Download e-book for kindle: A Handbook of Active Filters by D.E. Johnson, etc.

By D.E. Johnson, etc.

ISBN-10: 0133724093

ISBN-13: 9780133724097

Hardcover with gilt lettering with out dirt jacket

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Sample text

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.

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A Handbook of Active Filters by D.E. Johnson, etc.

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