Indian Standard Medium Weight Beam per IS 808 : 1989 — depth 225mm, flange width 110mm, web thickness 6.5mm, flange thickness 11.8mm, weight 31.2 kg/m.
| Property | About X-X Axis | About Y-Y Axis |
|---|---|---|
| Moment of Inertia (I) | 34,420,000 mm⁴ (3442.0 cm⁴) | 2,180,000 mm⁴ (218.0 cm⁴) |
| Elastic Section Modulus (Z) | 306,000 mm³ (306.0 cm³) | 39,600 mm³ (39.6 cm³) |
| Plastic Section Modulus (Zp) | 353,600 mm³ (353.6 cm³) | 62,500 mm³ (62.5 cm³) |
| Radius of Gyration (r) | 93.1 mm | 23.4 mm |
| Distance to Extreme Fibre (c) | 112.5 mm (d/2) | 55.0 mm (b/2) |
| Shape Factor (Zp/Z) | 1.156 | 1.578 |
| Torsional Constant (It) | 163,000 mm⁴ (16.3 cm⁴) | |
| Warping Constant (Iw) | 42,700,000,000 mm⁶ | |
| Polar Moment (Ip = Ix + Iy) | 36,600,000 mm⁴ (3660.0 cm⁴) | |
Useful for paint estimation, fire protection coating quantities, and section analysis:
Surface area calculated from full cross-section perimeter including flange tips. Shear area Av = d × tw per IS 800 : 2007 cl. 8.4. Surface/mass ratio used for estimating paint and fireproofing coverage per kg of steel.
Calculated per IS 800 : 2007 (limit state design) using partial safety factor γm0 = 1.10. Values assume the section is fully laterally restrained. Reduce for unsupported lengths per IS 800 cl. 8.2.
| Grade | Plastic Moment Mp (X-X) | Plastic Moment Mp (Y-Y) | Axial Capacity (Short) |
|---|---|---|---|
| E 250 | 80.4 kN·m | 14.2 kN·m | 902 kN |
| E 350 | 112.5 kN·m | 19.9 kN·m | 1263 kN |
| E 410 | 131.8 kN·m | 23.3 kN·m | 1480 kN |
| E 450 | 144.7 kN·m | 25.6 kN·m | 1624 kN |
Mp = Zp × fy / γm0. Axial capacity = A × fy / γm0 for short, fully-restrained columns. For longer columns, apply slenderness reduction per IS 800 cl. 7.1.2.
| Standard | Equivalent Section | Depth | Weight |
|---|---|---|---|
| India (IS 808) | ISMB 225 | 225 mm | 31.2 kg/m |
| Europe (EN) | IPE 220 | — | — |
| UK (BS) | 203×133×30 UB | — | — |
| USA (ASTM) | W8×24 | — | — |
| Japan (JIS) | H 225×110 | — | — |
| Germany (DIN) | I 220 | — | — |
Equivalence based on closest matching depth and weight. Note that ISMB has tapered flanges (8° slope per IS 808) while IPE, UB, and W-shapes have parallel flanges. Always verify exact properties from the actual standard before substituting in design calculations.
| Grade | Yield (MPa) | UTS (MPa) | Elong. | Application |
|---|---|---|---|---|
| E250 (Fe 410W) | 250 | 410 | 23% | General construction |
| E275 (Fe 440) | 275 | 440 | 22% | Commercial buildings |
| E300 | 300 | 440 | 22% | Industrial structures |
| E350 (Fe 490) | 350 | 490 | 22% | Heavy industrial, bridges |
| E410 (Fe 540) | 410 | 540 | 20% | Heavy structural, offshore |
| E450 (Fe 570) | 450 | 570 | 20% | Bridges, towers |