W18X65 Steel Beam — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 18.40 | in (467.4 mm) |
| Flange Width (bf) | 7.59 | in (192.8 mm) |
| Flange Thickness (tf) | 0.75 | in |
| Web Thickness (tw) | 0.45 | in |
| Area (A) | 19.10 | in² (123.2 cm²) |
| Weight | 65 | lb/ft (97 kg/m) |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 1,070 | 54.80 | in⁴ |
| Elastic Section Modulus (S) | 117 | 14.40 | in³ |
| Plastic Section Modulus (Z) | 133 | 22.50 | in³ |
| Radius of Gyration (r) | 7.49 | 1.69 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 2.73 | in⁴ |
| Warping Constant (Cw) | 4,240 | in⁶ |
| Distance Between Flange Centroids (ho) | 17.70 | in |
| Effective Radius (rts) | 2.03 | in |
Design Resources
- Beam Capacity Calculator — Check W18X65 for your span and loads
- Column Capacity Calculator — Check W18X65 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 W18X65 beam? 65 lb/ft (97 kg/m). A 40-ft length weighs approximately 2,600 lbs.
What is the section modulus of W18X65? Sx = 117 in³ (strong axis) and Sy = 14.4 in³ (weak axis). The plastic section modulus Zx = 133 in³ and Zy = 22.5 in³.
What steel grade is standard for W18X65? 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 W18X65? Ix = 1070 in⁴ about the strong axis and Iy = 54.8 in⁴ about the weak axis. The radius of gyration is rx = 7.49 in and ry = 1.69 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.