W8X18
Wide-Flange Beam · AISC Shapes Database v15.0 · United States
W8X18 is a wide-flange beam 206.8 mm deep with a 133.4 mm flange, weighing 26.8 kg/m. The dimensions below are the published AISC Shapes Database v15.0 values; the drawing is generated from them.
Analyse this section, or combine it with plates and other shapes.
Open W8X18 in the Section CalculatorFree, no sign-up, runs in your browser.
Published dimensions
| Property | Metric | Imperial |
|---|---|---|
| Depth, d | 206.8 mm | 8.14 in |
| Flange width, bf | 133.4 mm | 5.25 in |
| Flange thickness, tf | 8.4 mm | 0.330 in |
| Web thickness, tw | 5.8 mm | 0.230 in |
| Mass per metre | 26.8 kg/m | 18.0 lb/ft |
| Area, A | 3,394 mm² | 5.26 in² |
| Second moment, Ix | 25,764,725 mm⁴ | 61.9 in⁴ |
| Second moment, Iy | 3,317,365 mm⁴ | 8.0 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 W8X18 the computed area agrees with the published value to 0.02% and Ix to 0.03%. Where a value is also published, the published one above is the one to quote.
| Property | Value |
|---|---|
| Elastic modulus, Zx | 249,291 mm³ |
| Elastic modulus, Zy | 49,736 mm³ |
| Plastic modulus, Sx | 279,016 mm³ |
| Plastic modulus, Sy | 76,356 mm³ |
| Radius of gyration, rx | 87.1 mm |
| Radius of gyration, ry | 31.3 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