W30X108 Steel Beam — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 29.80 | in (756.9 mm) |
| Flange Width (bf) | 10.50 | in (266.7 mm) |
| Flange Thickness (tf) | 0.76 | in |
| Web Thickness (tw) | 0.55 | in |
| Area (A) | 31.70 | in² (204.5 cm²) |
| Weight | 108 | lb/ft (161 kg/m) |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 4,470 | 146 | in⁴ |
| Elastic Section Modulus (S) | 299 | 27.90 | in³ |
| Plastic Section Modulus (Z) | 346 | 43.90 | in³ |
| Radius of Gyration (r) | 11.90 | 2.15 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 4.99 | in⁴ |
| Warping Constant (Cw) | 30,900 | in⁶ |
| Distance Between Flange Centroids (ho) | 29 | in |
| Effective Radius (rts) | 2.67 | in |
Design Resources
- Beam Capacity Calculator — Check W30X108 for your span and loads
- Column Capacity Calculator — Check W30X108 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 W30X108 beam? 108 lb/ft (161 kg/m). A 40-ft length weighs approximately 4,320 lbs.
What is the section modulus of W30X108? Sx = 299 in³ (strong axis) and Sy = 27.9 in³ (weak axis). The plastic section modulus Zx = 346 in³ and Zy = 43.9 in³.
What steel grade is standard for W30X108? 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 W30X108? Ix = 4470 in⁴ about the strong axis and Iy = 146 in⁴ about the weak axis. The radius of gyration is rx = 11.90 in and ry = 2.15 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.