Cyclopedia of Architecture, Carpentry and Building; A General Reference Work Volume 3

Cyclopedia of Architecture, Carpentry and Building; A General Reference Work Volume 3

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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. 1907 edition. Excerpt: ... snow load must be drawn. Such diagrams are drawn like those for permanent dead load. 29. Analysis for Wind Loads. Stresses due to wind pressure cannot be computed from permanent load stresses; they can be most easily determined by means of a stress diagram. Since wind pressure exists only on one side of a truss at a time, the stresses in corresponding members on the right and left sides of a truss are unequal and the whole stress diagram must be drawn in analysis for "wind stresses." Moreover, where one end of the truss rests on rollers, two stress diagrams must be drawn for;i complete analysis, one for wind blowing on the right and one for wind blowing on the left (see Example 2 following). Examples. 1. It is required to analyze the truss of Fig. 16 for wind pressure, the distance between trusses being 14 feet. The apex loads for this case are computed in Example 3, Page 26, to be as represented in-Fig. 28. Supposing both ends of the truss to be fastened to the supports, then the reactions (due to t"he wind alone) are parallel to the wind pressure and the right and left reactions equal 3,600 and 7,200 pounds as explained in Example 2, Page 57. To draw a clockwise polygon for the loads and reactions, we lay off BC, CF, and FF' to represent the loads at joints (1), (2), and (4) respectively; then since there are no loads at joints (5) and (7) we mark the point F' by C' and B' also; then lay off B'A to represent the reaction at the right end. If the lengths are laid off carefully, AB will represent the reaction at the left end and the polygon is BCFF'C'B'AB. At joint (1) there are four forces, the reaction, the load, and the two stresses. AB and BC represent the hist two forces, hence from C draw a line parallel to cd and from A more

Product details

  • Paperback | 94 pages
  • 189 x 246 x 5mm | 181g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236500415
  • 9781236500410