W8X18 Steel Beam — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 8.14 | in (206.8 mm) |
| Flange Width (bf) | 5.25 | in (133.3 mm) |
| Flange Thickness (tf) | 0.33 | in |
| Web Thickness (tw) | 0.23 | in |
| Area (A) | 5.26 | in² (33.9 cm²) |
| Weight | 18 | lb/ft (27 kg/m) |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 61.90 | 7.97 | in⁴ |
| Elastic Section Modulus (S) | 15.20 | 3.04 | in³ |
| Plastic Section Modulus (Z) | 17 | 4.66 | in³ |
| Radius of Gyration (r) | 3.43 | 1.23 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 0.17 | in⁴ |
| Warping Constant (Cw) | 122 | in⁶ |
| Distance Between Flange Centroids (ho) | 7.81 | in |
| Effective Radius (rts) | 1.43 | in |
Design Resources
- Beam Capacity Calculator — Check W8X18 for your span and loads
- Column Capacity Calculator — Check W8X18 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 W8X18 beam? 18 lb/ft (27 kg/m). A 40-ft length weighs approximately 720 lbs.
What is the section modulus of W8X18? Sx = 15.2 in³ (strong axis) and Sy = 3.0 in³ (weak axis). The plastic section modulus Zx = 17 in³ and Zy = 4.7 in³.
What steel grade is standard for W8X18? 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 W8X18? Ix = 61.9 in⁴ about the strong axis and Iy = 8.0 in⁴ about the weak axis. The radius of gyration is rx = 3.43 in and ry = 1.23 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.