I-beam — 284.13 kg per metre, 361.95 cm² cross-sectional area. IS 808 Table 4 - Wide Parallel Flange Beams.
Wide Parallel Flange Beams (WPB). Reproduced as printed in IS 808 Table 4 - Wide Parallel Flange Beams.
A radius of gyration here disagrees with this row’s own I and A
As printed in IS 808 Table 4 - Wide Parallel Flange Beams. 280 mm deep, 280 mm wide. Units are shown on every row, because the two standards on this site use different ones for the radius of gyration.
| Depth of section D | 280 | mm |
|---|---|---|
| Width of flange B | 280 | mm |
| Thickness of web t | 10.5 | mm |
| Thickness of flange T | 18 | mm |
| Flange slope | 90 | ° |
| Root radius R1 | 24 | mm |
| Toe radius R2 | 0 | mm |
| Mass per metre M | 284.13 | kg/m |
|---|---|---|
| Sectional area A | 361.95 | cm² |
| Second moment of area Izz | 30,682.9 | cm⁴ |
|---|---|---|
| Radius of gyration rzz | 9.21 | mm |
| Elastic section modulus Zzz | 2,191.6 | cm³ |
| Plastic section modulus Zpz | 2,941.1 | cm³ |
| Second moment of area Iyy | 9,105.2 | cm⁴ |
|---|---|---|
| Elastic section modulus Zyy | 650.4 | cm³ |
| Plastic section modulus Zpy | 1,406.8 | cm³ |
| Torsion constant (St Venant) It | 146 | cm⁴ |
|---|---|---|
| Warping constant Iw | 11,30,000 | cm⁶ |
Total weight is the mass per metre multiplied by the length and the number of pieces. Ten pieces of WPB 280 × 280 at six metres each is 284.13 × 6 × 10 = 17,048 kg. There is nothing else to it — the standard publishes the mass, so no one needs to compute it from the area.
You can check that mass against the area on this page: 361.95 cm² of steel at 7 850 kg/m³ is 284.13 kg/m. Every row in this dataset was checked that way, which is how the contradictions flagged on some of these pages were found.
Work it out for your own lengths and quantities →
IS 808 : 2021 gives WPB 280 × 280 a mass of 284.13 kg per metre. Its printed cross-sectional area of 361.95 cm² agrees: 361.95 cm² of steel at 7 850 kg/m³ works out at 284.13 kg per metre.
1704.78 kg. Mass per metre times length: 284.13 × 6. Ten such pieces come to 17048 kg.
280 mm deep and 280 mm wide, with a 10.5 mm web and 18 mm flanges.
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Log in to QuickBOQ →Where these figures come from. IS 808 Table 4 - Wide Parallel Flange Beams Section properties are facts published in the standards, and they are reproduced here as printed. Where a standard contradicts itself, both of its figures are shown and neither is corrected.
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