2.47 | in |
| Web Thickness (tw) | 1.53 | in |
| Area (A) | 81.90 | in² (528.4 cm²) |
| Weight | 279 | lb/ft (415 kg/m) |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 3,110 | 937 | in⁴ |
| Elastic Section Modulus (S) | 393 | 143 | in³ |
| Plastic Section Modulus (Z) | 481 | 220 | in³ |
| Radius of Gyration (r) | 6.16 | 3.38 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 143 | in⁴ |
| Warping Constant (Cw) | 42,000 | in⁶ |
| Distance Between Flange Centroids (ho) | 13.40 | in |
| Effective Radius (rts) | 4 | in |
Design Resources
- Beam Capacity Calculator — Check W12X279 for your span and loads
- Column Capacity Calculator — Check W12X279 as a column
- Section Properties Database — Compare with other sections
- Steel Beam Sizes Reference — Full W-shape dimension table
- Steel Grades Reference — A992/A572 material properties
Frequently Asked Questions
What is the weight of a W12X279 beam? 279 lb/ft (415 kg/m). A 40-ft length weighs approximately 11,160 lbs.
What is the section modulus of W12X279? Sx = 393 in³ (strong axis) and Sy = 143 in³ (weak axis). The plastic section modulus Zx = 481 in³ and Zy = 220 in³.
What steel grade is standard for W12X279? Typically ASTM A992 (Fy = 50 ksi, Fu = 65 ksi) for W-shapes. Also available in A572 Grade 50 or A36. Verify with mill certificate.
What is the moment of inertia of W12X279? Ix = 3110 in⁴ about the strong axis and Iy = 937 in⁴ about the weak axis. The radius of gyration is rx = 6.16 in and ry = 3.38 in.
Related Pages
- Steel Beam Sizes Reference
- Beam Capacity Calculator
- Column Capacity Calculator
- Section Properties Database
Educational reference only. Verify all section properties against the current AISC Manual and mill certificates before design. Results are PRELIMINARY — NOT FOR CONSTRUCTION.