Instructions on Modern American Bridge Building by G. B. N. (George Bates Nichols) Tower
page 53 of 57 (92%)
page 53 of 57 (92%)
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in pounds. Extension Compression.
White Pine. 26 12,000 6000 1229 Yellow Pine. 31 12,000 6000 1185 Pitch Pine. 46 12,000 6000 1727 Red Pine. 35 12,000 6000 1527 Virginia Pine. 37 12,000 6000 1456 Spruce. 48 12,000 6000 1036 Tamarack. 26 12,000 6000 907 Canada Balsam. 34 12,000 6000 1123 White Oak. 48 15,000 7500 1743 Red Oak. 41 15,000 7600 1687 Birch. 44 15,000 7000 1928 Ash. 38 16,000 8100 1795 Hickory. 51 15,000 7200 2129 Elm. 45 16,000 8011 1970 The above table is compiled from a much fuller one in Vose's Treatise on R.R. Construction. TABLE OF BOLTS AND NUTS CALCULATED FOR A WORKING STRAIN OF 15,000 LBS. PER SQUARE INCH OF SECTION. Diameter. Area. Strength in Weight per Thick's No. thr's Inches. Sq. inches. Pounds Foot. Square nut. of nut. per inch. 1/2 .19635 2940 0.66 1-1/4 in 3/4 in 12 |
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