StructureCalcsISMB 250
Medium-Weight Beam (ISMB) · IS 808 · India
ISMB 250 is an Indian medium-weight beam 250.0 mm deep with a 125.0 mm wide flange, weighing 37.3 kg/m. The dimensions below are the published IS 808 values; the drawing is generated from them.
ISMB medium-weight beams are the standard Indian I-beam of IS 808, with the tapered flange reproduced in the drawing.
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Published dimensions
| Property | Metric | Imperial |
|---|---|---|
| Depth, d | 250.0 mm | 9.84 in |
| Flange width, bf | 125.0 mm | 4.92 in |
| Flange thickness, tf | 12.5 mm | 0.492 in |
| Web thickness, tw | 6.9 mm | 0.272 in |
| Mass per metre | 37.3 kg/m | 25.1 lb/ft |
| Area, A | 4,750 mm² | 7.36 in² |
| Second moment, Ix | 51,300,000 mm⁴ | 123.2 in⁴ |
| Second moment, Iy | 3,350,000 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 ISMB 250 the computed area agrees with the published value to 0.01% and Ix to 0.07%. Where a value is also published, the published one above is the one to quote.
| Property | Value |
|---|---|
| Elastic modulus, Zex | 410,679 mm³ |
| Elastic modulus, Zey | 55,063 mm³ |
| Plastic modulus, Zpx | 465,528 mm³ |
| Plastic modulus, Zpy | 91,091 mm³ |
| Radius of gyration, rx | 104.0 mm |
| Radius of gyration, ry | 26.9 mm |
Ze is the elastic modulus and Zp the plastic modulus, following IS 800 notation.
Neighbouring sizes
Where these numbers come from
Published IS 808 values. How StructureCalcs verifies its numbers · Understanding steel section properties · Query this section over the API