W18X158 Steel Beam — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 19.70 | in (500.4 mm) |
| Flange Width (bf) | 11.30 | in (287.0 mm) |
| Flange Thickness (tf) | 1.44 | in |
| Web Thickness (tw) | 0.81 | in |
| Area (A) | 46.30 | in² (298.7 cm²) |
| Weight | 158 | lb/ft (235 kg/m) |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 3,060 | 347 | in⁴ |
| Elastic Section Modulus (S) | 310 | 61.40 | in³ |
| Plastic Section Modulus (Z) | 356 | 94.80 | in³ |
| Radius of Gyration (r) | 8.12 | 2.74 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 25.20 | in⁴ |
| Warping Constant (Cw) | 29,000 | in⁶ |
| Distance Between Flange Centroids (ho) | 18.30 | in |
| Effective Radius (rts) | 3.20 | in |
Design Resources
- Beam Capacity Calculator — Check W18X158 for your span and loads
- Column Capacity Calculator — Check W18X158 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 W18X158 beam? 158 lb/ft (235 kg/m). A 40-ft length weighs approximately 6,320 lbs.
What is the section modulus of W18X158? Sx = 310 in³ (strong axis) and Sy = 61.4 in³ (weak axis). The plastic section modulus Zx = 356 in³ and Zy = 94.8 in³.
What steel grade is standard for W18X158? 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 W18X158? Ix = 3060 in⁴ about the strong axis and Iy = 347 in⁴ about the weak axis. The radius of gyration is rx = 8.12 in and ry = 2.74 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.