This section is from the book "Building Construction And Superintendence", by F. E. Kidder. Also available from Amazon: Building Construction And Superintendence.
Short posts of cast iron, with a length in inches not exceeding eight times their least dimension, may be safely loaded with six tons for each square inch of metal in the cross section.
The safe load for longer columns should be computed by means of accepted formulas. These formulas vary for different forms of cross section; they may be found in most books of references. The following table gives the safe loads for hollow cylindrical columns with {-inch shell, and caps and bases cast as described in Section
260. Tables for other thicknesses of shell and for square and rectangular columns are given in the Architects' and Builders' Pocket Book.
Thickness of Shell ¾ Inch. | ||||||||
Length column. | Diameter of column (outside). | |||||||
6 ins. | 7 ins. | 8 ins. | 9 ins. | 10 ins. | 11 ins. | 12 ins. | 13 ins. | |
Feet. | Tons. | Tons. | Tons. | Tons. | Tons. | Tons. | Tons. | Tons. |
6 | 60.6 | 78.1 | 94.0 | 110.8 | 128.6 | 144.9 | 161.7 | 180.0 |
7 | 55.7 | 72.2 | 88.9 | 106.9 | 124.2 | 140.1 | 156.4 | 176.0 |
8 | 50.7 | 66.3 | 83.8 | 101.1 | 117.7 | 135.2 | 151.1 | 170.3 |
9 | 45.8 | 61.9 | 78.7 | 95.2 | 113.4 | 130.4 | 1458 | 164.5 |
10 | 40.8 | 56.0 | 73.5 | 89.4 | 106.8 | 123.2 | 140.5 | 158.7 |
11 | 37.1 | 51.5 | 68.4 | 83.6 | 100.1 | 118.3 | 135.2 | 153.0 |
12 | 334 | 47.1 | 63.3 | 79.7 | 95.9 | 113.5 | 129.9 | 147.2 |
13 | 30.9 | 44.2 | 58.1 | 739 | 89.4 | 106.3 | 124.6 | 141.4 |
14 | 27.2 | 39.8 | 547 | 70.0 | 85.0 | 101. 4 | 119.2 | 135.6 |
15 | 24.7 | 36.8 | 496 | 64.1 | 78.5 | 96.6 | 114.0 | 129.9 |
16 | 22.3 | 33.9 | 46.2 | 60.3 | 71.9 | 91.8 | 108.7 | 124.1 |
18 | • •. • | 29.0 | 41.0 | 52.5 | 67.6 | 84.5 | 103.4 | 118.3 |
20 | . •. • | 24.4 | 36.0 | 44.7 | 63.3 | 77.2 | 98.1 | 112.5 |
Metal area of cross-section. | ||||||||
sq. ins. | sq. ins. | sq. ins. | sq. ins. | sq. ins. | sq. ins. | sq. ins. | sq. ins. | |
12.37 | 14.73 | 17.10 | 19.44 | 21.80 | 24.15 | 26.51 | 28.86 |
Safe Load = Metal Area x (11,000 - 35 l/r) | |||||||||||
Nominal Size. | External Dia. | Thickness. | Weight per foot. | Area of Section. | r | Length in Feet. | |||||
8 | 9 | 10 | 12 | 14 | |||||||
ins. | ins. | ins. | lbs. | lbs. | lbs. | lbs. | lbs. | lbs. | |||
Standard Pipe. | 2½ | 2.875 | .204 | 5.74 | 1.59 | .94 | 11,810 | 11,030 | 10,420 | ||
3 | 3.5 | .217 | 7.54 | 2.26 | 1.16 | 18,290 | 17,500 | 16,710 | 15,050 | ||
3½ | 4.0 | .226 | 9.00 | 2.59 | 1.35 | 22,040 | 21,330 | 20,510 | 18,790 | 17,250 | |
4 | 4.5 | .237 | 10.66 | 3.33 | 1.50 | 28,900 | 28,230 | 27,300 | 25,440 | 23,570 | |
4½ | 5.0 | .247 | 12.34 | 3.73 | 1.68 | 33,570 | 32,674 | 31,760 | 29,800 | 27,970 | |
5 | 5.563 | .259 | 14.50 | 4.17 | 1.88 | 37.530 | 37.530 | 36,520 | 34,630 | 32,520 | |
6 | 6.625 | .280 | 18.76 | 5.57 | 2.25 | 50,130 | 50,130 | 50,130 | 48,790 | 46,640 | |
7 | 7.625 | .301 | 23.37 | 7.18 | 2.59 | 64,620 | 64,620 | 64,620 | 64,620 | 62,640 | |
8 | 8.625 | .322 | 28.18 | 8.14 | 2.94 | 73.260 | 73.260 | 73.260 | 73,260 | 73,260 | |
XX Strong. | 2½ | 2.875 | .56 | 13.68 | 4.09 | 0.82 | 28,200 | 26,090 | 23,722 | ||
3 | 3.5 | .608 | 18.56 | 5.52 | 1.02 | 42,500 | 40,240 | 38,080 | 33,120 | ||
3i | 4.0 | .642 | 22.75 | 6.63 | 1.20 | 54.360 | 52,040 | 49,720 | 45,o8o | 39,78o | |
4 | 4.50 | .682 | 27.48 | 8.33 | 1.35 | 70,630 | 68,300 | 65,680 | 60,390 | 55,140 | |
5 | 5.563 | .75 | 38.12 | 11.73 | 1.70 | 105,570 | 102,754 | 99,880 | 94,130 | 88,320 | |
6 | 6.625 | .875 | 53.11 | 15.80 | 2.04 | 142,200 | 142,200 | 141,170 | 133,980 | 128,450 |
 
Continue to: