Understanding Structural Steel Beam Shapes
Structural steel beams come in several standardized shapes: W, S, HP, and M. Each is designed for specific loading conditions and applications.
W Shapes (Wide Flange)
Most commonly used structural beams. Parallel flanges, flange width ≈ beam depth.
| Designation | Depth (in) | Flange Width (in) | Weight (lb/ft) | Use |
|---|---|---|---|---|
| W8×10 | 7.89 | 3.94 | 10 | Light beams, lintels |
| W12×26 | 12.22 | 6.49 | 26 | Residential beams |
| W14×43 | 13.66 | 7.99 | 43 | Columns, heavy beams |
| W24×76 | 23.92 | 8.99 | 76 | Bridge girders |
S Shapes (American Standard Beam)
Tapered inner flange surfaces, narrower flanges than W shapes. Used for crane runway beams, monorails, and heavy industrial construction.
HP Shapes (Bearing Piles)
Flange width ≈ depth. Equal web and flange thickness. Designed for driving as foundation piles. Sizes: HP8×36 to HP14×117.
HP Applications
- Deep foundation bearing piles
- Retaining wall soldier piles
- Underpinning existing foundations
M Shapes (Miscellaneous)
Catch-all for sections ≤5 inches deep or non-standard proportions. Used for light lintels, trolley beams, and specialty applications.
Comparison Summary
| Feature | W | S | HP | M |
|---|---|---|---|---|
| Flange Surface | Parallel | Tapered | Parallel | Parallel |
| Primary Use | Beams & columns | Crane runs | Foundation piles | Light/misc |
| Grade | A992 | A36/A992 | A36 | A36/A992 |
| Most Common? | ✅ Yes | ❌ Less common | ✅ For piles | ⚠️ Specialty |
How to Select
- Building beams/columns → W shapes
- Deep foundation piles → HP shapes
- Crane runway beams → S shapes
- Light lintels → M shapes
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