W 16X100 vs HE 450 A
W 16X100 is an W section from the American AISC Shapes Database; HE 450 A is the closest equivalent in the European (Continental) range. They are close to interchangeable in bending: 3244.6 cm³ against 3220 cm³ of plastic modulus, a difference of 0.8%. HE 450 A is the lighter of the two at 140 kg/m against 148.8 kg/m, a saving of 6.3% on steel weight. Both are about 436 mm deep, so either fits the same construction zone.
| Property | W 16X100 W | HE 450 A HE | Difference |
|---|---|---|---|
| Mass | 148.8 kg/m | 140 kg/m | +6.3% |
| Depth | 431.8 mm | 440 mm | -1.9% |
| Width | 264.2 mm | 300 mm | -11.9% |
| Web thickness | 14.9 mm | 11.5 mm | +29.6% |
| Flange thickness | 25 mm | 21 mm | +19.0% |
| Area | 189.7 cm² | 178 cm² | +6.6% |
| Second moment, major (Iy) | 62,018 cm⁴ | 63,700 cm⁴ | -2.6% |
| Plastic modulus, major (Wpl,y) | 3,244.6 cm³ | 3,220 cm³ | +0.8% |
| Elastic modulus, major (Wel,y) | 2,867.7 cm³ | 2,900 cm³ | -1.1% |
| Second moment, minor (Iz) | 7,742 cm⁴ | 9,460 cm⁴ | -18.2% |
| Plastic modulus, minor (Wpl,z) | 899.65 cm³ | 966 cm³ | -6.9% |
| Radius of gyration, minor (iz) | 6.38 cm | 7.29 cm | -12.5% |
| Torsion constant (It) | 321.7 cm⁴ | 250 cm⁴ | +28.7% |
W 16X100 to AISC Shapes Database v16.0; HE 450 A to EN 10365 · Continental Steel. Difference is expressed relative to HE 450 A.
How to choose between them
On stiffness, HE 450 A has the larger second moment of area: 63,700 cm⁴ against 62,018 cm⁴, a difference of 2.6%. This matters more often than the strength comparison, because on normal floor spans deflection rather than bending capacity sets the beam size - so if the two are close on modulus but apart on inertia, the stiffer one is usually the better answer even when it is not the stronger one.
Measured as bending capacity per kilogram of steel, HE 450 A is the more efficient section: 23.0 against 21.8 cm³ per kg/m, 5.2% better. Over a floor of repeated beams that difference is real tonnage, though it is often outweighed by whichever section the fabricator can actually source.
These come from different catalogues, so treat the swap as a design change rather than a like-for-like substitution. W sections are specified to AISC Shapes Database v16.0 and HE to EN 10365 · Continental Steel; the steel grades, tolerances and available lengths differ, connection details and bolt gauges are set out differently, and the two are rarely both stocked in the same market. Check availability before changing a section on a drawing to save 6.3% weight.
In short, W 16X100 is the stronger section and HE 450 A is the lighter one; where those are the same section, it is the clear choice, and where they are not, decide on whether your design is governed by capacity or by tonnage.