. Details von vernieteten Eisenbahntraversen Brücken. 100 00^,N 000 00 -Q !ooooo,od/Qo; o ooo [00 61 3 iqoooooooooo!ooooo;ooooo!ooooQ Schwein. . Manchmal besteht der Zwischenpfosten aus channeliund der untere Akkord aus Winkeln wie Abb. 58. o > o o O OOOOOOOO 0 ooooooooooo o o o o o o o o o o 0 o o o o p o r Pig.62. In diesem Fall wird das Detail von Pig.62 gezeigt, die Zwickelplatte ist außerhalb der beiden Elemente vernietet und Jiakes eine gute Verbindung. Der untere Akkord kann klein und effizient gemacht werden. Ein eigenartiges Design für die Verbindung des Bodenakkordes mit dem Zwischenpfosten ist i dargestellt
2372 x 1054 px | 40,2 x 17,8 cm | 15,8 x 7 inches | 150dpi
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. Details of riveted railroad truss bridges . 100|00, N^ -Q !Ooooo, od|Qo; o ooo [000 00|00i00l0 00 3 iqooooIooiooIoooo!ooooo;oaoo!oooQ Pig.61. Sometimes the intermediate post is made up of channeliand the bottom chord made up of angles as Fig.58. o > o o O OOOOOOOO 0 oooooooooo o o o o o o o o o 0 o o o o p o r Pig.62. In this case the detail is shown by Pig.62, The gusset plate is riveted outside of the two members and Jiakes a good connection. The bottom chord Can be made small and efficient. A peculiar design for the connection of the bottomchord to the intermediate post is shown in Pig.63. The detailshown is simple in construction^but lacks in rigidity on accountof the lower chord being discontinuous, and it does not seem to -36- be a popular form of construction for heavy bridges probablj- onaccount of the excessively large connection plate required.. Fig.63. For a standard detail of this connection the practiceseems to be in favor of a continuous lower chord and large gussetplate riveted either on the inside or outside of the lower chord, according to the make-up of its section. Art. 7. Diagonals. In order to make a bridge rigid it is necessary to havediagonals in each panel. These dia.gonals are designed to taketension in some bridges and compression in others. The diagnolsnear the centre of the bridge are called on to take a reversal ofstresses due to the total shear changing from positive to neg-ative or vis-a-versa. To prevent this reversal a counter isplaced in the bridge. This counter consists of another diagonalplaced in the opposite direction from the main diagnals. In themiddle panel and the panels adjacent to it there are usuallycounters, -37- The sections used for the counters or diagonals aresimilar to those used for verticals. The two common forms beingthe two-channels-and lattice-bars section and the section com-posed
