A Text-Book on Roofs and Bridges Volume 1

A Text-Book on Roofs and Bridges Volume 1

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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. 1898 edition. Excerpt: ...of which is 10.5 X 1.667 or + 17-5 tons. In like manner the stress in Ee is--42 tons and in Ea-f 59-8 tons. For the stress in any panel of the chord ae either the method of increments or the method of moments may be used. By the latter we have 1 10 1 20 1 40 S =-X 10.5X-+-X21 X-+-X42X--= 73.5. This completes the determination of the maximum stresses, except for counter-ties Ed, Cd, etc., which cannot act under normal conditions on account of the absence of a lower chord. It is well, however, to insert such counters to provide against accidents. This form of truss is going out of use. Prob. 80. Find the stresses for Fig. 64, if the span be 100 feet the depth 20 feet, the dead load per panel 2 tons, and the train load 14 tons, preceded by one panel of locomotive load weighing 22 tons. Prob. 81. If a load be at b in Fig. 64, what part of it goes to each abutment, and how? Art. 54. The Baltimore Truss. This modification of the Pratt type was introduced in order to avoid long panel lengths. In the deck form given in the figure all the ver the counters Fig-65 being shown in broken lines. The members Bb, Dd, etc., are sub-verticals that are strained only by the panel loads which they directly bear. Let the span be 140 feet, having each panel of the upper chord 10 feet in length, and the depth 20 feet. The dead panel load is 34 tons, the live 8 tons, and the locomotive 15 tons, which is to be taken for two panels preceding the train. It is required to find the maximum stresses in all members. The posts Bb, Dd, Ef and Hh have each a maximum stress of 3.4 + 15 = 18.4 tons compression. The maximum chord stresses occur when the points b and c have the locomotive load, and the other points the train load. The left reaction for dead and live loads then...show more

Product details

  • Paperback | 48 pages
  • 189 x 246 x 3mm | 104g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236853989
  • 9781236853981