Indian Standard Medium Weight Beam per IS 808 : 1989 — depth 400mm, flange width 140mm, web thickness 8.9mm, flange thickness 16.0mm, weight 61.5 kg/m.
| Property | About X-X Axis | About Y-Y Axis |
|---|---|---|
| Moment of Inertia (I) | 204,580,000 mm⁴ (20458.0 cm⁴) | 6,220,000 mm⁴ (622.0 cm⁴) |
| Elastic Section Modulus (Z) | 1,022,900 mm³ (1022.9 cm³) | 88,900 mm³ (88.9 cm³) |
| Plastic Section Modulus (Zp) | 1,192,000 mm³ (1192.0 cm³) | 141,200 mm³ (141.2 cm³) |
| Radius of Gyration (r) | 161.5 mm | 28.2 mm |
| Distance to Extreme Fibre (c) | 200.0 mm (d/2) | 70.0 mm (b/2) |
| Shape Factor (Zp/Z) | 1.165 | 1.588 |
| Torsional Constant (It) | 388,000 mm⁴ (38.8 cm⁴) | |
| Warping Constant (Iw) | 274,000,000,000 mm⁶ | |
| Polar Moment (Ip = Ix + Iy) | 210,800,000 mm⁴ (21080.0 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 | 270.9 kN·m | 32.1 kN·m | 1782 kN |
| E 350 | 379.3 kN·m | 44.9 kN·m | 2495 kN |
| E 410 | 444.3 kN·m | 52.6 kN·m | 2922 kN |
| E 450 | 487.6 kN·m | 57.8 kN·m | 3207 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 400 | 400 mm | 61.5 kg/m |
| Europe (EN) | IPE 400 | — | — |
| UK (BS) | 406×140×46 UB | — | — |
| USA (ASTM) | W16×40 | — | — |
| Japan (JIS) | H 400×150 | — | — |
| Germany (DIN) | I 400 | — | — |
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 |