Notes on Building Construction; Arranged to Meet the Requirements of the Syllabus of the Council on Education, South Kensington Volume 4

Notes on Building Construction; Arranged to Meet the Requirements of the Syllabus of the Council on Education, South Kensington Volume 4

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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. 1891 edition. Excerpt: ...depth to prevent the fibres being crushed; this condition is fulfilled by 2t(a-d)rt-2ntdrb = 2iarc... (87). Again, the length of the indent and the distance AB must each be sufficient to prevent shearing off of the wood. The resistance to shearing of either is ear, therefore t(a--d)r(--ntdri, = ear, .. (88). From these equations the various dimensions can be found. As an example take the following data, which assume that the wood is of fair quality Baltic fir. o=12," 6 = 8," n = 4," d = l," rt= 12 cwts. per square inch, Table I A, p. 328. JV, = 10cwta, r, = l-3 cwt. Tft = 12 cwts. Substituting these values in Equations 86 and 87, we get 2t = 8-2i, or t = A-i. And t(12-f)12-4txf x 12 =tx 12x10, or 99=120i. Therefore 99(4-1) = 120t, 219 = 396, i= 1'8 inch, and t = 2-2 inches. Again, from Equation 88 we have 2-2 x (12-) x 12-4 x 2-2 x x 12 = x 12 x 1-3, whence c= 14 inches, or say ll inches. It would probably be better in practice to neglect the resistance offered by the bolts, and take them as only holding the joint together. To adapt the above equations to this case it is only necessary to omit the term Zntdrb. The equations then become 2 = 6-2t, t(a--d)rt = iarn t(a--i)rt-ear, . Taking the same data as before, t = 4-i, (12-f)12 = ixl2x 10, whence (4-t)135 = 120t, .135x4 or t = 256--= jncneai Hence t = 4-2-1 = 1-9, and from Equation 88 l-9(12-f)12 = ex12x1-5, 1-9 x 11-25x12 or e =, 12x1-5' = 14 J inches nearly. It appears strange that the value obtained for e in this case should be so little greater than in the first case, but the reason is that the beam is much more weakened than in the first case owing to the greater depth of the indent, as...show more

Product details

  • Paperback | 104 pages
  • 189 x 246 x 6mm | 200g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236746643
  • 9781236746641