W12X45 Steel Beam — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 12.10 | in (307.3 mm) |
| Flange Width (bf) | 8.05 | in (204.5 mm) |
| Flange Thickness (tf) | 0.57 | in |
| Web Thickness (tw) | 0.34 | in |
| Area (A) | 13.10 | in² (84.5 cm²) |
| Weight | 45 | lb/ft (67 kg/m) |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 348 | 50 | in⁴ |
| Elastic Section Modulus (S) | 57.70 | 12.40 | in³ |
| Plastic Section Modulus (Z) | 64.20 | 19 | in³ |
| Radius of Gyration (r) | 5.15 | 1.95 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 1.26 | in⁴ |
| Warping Constant (Cw) | 1,650 | in⁶ |
| Distance Between Flange Centroids (ho) | 11.50 | in |
| Effective Radius (rts) | 2.23 | in |
Design Resources
- Beam Capacity Calculator — Check W12X45 for your span and loads
- Column Capacity Calculator — Check W12X45 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 W12X45 beam? 45 lb/ft (67 kg/m). A 40-ft length weighs approximately 1,800 lbs.
What is the section modulus of W12X45? Sx = 57.7 in³ (strong axis) and Sy = 12.4 in³ (weak axis). The plastic section modulus Zx = 64.2 in³ and Zy = 19 in³.
What steel grade is standard for W12X45? 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 W12X45? Ix = 348 in⁴ about the strong axis and Iy = 50 in⁴ about the weak axis. The radius of gyration is rx = 5.15 in and ry = 1.95 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.