Indian Standard Heavy Beam per IS 808 : 1989 — depth 450mm, flange width 250mm, web thickness 11.3mm, flange thickness 13.7mm, weight 87.2 kg/m. Wide-flange section optimised for columns and compression members.
| Property | About X-X Axis | About Y-Y Axis |
|---|---|---|
| Moment of Inertia (I) | 333,054,000 mm⁴ (33305.4 cm⁴) | 36,107,000 mm⁴ (3610.7 cm⁴) |
| Elastic Section Modulus (Z) | 1,480,200 mm³ (1480.2 cm³) | 288,900 mm³ (288.9 cm³) |
| Plastic Section Modulus (Zp) | 1,690,400 mm³ (1690.4 cm³) | 441,100 mm³ (441.1 cm³) |
| Radius of Gyration (r) | 173.2 mm | 57.0 mm |
| Distance to Extreme Fibre (c) | 225.0 mm (d/2) | 125.0 mm (b/2) |
| Shape Factor (Zp/Z) | 1.142 | 1.527 |
| Torsional Constant (It) | 740,400 mm⁴ (74.0 cm⁴) | |
| Warping Constant (Iw) | 1,748,500,000,000 mm⁶ | |
| Polar Moment (Ip = Ix + Iy) | 369,161,000 mm⁴ (36916.1 cm⁴) | |
Useful for paint estimation, fire protection coating quantities, and section analysis:
Surface area calculated from full cross-section perimeter. 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 (short column / fully restrained beam). Reduce for slenderness and unsupported lengths per IS 800 cl. 7.1.2 and cl. 8.2.
| Grade | Plastic Moment Mp (X-X) | Plastic Moment Mp (Y-Y) | Axial Capacity Pd (Short) |
|---|---|---|---|
| E 250 (Fe 410W) | 384.2 kN·m | 100.2 kN·m | 2524 kN |
| E 350 | 537.9 kN·m | 140.3 kN·m | 3534 kN |
| E 410 | 630.1 kN·m | 164.4 kN·m | 4140 kN |
| E 450 | 691.5 kN·m | 180.4 kN·m | 4543 kN |
Mp = Zp × fy / γm0. Axial capacity Pd = A × fy / γm0 for short, fully-restrained columns. For longer columns, apply slenderness reduction per IS 800 cl. 7.1.2.
| Standard | Equivalent Section |
|---|---|
| India (IS 808) | ISHB 450 H @ 87.2 kg/m |
| Europe (EN) — HE-A | HE 400 A |
| Europe (EN) — HE-B | HE 400 B |
| UK (BS) — UC | 356×406×287 UC |
| USA (ASTM) — W-shape | W18×119 |
Equivalence based on closest matching depth and weight. ISHB has a slightly different flange-to-depth ratio than HE/UC/W-shapes. Always verify exact properties from the actual standard before substituting in design calculations.
| Grade | Yield (MPa) | UTS (MPa) | Elongation | Application |
|---|---|---|---|---|
| E 250 (Fe 410W) | 250 | 410 | 23% | General construction |
| E 350 | 350 | 490 | 22% | Multi-storey buildings |
| E 410 | 410 | 540 | 20% | Heavy columns, high-rise |
| E 450 | 450 | 570 | 20% | Bridges, offshore |