. American engineer and railroad journal . seen that A L and J K are in com-pression and that A J and K L are in tension. This methodwill apply to any case. In Fig. 1, members, in tension areindicated by single lines, members in compression by doublelines, and members which are under no stress, by dottedlines. In Figs. 5 and 6 is shown the application of the methodto the framing of a box car of usual design. It will be noticedthat in this case the points H and I, J and rC. B and V, andT and U coincide, showing that, as is to be expected, thereis no stress in these members. The closing line of
. American engineer and railroad journal . seen that A L and J K are in com-pression and that A J and K L are in tension. This methodwill apply to any case. In Fig. 1, members, in tension areindicated by single lines, members in compression by doublelines, and members which are under no stress, by dottedlines. In Figs. 5 and 6 is shown the application of the methodto the framing of a box car of usual design. It will be noticedthat in this case the points H and I, J and rC. B and V, andT and U coincide, showing that, as is to be expected, thereis no stress in these members. The closing line of the stressdiagram here is V A. In all cases the side sill is under an additional stress tothat shown above, due to carrying the floor load to the this should be separately calculated and added to thatpreviously found. It is believed that a study of the foregoing examples andmethod will enable anyone to solve all questions of carframing which will be met in usual practice. For illustration the problem is worked out in two i II <i I F L 1 D i C U ] 1 liij !«,.;. &w l;;hi jjh ■!:*•• J / F10 FIO. 8 Graphical Determination of Stresses in Car Framing. through A, parallel to A J, at J; through J draw a line, paral-lel to J K, intersecting one through G, parallel to G K, at K;through K draw a line, parallel to K L. intersecting onethrough A, parallel to A L, at L; through L draw a line, paral-lel to L M, intersecting one through F, parallel to M F, at M;through M draw a line, parallel to M N, intersecting onethrough A, parallel to A N, at N. This completes the stressdiagram as far as is necessary to obtain the stresses in thedifferent members, since the stresses are the same in thecorresponding members on the other side of the center lineof the car. But it is well to complete the diagram as shownin dotted lines, continuing from N in the same manneras above. If the work is correctly done the closing line ofthe diagram, in this case T A, will pass through the
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
