I-beam — 95.12 kg per metre, 121 cm² cross-sectional area. IS 808 Table 1 - Medium & Wide Flange Beams.
Medium & Wide Flange Beams (MB, WB). Reproduced as printed in IS 808 Table 1 - Medium & Wide Flange Beams.
A radius of gyration here disagrees with this row’s own I and A
As printed in IS 808 Table 1 - Medium & Wide Flange Beams. 500 mm deep, 250 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 | 500 | mm |
|---|---|---|
| Width of flange B | 250 | mm |
| Thickness of web t | 9.9 | mm |
| Thickness of flange T | 14.7 | mm |
| Flange slope | 96 | ° |
| Root radius R1 | 15 | mm |
| Toe radius R2 | 7.5 | mm |
| Mass per metre M | 95.12 | kg/m |
|---|---|---|
| Sectional area A | 121 | cm² |
| Second moment of area Izz | 52,200 | cm⁴ |
|---|---|---|
| Radius of gyration rzz | 20.7 | mm |
| Elastic section modulus Zzz | 2,090 | cm³ |
| Plastic section modulus Zpz | 2,350 | cm³ |
| Second moment of area Iyy | 2,980 | cm⁴ |
|---|---|---|
| Radius of gyration ryy | 4.96 | mm |
| Elastic section modulus Zyy | 239 | cm³ |
| Plastic section modulus Zpy | 406 | cm³ |
| Torsion constant (St Venant) It | 94.3 | cm⁴ |
|---|---|---|
| Warping constant Iw | 22,50,000 | cm⁶ |
Total weight is the mass per metre multiplied by the length and the number of pieces. Ten pieces of WB 500 at six metres each is 95.12 × 6 × 10 = 5,707 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: 121 cm² of steel at 7 850 kg/m³ is 94.99 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 WB 500 a mass of 95.12 kg per metre. Its printed cross-sectional area of 121 cm² agrees: 121 cm² of steel at 7 850 kg/m³ works out at 94.99 kg per metre.
570.72 kg. Mass per metre times length: 95.12 × 6. Ten such pieces come to 5707 kg.
It is the same section under the name IS 808 : 2021 gives it — the 2021 revision of IS 808 dropped the "IS" prefix, so a drawing saying ISWB 500 means this section. Check the edition before assuming the figures match, though: this page publishes the current tables, and a great many tables in circulation were copied from the 1989 edition.
500 mm deep and 250 mm wide, with a 9.9 mm web and 14.7 mm flanges.
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Log in to QuickBOQ →Where these figures come from. IS 808 Table 1 - Medium & Wide 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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