StructureCalcs356x171x51 UB
Universal Beam · BS 4-1 · United Kingdom
356x171x51 UB is a British universal beam 355.0 mm deep with a 171.5 mm wide flange, weighing 51.0 kg/m. The dimensions below are the published BS 4-1 values; the drawing is generated from them.
British Universal Beams to BS 4-1 are the UK’s standard I-beam — the same designation style as the Australian UB, but a distinct dimension table.
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Published dimensions
| Property | Metric | Imperial |
|---|---|---|
| Depth, d | 355.0 mm | 13.98 in |
| Flange width, bf | 171.5 mm | 6.75 in |
| Flange thickness, tf | 11.5 mm | 0.453 in |
| Web thickness, tw | 7.4 mm | 0.291 in |
| Mass per metre | 51.0 kg/m | 34.3 lb/ft |
| Area, A | 6,490 mm² | 10.06 in² |
| Second moment, Ix | 141,360,000 mm⁴ | 339.6 in⁴ |
| Second moment, Iy | 9,680,000 mm⁴ | 23.3 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 356x171x51 UB the computed area agrees with the published value to 0.01% and Ix to better than 0.01%. Where a value is also published, the published one above is the one to quote.
| Property | Value |
|---|---|
| Elastic modulus, Zx | 796,391 mm³ |
| Elastic modulus, Zy | 112,919 mm³ |
| Plastic modulus, Sx | 896,004 mm³ |
| Plastic modulus, Sy | 174,199 mm³ |
| Radius of gyration, rx | 147.6 mm |
| Radius of gyration, ry | 38.6 mm |
Z is the elastic modulus and S the plastic modulus, following British practice (BS 5950 notation). Under AISC 360 the letters are reversed.
Neighbouring sizes
Where these numbers come from
Published BS 4-1 values. How StructureCalcs verifies its numbers · Understanding steel section properties · Query this section over the API