. Details of riveted railroad truss bridges . used. A detail used in light railroad bridges is shovm This detail is a popular one on account of the littlespace the ends occupy at the connection of the top chord and thepost. Por ordinary spans in riveted railroad bridges the detailshown in and 55 are most coimnonly used. Both afford aneasy means of connection to the top chord and the floor-beam. There is but one detail for the connection of the inter-mediate post to the top chord. This consists of making the -32 width of the post somewhat smaller than the width of the topchord
. Details of riveted railroad truss bridges . used. A detail used in light railroad bridges is shovm This detail is a popular one on account of the littlespace the ends occupy at the connection of the top chord and thepost. Por ordinary spans in riveted railroad bridges the detailshown in and 55 are most coimnonly used. Both afford aneasy means of connection to the top chord and the floor-beam. There is but one detail for the connection of the inter-mediate post to the top chord. This consists of making the -32 width of the post somewhat smaller than the width of the topchord and placing this up inside of the top chord as shown In the detail shown the intermediate post consists offour angles and lattice bars. The same detail would he used ifthe intermediate post was made of channels placed as shown If the flanges were turned out the flange would be cut I olooo; o o oloiojo oio;o|o oolo,o o;oi Oi 0 oioi \oo/ oo o o d o oo O OqO o o o o o o o oo o c o oo o c o oo o o o o oooo O off, which is bad practice. If a diagonal intersects the top chord at this pointthe detail is modified as shown in Ihera the plateextends as it does below the top chord sufficient rivets can beplaced in the intermediate post without extending it up into thepost as done in the preceeding example. The Burnhara Bridge on the Maine Central Railroad hasa neat connection for the intermediate post to the upper upper chord consists of a built-up section of four anglesand two plates joined by lattice bars. The intermediate post iscomposed of two channels connected by lattice bars. The connect-ion is shown in 33- It will be noticed that the gusset plate is inside the channeland that the channels are spaced the same as the upper chord. An angle is riveted to the lower flange of the top chord andweb of the channel. This connection affords a bearing surfacefor the intermediate post and fewer rivets can be used. Thedeta
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