StructureCalcsISMB 125
Medium-Weight Beam (ISMB) · IS 808 · India
ISMB 125 is an Indian medium-weight beam 125.0 mm deep with a 70.0 mm wide flange, weighing 13.3 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 | 125.0 mm | 4.92 in |
| Flange width, bf | 70.0 mm | 2.76 in |
| Flange thickness, tf | 8.0 mm | 0.315 in |
| Web thickness, tw | 5.0 mm | 0.197 in |
| Mass per metre | 13.3 kg/m | 8.9 lb/ft |
| Area, A | 1,700 mm² | 2.64 in² |
| Second moment, Ix | 4,450,000 mm⁴ | 10.7 in⁴ |
| Second moment, Iy | 385,000 mm⁴ | 0.9 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 125 the computed area agrees with the published value to 0.02% and Ix to 0.14%. Where a value is also published, the published one above is the one to quote.
| Property | Value |
|---|---|
| Elastic modulus, Zex | 71,298 mm³ |
| Elastic modulus, Zey | 11,393 mm³ |
| Plastic modulus, Zpx | 82,022 mm³ |
| Plastic modulus, Zpy | 18,808 mm³ |
| Radius of gyration, rx | 51.2 mm |
| Radius of gyration, ry | 15.3 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