StructureCalcs125 TFB
Taper Flange Beam · AS/NZS 3679.1 · Australia / New Zealand
125 TFB is a taper flange beam 125.0 mm deep with a 65.0 mm wide flange, weighing 13.1 kg/m. The dimensions below are the published AS/NZS 3679.1 values; the drawing is generated from them.
Taper Flange Beams are light I-sections with tapered flanges — a legacy profile still rolled in two sizes for lintels and light framing.
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Published dimensions
| Property | Metric | Imperial |
|---|---|---|
| Depth, d | 125.0 mm | 4.92 in |
| Flange width, bf | 65.0 mm | 2.56 in |
| Flange thickness, tf | 8.5 mm | 0.335 in |
| Web thickness, tw | 5.0 mm | 0.197 in |
| Mass per metre | 13.1 kg/m | 8.8 lb/ft |
| Area, A | 1,670 mm² | 2.59 in² |
| Second moment, Ix | 4,340,000 mm⁴ | 10.4 in⁴ |
| Second moment, Iy | 337,000 mm⁴ | 0.8 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 125 TFB the computed area agrees with the published value to 0.27% and Ix to 0.01%. Where a value is also published, the published one above is the one to quote.
| Property | Value |
|---|---|
| Elastic modulus, Zx | 69,448 mm³ |
| Elastic modulus, Zy | 10,364 mm³ |
| Plastic modulus, Sx | 80,292 mm³ |
| Plastic modulus, Sy | 17,217 mm³ |
| Radius of gyration, rx | 50.9 mm |
| Radius of gyration, ry | 14.2 mm |
Z is the elastic modulus and S the plastic modulus, following AS 4100. Under AISC 360 the letters are reversed.
Neighbouring sizes
Where these numbers come from
Published AS/NZS 3679.1 values. How StructureCalcs verifies its numbers · Understanding steel section properties · Query this section over the API