By D.E. Johnson, etc.
Hardcover with gilt lettering with out dirt jacket
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This method of strutting beams has been largely employed in timber bridges. W Let w = panel load = —. Let W = total uniform load o AC = CD = DB = ^. L = span. W Stress on tie rods CE and DF = W"=-^. AE CE AC — w—• CE = w—. Stress on AE = BF Stress on EF = stress on AB E F C D >v B Fig. 3 5 . A C D B Fig. 3 6 . These stresses are the stresses due to a full load, that is, . " c W when the points C and D are loaded with w = and they have the same value in both trusses, Figs. 35 and 36, but the tension in the straining beam AB in Fig.
P BRIDGE CONSTRUCTION. STRESSES IN FRAMED STRUCTURES. 51 The construction of the diagram is as under : Draw a vertical line ab to any convenient scale = W = 12\ tons. From a draw ac parallel to B"C" and be parallel to B"C, and from c draw cd parallel to CC". I2i Tons. ,, Then will ac, cb, and cd give the stresses in B C", CB", and CC" respectively. The stresses in the other spans determined in a similar manner are written down on each member in the diagram, Fig. 33. : Live load, 1 ton per foot run | = Dead load, 5 cwt.
GANTRY TRUSS. Gantry Truss. Example, w =dead load = 3 cwt. per lin. foot = 3 tons per panel v/ = live load = 9 cwt. per lin. foot = 9 tons per panel. w + w' = W. 53 54 BRIDGE CONSTRUCTION. The maxima stresses in the top and bottom chords occur when the truss is fully loaded as in Fig. 40. Under this con dition of loading the diagonals in the centre panel BC' and B'C bear no strain and may be omitted, but under a moving load, advancing from left to right or right to left, when only one panel point B or B' is covered as in Figs.
A Handbook of Active Filters by D.E. Johnson, etc.