. Details of riveted railroad truss bridges . Fig 2. This is a very common method for fastening the stringer to the floor beam and is used in both truss and plate-girder bridges. The only difference betweenihis connection and that of the I- A, -5 I beam is that no filler has to be inserted between the flangeangles of the floor beam and the connection angles of the string-ers. In case the end shear of the stringer is too great toallow enough rivets to be placed in the distance of its depth,a shelf-angle is placed under the I-beam or plate girder, andthis angle takes some of the shear. Th
. Details of riveted railroad truss bridges . Fig 2. This is a very common method for fastening the stringer to the floor beam and is used in both truss and plate-girder bridges. The only difference betweenihis connection and that of the I- A, -5 I beam is that no filler has to be inserted between the flangeangles of the floor beam and the connection angles of the string-ers. In case the end shear of the stringer is too great toallow enough rivets to be placed in the distance of its depth,a shelf-angle is placed under the I-beam or plate girder, andthis angle takes some of the shear. This shelf-angle is alsoused to facilitate erection, in which case stiffener angles arenot required. See Fig. 2, j. In a through truss difficulties are found on account of the great spacing of the ties at the end of the stringer. Amethod used to avoid this and make a continuous stringer flangeis to raise the stringer and allow the top flange of the string-erto pass over the flange of the floor beam. Fig. 4 shows this ^method. i Ihen the stringer comes to the end of a through bridgeit is often necessary to extend the stringer a foot or two past i 6 the last last floor beam. This is necessary in order to bringthe last tie on the bridge within about six inches of the firsttie on the abutment. To accomplish this a bracket is built upand riveted to the floor beams. Fig. 5. shows this detail asused by some companies.
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