W18X40
Wide-Flange Beam · AISC Shapes Database v15.0 · United States
W18X40 is a wide-flange beam 454.7 mm deep with a 152.9 mm flange, weighing 59.5 kg/m. The dimensions below are the published AISC Shapes Database v15.0 values; the drawing is generated from them.
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Published dimensions
| Property | Metric | Imperial |
|---|---|---|
| Depth, d | 454.7 mm | 17.90 in |
| Flange width, bf | 152.9 mm | 6.02 in |
| Flange thickness, tf | 13.3 mm | 0.525 in |
| Web thickness, tw | 8.0 mm | 0.315 in |
| Mass per metre | 59.5 kg/m | 40.0 lb/ft |
| Area, A | 7,613 mm² | 11.80 in² |
| Second moment, Ix | 254,733,633 mm⁴ | 612.0 in⁴ |
| Second moment, Iy | 7,950,020 mm⁴ | 19.1 in⁴ |
Derived section properties
Integrated from the section's own outline including the root and toe radii, whose arcs are integrated analytically rather than approximated by facets. For W18X40 the computed area agrees with the published value to 0.01% and Ix to 0.43%. Where a value is also published, the published one above is the one to quote.
| Property | Value |
|---|---|
| Elastic modulus, Zx | 1,125,318 mm³ |
| Elastic modulus, Zy | 104,200 mm³ |
| Plastic modulus, Sx | 1,289,516 mm³ |
| Plastic modulus, Sy | 163,416 mm³ |
| Radius of gyration, rx | 183.3 mm |
| Radius of gyration, ry | 32.4 mm |
Z is the elastic modulus and S the plastic modulus, following AS 4100. Under AISC 360 the letters are reversed — S is elastic and Z is plastic.
Neighbouring sizes
Where these numbers come from
Published AISC Shapes Database v15.0 values. How StructureCalcs verifies its numbers · Understanding steel section properties · Query this section over the API