W18X311 Steel Beam — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 22.30 | in (566.4 mm) |
| Flange Width (bf) | 12 | in (304.8 mm) |
| Flange Thickness (tf) | 2.74 | in |
| Web Thickness (tw) | 1.52 | in |
| Area (A) | 91.60 | in² (591.0 cm²) |
| Weight | 311 | lb/ft (463 kg/m) |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 6,970 | 795 | in⁴ |
| Elastic Section Modulus (S) | 624 | 132 | in³ |
| Plastic Section Modulus (Z) | 754 | 207 | in³ |
| Radius of Gyration (r) | 8.72 | 2.95 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 176 | in⁴ |
| Warping Constant (Cw) | 76,200 | in⁶ |
| Distance Between Flange Centroids (ho) | 19.60 | in |
| Effective Radius (rts) | 3.53 | in |
Design Resources
- Beam Capacity Calculator — Check W18X311 for your span and loads
- Column Capacity Calculator — Check W18X311 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 W18X311 beam? 311 lb/ft (463 kg/m). A 40-ft length weighs approximately 12,440 lbs.
What is the section modulus of W18X311? Sx = 624 in³ (strong axis) and Sy = 132 in³ (weak axis). The plastic section modulus Zx = 754 in³ and Zy = 207 in³.
What steel grade is standard for W18X311? 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 W18X311? Ix = 6970 in⁴ about the strong axis and Iy = 795 in⁴ about the weak axis. The radius of gyration is rx = 8.72 in and ry = 2.95 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.