Elementary Graphic Statics and the Construction of Trussed Roofs; A Manual of Theory and Practice

Elementary Graphic Statics and the Construction of Trussed Roofs; A Manual of Theory and Practice

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 edition. Excerpt: ... of division x, also bisecting it at a. On the same vertical line, lay off ab and ac, each = 10.71-r-2 tons, and divide be into 7 equal parts, marking these points of division y. The load line de represents the total load on the upper chord, one part axe also representing the load at one joint; be represents the total load on the lower chord, one part yy being the load at one joint. Joint A. The reaction evidently = half the total load on the entire trass, = ae-f-ab = be. Through b, draw y parallel to Y1 of Fig. 42, and through e, draw xl parallel to XI; these intersect at 1, and yl represents the strain in Y1, and xl, that in XI of the given trass. Joint B. Draw 1 2 and y2 parallel to 1 2 and Y2 of Fig. 42, intersecting at 2. Joint C. Draw 2 3 and xll parallel to the corresponding members of the trass, intersecting at 3. The mode of completing the strain diagram is sufficiently obvious. For sake of clearness, only one-half the diagram is here given. (129.) Strain, Diagram for Permanent and Wind Loads. In Fig. 42, make gG and Im each =.801 ton; also, gh = a. wind load = 2.018 tons, and mn half a wind load, = 1.009 tons; join Gh, which measures 2.78 tons, and In, which = 1.78 tons. In Fig. 44, make ah parallel to Gh of Fig 42, and = 2.78x3 = 8.34 tons; be parallel to In and = 1.78 tons; cd vertical and =.801X 3 = 2.403 tons; using the same scale as in Fig. 43. Join ad, which will be the resultant of the permanent and wind loads on the upper chord only. Choose a pole P, and by the method of the Equilibrium Polygon, as applied to Problem 1, find the dividing point/"; then af--reaction at A, and fd = reaction at O, for the loads on the upper chord only. Through f draw a vertical line, and make fq and fs each = ab or ac of Fig. 43 = 10.71 H-2...show more

Product details

  • Paperback | 40 pages
  • 189 x 246 x 2mm | 91g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236592840
  • 9781236592842