Indian Standard Heavy Beam per IS 808 : 1989 — depth 250mm, flange width 250mm, web thickness 8.8mm, flange thickness 9.7mm, weight 46.6 kg/m. Wide-flange section optimised for columns and compression members.
| Property | About X-X Axis | About Y-Y Axis |
|---|---|---|
| Moment of Inertia (I) | 77,364,000 mm⁴ (7736.4 cm⁴) | 25,308,000 mm⁴ (2530.8 cm⁴) |
| Elastic Section Modulus (Z) | 618,900 mm³ (618.9 cm³) | 202,500 mm³ (202.5 cm³) |
| Plastic Section Modulus (Zp) | 695,500 mm³ (695.5 cm³) | 308,700 mm³ (308.7 cm³) |
| Radius of Gyration (r) | 114.1 mm | 65.3 mm |
| Distance to Extreme Fibre (c) | 125.0 mm (d/2) | 125.0 mm (b/2) |
| Shape Factor (Zp/Z) | 1.124 | 1.524 |
| Torsional Constant (It) | 240,500 mm⁴ (24.1 cm⁴) | |
| Warping Constant (Iw) | 362,400,000,000 mm⁶ | |
| Polar Moment (Ip = Ix + Iy) | 102,672,000 mm⁴ (10267.2 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) | 158.1 kN·m | 70.2 kN·m | 1350 kN |
| E 350 | 221.3 kN·m | 98.2 kN·m | 1891 kN |
| E 410 | 259.2 kN·m | 115.1 kN·m | 2215 kN |
| E 450 | 284.5 kN·m | 126.3 kN·m | 2431 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 250 @ 46.6 kg/m |
| Europe (EN) — HE-A | HE 240 A |
| Europe (EN) — HE-B | HE 220 B |
| UK (BS) — UC | 254×254×73 UC |
| USA (ASTM) — W-shape | W10×49 |
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 |