Indian Standard Medium Weight Beam per IS 808 : 1989 — depth 500mm, flange width 180mm, web thickness 10.2mm, flange thickness 17.2mm, weight 86.9 kg/m.
| Property | About X-X Axis | About Y-Y Axis |
|---|---|---|
| Moment of Inertia (I) | 452,180,000 mm⁴ (45218.0 cm⁴) | 13,700,000 mm⁴ (1370.0 cm⁴) |
| Elastic Section Modulus (Z) | 1,808,700 mm³ (1808.7 cm³) | 152,200 mm³ (152.2 cm³) |
| Plastic Section Modulus (Zp) | 2,091,000 mm³ (2091.0 cm³) | 239,600 mm³ (239.6 cm³) |
| Radius of Gyration (r) | 202.1 mm | 35.2 mm |
| Distance to Extreme Fibre (c) | 250.0 mm (d/2) | 90.0 mm (b/2) |
| Shape Factor (Zp/Z) | 1.156 | 1.574 |
| Torsional Constant (It) | 556,000 mm⁴ (55.6 cm⁴) | |
| Warping Constant (Iw) | 752,000,000,000 mm⁶ | |
| Polar Moment (Ip = Ix + Iy) | 465,880,000 mm⁴ (46588.0 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 | 475.2 kN·m | 54.5 kN·m | 2516 kN |
| E 350 | 665.3 kN·m | 76.2 kN·m | 3522 kN |
| E 410 | 779.4 kN·m | 89.3 kN·m | 4126 kN |
| E 450 | 855.4 kN·m | 98.0 kN·m | 4529 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 500 | 500 mm | 86.9 kg/m |
| Europe (EN) | IPE 500 | — | — |
| UK (BS) | 457×191×67 UB | — | — |
| USA (ASTM) | W18×60 | — | — |
| Japan (JIS) | H 500×200 | — | — |
| Germany (DIN) | I 500 | — | — |
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 |