Section Index. | Depth of Beam. THE Weight per Foot. Width of Flange. Neutral Axis Coin- Moment of Inertia, Neutral Axis Per- Radius of Gyration, Neutral Axis Coincident with Centre Line of Web. Radius of Gyration, tral Axis Perpendic- Section Modulus, Neu for Fibre Stress of Coefficient of Strength 16,000 lbs. per sq. in. : 66 65 19.08 0.50 6.25 1169.6 B77 3 7.5 2.21 0.36 2.52 2.9 0.60 1.15 0.52 1.9 20700 L = PROPERTIES OF ROLLED STRUCTURAL STEEL. Safe Loads, Uniformly Distributed, for Standard and Special I Beams. (The Carnegie Steel Co., Ltd.) In Tons of 2000 Lbs. Distance between Supports in Feet. 18'I. 15" I. 20" I, 65 lbs. 55 lbs. 80 lbs. 60 lbs. 42 lbs. 12" I. 10" I. 9" I. Distance between Supports in Feet. 8" I. 7" I. 6" I. 5" I. 4" I. 3" I. 40 lbs. 31.5 25 lbs. 21 lbs. Special. lbs. 58.00 48.88 38.99 29.47 35.35 27.07 19.63 54.58 46.01 36.69 27.74 33.27 25.47 18.48 51.56 4.45 34.66 26.19 31.42 24.06 17.45 48.84 41,17 32.83 24.82 29.77 22.79 16.53 46.40 39.11 31.19 23.58 28.28 21.65 15.71 44.19 37.24 29.70 22.45 26.94 20.62 14.96 42.18 35.55 28.35 21.43 25.71 19.68 14.28 40.35 34.01 27.12 20.50 24.59 18.83 13.66 38.67 32.59 25.99 19.65 23.57 18.04 13.09 37.12 31.29 24,95 18.86 22.63 17.32 12.57 35.69 30.08 23.99 18.14 21.76 16.66 12.08 34.87 28.97 23.10 17.46 20.95 16.04 11.64 33.14 27.93 22.28 16.84 20.20 15.47 11.22 32.00 26.97 21.51 16,26 19.51 14.93 10.83 30.93 26.07 20.79 15.72 18.86 14.43 0.47 8 9.48 6.90 4.84 3.23 16 14.94 11.99 8.14 6.29 1.99 1.10 9 8.43 6.13 4.31 2.87 1.77 0.98 17 14.06 11.29 7.66 5.92 10 7.59 5.52 3.88 2.58 1.59 0.88 11 6.90 5.02 3.52 2.35 1.45 0.80 20 11.95 9.59 6.51 5.03 12 6.32 4.60 3.23 2.15 1.33 0.73 Safe loads given include weight of beam. Maximum fibre stress 16.000 lbs. per square inch. 275 Spacing of Carnegie I-Beams for Uniform Load of 100 lbs. per Square Foot. STEEL. (Proper distance in feet, centre to centre of beams.) 128.9 108.6 86.6 65.5 109.8 82.5 72.5 51.4 46.4 42.1 78.6 60.1 43.6 33.2 26.6 18.1 5 15.4 13.3 682& 10 20.1 15.2 11.1 7.8 5.2 3.2 1.8 25.5 21.5 17.1 12.9 15.5 11.9 20.6 17.4 13.9 10.5 12.6 9.6 7.0 5.3 4.3 2.9 22 3.8 3.1 2.3 1.6 1.1 .... For any other load than 100 lbs. per square foot, divide the spacing given by the ratio the given load per square foot bears to 100. Thus for a load of 150 lbs. per square foot divide by 1.5. Maximum fibre stress, 16,000 lbs. per square inch. Only figures above the cross-lines should be used for plastered ceilings, so that the deflection will not cause cracking of the plaster. |