W21X111 Steel Beam — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 21.50 | in (546.1 mm) |
| Flange Width (bf) | 12.30 | in (312.4 mm) |
| Flange Thickness (tf) | 0.88 | in |
| Web Thickness (tw) | 0.55 | in |
| Area (A) | 32.60 | in² (210.3 cm²) |
| Weight | 111 | lb/ft (165 kg/m) |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 2,670 | 274 | in⁴ |
| Elastic Section Modulus (S) | 249 | 44.50 | in³ |
| Plastic Section Modulus (Z) | 279 | 68.20 | in³ |
| Radius of Gyration (r) | 9.05 | 2.90 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 6.83 | in⁴ |
| Warping Constant (Cw) | 29,200 | in⁶ |
| Distance Between Flange Centroids (ho) | 20.60 | in |
| Effective Radius (rts) | 3.37 | in |
Design Resources
- Beam Capacity Calculator — Check W21X111 for your span and loads
- Column Capacity Calculator — Check W21X111 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 W21X111 beam? 111 lb/ft (165 kg/m). A 40-ft length weighs approximately 4,440 lbs.
What is the section modulus of W21X111? Sx = 249 in³ (strong axis) and Sy = 44.5 in³ (weak axis). The plastic section modulus Zx = 279 in³ and Zy = 68.2 in³.
What steel grade is standard for W21X111? 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 W21X111? Ix = 2670 in⁴ about the strong axis and Iy = 274 in⁴ about the weak axis. The radius of gyration is rx = 9.05 in and ry = 2.90 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.