W33X318 Steel Beam — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 35.20 | in (894.1 mm) |
| Flange Width (bf) | 16 | in (406.4 mm) |
| Flange Thickness (tf) | 1.89 | in |
| Web Thickness (tw) | 1.04 | in |
| Area (A) | 93.70 | in² (604.6 cm²) |
| Weight | 318 | lb/ft (473 kg/m) |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 19,500 | 1,290 | in⁴ |
| Elastic Section Modulus (S) | 1,110 | 161 | in³ |
| Plastic Section Modulus (Z) | 1,270 | 250 | in³ |
| Radius of Gyration (r) | 14.50 | 3.71 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 84.40 | in⁴ |
| Warping Constant (Cw) | 357,000 | in⁶ |
| Distance Between Flange Centroids (ho) | 33.30 | in |
| Effective Radius (rts) | 4.40 | in |
Design Resources
- Beam Capacity Calculator — Check W33X318 for your span and loads
- Column Capacity Calculator — Check W33X318 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 W33X318 beam? 318 lb/ft (473 kg/m). A 40-ft length weighs approximately 12,720 lbs.
What is the section modulus of W33X318? Sx = 1110 in³ (strong axis) and Sy = 161 in³ (weak axis). The plastic section modulus Zx = 1270 in³ and Zy = 250 in³.
What steel grade is standard for W33X318? 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 W33X318? Ix = 19500 in⁴ about the strong axis and Iy = 1290 in⁴ about the weak axis. The radius of gyration is rx = 14.50 in and ry = 3.71 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.