. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. ions. FiEST Method. Component Component Total Stress. Stress. Resultant Permanent Load. Ship. Stress. Tons. Tons. Tons, At centre - 797 + 1943 = + 1146 50 ft. from „ - 709 + 1745 = + 1036 100 ft. „ „ - 448 + 1129 = + 681 150 ft. „ „ - 114 + 368 = + 254 Second Method. At centre - 797 + 1041 = + 244 50 ft. from „ _ 709 + 944 = + 235 100 ft. „ „ - 448 + 652 = + 204 150 ft. ;; „ - 114 + 202 = + 88 The above results are combined in Table I. ;— Table I. Long ship, heavy in centre,light at ends. Short heavy ship.
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. ions. FiEST Method. Component Component Total Stress. Stress. Resultant Permanent Load. Ship. Stress. Tons. Tons. Tons, At centre - 797 + 1943 = + 1146 50 ft. from „ - 709 + 1745 = + 1036 100 ft. „ „ - 448 + 1129 = + 681 150 ft. „ „ - 114 + 368 = + 254 Second Method. At centre - 797 + 1041 = + 244 50 ft. from „ _ 709 + 944 = + 235 100 ft. „ „ - 448 + 652 = + 204 150 ft. ;; „ - 114 + 202 = + 88 The above results are combined in Table I. ;— Table I. Long ship, heavy in centre,light at ends. Short heavy ship. Long heavy ship. Resultant Stresses on MainGirder Flanges. First assumed distribution. Second assumed distribution. First assumed distribution. Second assumed distribution. First assumed distribution. Second assumed distribution. At centre .. .. 50 ft. from „ .. .. 100 ft. „ „ .. .. 150 ft. „ „ .. .. tons+ 1599+ 1393 + 858+ 286 tons+ 733+ 675+ 498+ 216 tons+ 1511+ 1280+ 703+ 195 tons+ 936+ 838+ 542+ 195 tons+ 1146+ 1036+ 681+ 254 tons+ 244+ 235+ 204+ 88. The effect of the water ballast upon the stresses on the flanges of the main girders is shown bycalculation B, p. 445 ; from which it will be seen that the amount by which the stresses in the lasttable would be increased, if there were no water in the ballast chambers, is ;—At centre, 654 tons ;50 ft. from the centre, 585 tons; 100 ft. from the centre, 381 tons; and 150 ft. from the centre,102 tons. DOCKS. 449 If these chambers were left open to the outside water, so that the contamed water would belevel with that in which the dock was floating, or in other words so that the depth of water in theballast chambers would equal the draught of the doclr, then the redaction of the stresses would befrom y\ to -i^i- of that given above, according to the draught of the dock; but when really most required,with the short ship of small maximum but great proportional load, the relief aflbrded to the maingii-
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
