The Elimination of a Grade Crossing At Downers Grove, Ill.

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Hence the following cre- terion which is proven in standard works on "Strength of Materials" is used "The bending moment in a simple span is a maximum, when the shear passes through passes through zero." - ...
: - 23 Subway .
Several sections are tried in Pig. 3 and the shear obtained on the left of the section. The following result was obtained at a section 29 '-0" from the left support.
24.8 x 4.20 x 935 L.L. A. = 48,700 2 D. L. A 29.0 x 7.35 x 480 = 51,100 2 Totals 99,800 The Shear =99, 200
...- 99,800 which is equal to practically zero.
Hence the bending moment on the plate girder is a maximum at 29'-0" from the left support.
Bending moment at this section (99,200 x 29 - 48,700 x 24.8/3 -51,100 x 29/3 ) x 12 = 23,700,000 "# B.M.
In Well's "Steel Bridge Designing" a total weight of 19,000# is given for a through plate girder 48* -6 ""long. The total bending moment on the girder is 31,478,400 -' ■ 1 - r t 24 Subway.
The weight of two girders of the same span vary directly as the bending moment.


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