The Railroad Engineers Practice

Cover The Railroad Engineers Practice
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BRIDGES.
Simple beam uniformly loaded, rectangular : Let W = the breaking weight in pounds. " b the breadth of the beam, in inches. ; d = the depth of the beam in inches. " L the length of the beam in inches, " S = a constant which has been determined by experiment.
The value of Sis, for oak, 10, 000; for white pine, 7, 000 ; for wrought iron, 40, 000 ; for cast iron, 30, 000.
4 bd* ~ Y ~E~ Beam uniformly loaded, cylindrical : Let r = the radius in inches, the other letters being as before.
W =
... 3. 1416 r.
L Beam uniformly loaded, I-shaped section : If the flanges are of the same size, as they always are in rolled beams : Let d = the depth of one of the flanges. " d' = the depth of the connecting piece. " A = the area of one of the flanges. " A' = the area of the connecting piece. 4 8 ( d'* (A W= - 4 3 L i' 8 (A + A') ) d'+2d r When the load is supported in the middle, instead of be- ing uniformly distributed, the breaking load in each of the foregoing cases becomes only half as much.
The king-post truss : W AC Strain on C D = W; strain on A C and CB = 2 CD.


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