International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 683
find by reference to Art. 1809, that for endwisecrushing stress we may use a working stress of 3,000 lb. persq. in. Hence, to resist this stress of 21,500 lb., we must add to the area of the needle-beam ^V^—— = 7.17 sq. in., 3,000 ^ nearly. To hold the strut q in place, ribs cast with the strutfit… … RAILROAD STRUCTUREvS. 12G9 its cross-section, and to insure ample strength we increasethe depth of the needle-beam to 12 in. The straining rods are fitted at both ends with nuts andheavy cast washers which cover the entire end of the needle-beam, as shown in the cross-section (T, and in detail at…
Railroad engineering
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