. Details of riveted railroad truss bridges . e 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 su
. Details of riveted railroad truss bridges . e 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. Thedetail is good. What has been said of intermediate post is truealso of the hip vertical. The same sections are used and thesame connection made. The hip vertical always takes tensionand on account of the magnitude of the stress larger platesmust be used. The detail is the same. The ease with which thisdetail is constructed is a decided argument in favor of theriveted Bottom Chord. In pin connected bridges it is common practice tomake the lower chord of the bridge of eye-bars^ but in the rivetedtruss the lower chord is made of built-up sections. 34 The most common section used are shown in the sketches below. consists of two pairs of angles held in shape bylattice hars, shows another similar detail made of fourangles and plates. This has no advantage over the first exceptin additional area. All the other forms of box girders used for top chord and intermediate post section can be used forlower chord in this type of bridge. A light member can usuallybe used on account of the stress being tension in all two forms most commonly used are those shown in andthe section which consists of two channels and lattice of these permit a neat and easy connection for the endand intermediate post. bottom chord will be considered here. ITo nev; difficulties arise,an
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