| hexagonal and octagonal steel cross-section dimensions, the theoretical weight and allowable deviation of | edge distance S (Mm) | tolerances (mm) | cross-section area A (cm 2 ) | Theoretical Weight (kg / m) | 1 | 2 | 3 | six angles | octagonal steel | six angles | octagonal steel | 8 | ± 0.25 | ± 0.35 | ± 0.40 | 0.544 | - | 0.435 | - | 9 | 0.701 | - | 0.551 | - | 10 | 0.866 | - | 0.680 | - | 11 | 1.048 | - | 0.823 | - | 12 | 1.247 | - | 0.979 | - | 13 | 1.464 | - | 1.15 | - | 14 | 1.697 | - | 1.33 | - | 15 | 1.949 | - | 1.53 | - | 16 | 2.217 | 2.120 | 1.74 | 1.66 | 17 | 2.503 | - | 1.96 | - | 18 | 2.808 | 2.683 | 2.20 | 2.16 | 19 | 3.126 | - | 2.45 | - | 20 | 3.464 | 3.312 | 2.72 | 2.60 | 21 | ± 0.30 | ± 0.40 | ± 0.50 | 3.819 | - | 3.00 | - | 22 | 4.192 | 4.088 | 3.29 | 3.15 | 23 | 4.581 | - | 3.60 | - | 24 | 4.988 | - | 3.92 | - | 25 | 5.413 | 5.175 | 4.25 | 4.06 | 26 | 5.854 | - | 4.60 | - | 27 | 6.314 | - | 4.96 | - | 28 | 6.790 | 6.492 | 5.33 | 5.10 | 30 | 7.794 | 7.452 | 6.12 | 5.85 | 32 | ± 0.40 | ± 0.50 | ± 0.60 | 8.868 | 8.479 | 6.96 | 6.66 | 34 | 10.011 | 9.572 | 7.86 | 7.51 | 36 | 11.223 | 10.731 | 8.81 | 8.42 | 38 | 12.505 | 11.956 | 9.82 | 9.39 | 40 | 13.86 | 13.25 | 10.88 | 10.40 | 42 | 15.28 | - | 11.99 | - | 45 | 17.54 | - | 13.77 | - | 48 | 19.95 | - | 15.66 | - | 50 | 21.65 | - | 17.00 | - | 53 | ± 0.60 | ± 0.70 | ± 0.80 | 24.33 | - | 19.10 | - | 56 | 27.16 | - | 21.32 | - | 58 | 29.13 | - | 22.87 | - | 60 | 31.18 | - | 24.50 | - | 63 | 34.37 | - | 26.98 | - | 65 | 36.59 | - | 28.72 | - | 68 | 40.04 | - | 31.43 | - | 70 | 42.53 | - | 33.30 | - | Note: The table in the theoretical weight density of 7.85g/cm 3 Calculate. Weight calculation formula: six angle W (kg / m) = 0.0068 * S2 octagonal steel W (kg / m) = .0065 * S2, Table cross-sectional area (A) formula: A = 1/4nS2tgф/2 * 1/100 Hexagonal A = 3/2S2tg300 * 1/100 ≈ 0.866S2 * 1/100 The the octagonal A = 2S2tg22030 '* 1/100 ≈ 0.828S2 * 1/100 |