StructureCalcs100 TFB
Taper Flange Beam · AS/NZS 3679.1 · Australia / New Zealand
100 TFB is a taper flange beam 100.0 mm deep with a 45.0 mm wide flange, weighing 7.2 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 | 100.0 mm | 3.94 in |
| Flange width, bf | 45.0 mm | 1.77 in |
| Flange thickness, tf | 6.0 mm | 0.236 in |
| Web thickness, tw | 4.0 mm | 0.157 in |
| Mass per metre | 7.2 kg/m | 4.8 lb/ft |
| Area, A | 917 mm² | 1.42 in² |
| Second moment, Ix | 1,460,000 mm⁴ | 3.5 in⁴ |
| Second moment, Iy | 79,500 mm⁴ | 0.2 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 100 TFB the computed area agrees with the published value to 0.04% and Ix to 0.05%. Where a value is also published, the published one above is the one to quote.
| Property | Value |
|---|---|
| Elastic modulus, Zx | 29,185 mm³ |
| Elastic modulus, Zy | 3,531 mm³ |
| Plastic modulus, Sx | 34,091 mm³ |
| Plastic modulus, Sy | 6,004 mm³ |
| Radius of gyration, rx | 39.9 mm |
| Radius of gyration, ry | 9.3 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