Indian Standard Heavy Beam per IS 808 : 1989 — depth 350mm, flange width 250mm, web thickness 8.3mm, flange thickness 11.6mm, weight 61.6 kg/m. Wide-flange section optimised for columns and compression members.
| Property | About X-X Axis | About Y-Y Axis |
|---|---|---|
| Moment of Inertia (I) | 174,637,000 mm⁴ (17463.7 cm⁴) | 30,454,000 mm⁴ (3045.4 cm⁴) |
| Elastic Section Modulus (Z) | 998,000 mm³ (998.0 cm³) | 243,600 mm³ (243.6 cm³) |
| Plastic Section Modulus (Zp) | 1,131,600 mm³ (1131.6 cm³) | 371,600 mm³ (371.6 cm³) |
| Radius of Gyration (r) | 149.2 mm | 62.3 mm |
| Distance to Extreme Fibre (c) | 175.0 mm (d/2) | 125.0 mm (b/2) |
| Shape Factor (Zp/Z) | 1.134 | 1.525 |
| Torsional Constant (It) | 403,400 mm⁴ (40.3 cm⁴) | |
| Warping Constant (Iw) | 855,700,000,000 mm⁶ | |
| Polar Moment (Ip = Ix + Iy) | 205,091,000 mm⁴ (20509.1 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) | 257.2 kN·m | 84.5 kN·m | 1783 kN |
| E 350 | 360.1 kN·m | 118.2 kN·m | 2496 kN |
| E 410 | 421.8 kN·m | 138.5 kN·m | 2924 kN |
| E 450 | 462.9 kN·m | 152.0 kN·m | 3210 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 350 @ 61.6 kg/m |
| Europe (EN) — HE-A | HE 320 A |
| Europe (EN) — HE-B | HE 300 B |
| UK (BS) — UC | 356×368×129 UC |
| USA (ASTM) — W-shape | W14×82 |
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 |