Cyclopedia of Civil Engineering Volume 3

Cyclopedia of Civil Engineering Volume 3

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ...employed in the preceding illustration might be used here, but we explain another which is very simple. The truss and its loads are represented in Fig. 37. Evidently the resultant of the three wind loads equals 12,400 pounds and acts in the same line with the 6,200-pound load. If we imagine this resultant to replace the three loads we may regard the truss acted upon by three forces, the 12,400-pound force and the reactions, and these three forces as in equilibrium. Now when three forces are in equilibrium they must be concurrent or parallel, and since the resultant load (12,400 pounds) and It, intersect at, the line of action of Rj must also pass through O. Hence the left reaction acts through the left support and O as shown. We are now ready to determine the values of R, and R, . Lay off AB to represent the resultant load, then from A and B draw lines parallel to 1 and R, and mark their intersection C. Then BC and r.V represent the magnitude and directions of R and R respectively; they scale 0: jS0 and 8,050 pounds. The slight differences in the answers obtained from the different sets of equilibrium equations are due to inaccuracies in the measured arms of some of the forces. Fig. 38. EXAMPLE FOR PRACTICE. 1. Determine the reactions on the truss represented in Fig. 26 due to wind pressure, the distance'between trusses being 15 feet, supposing that both ends of the truss are fastened to the supports.. j Reaction at windward end is 6,682J pounds. ( Reaction at leewird end is 3,037$ pounds. VII. ANALYSIS OF TRUSSES (CONTINUED); METHOD OF SECTIONS. 38. Forces in Tension and Compression flembers. As explained in "Strength of Materials" if a member is subjected to forces, any two adjacent parts of it exert forces upon each other...
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Product details

  • Paperback | 104 pages
  • 189 x 246 x 6mm | 200g
  • United States
  • English
  • black & white illustrations
  • 1236742389
  • 9781236742384