. Details of riveted railroad truss bridges . 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 s
. Details of riveted railroad truss bridges . 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 There is an objection to this detail on account of the fact thata load applied near the end causes a tension in the rivets whichfasten it to the floor beam. To overcome this fault the web ofthe floor beam is slotted and a splice plate is allowed to takethe tension. Fig. 6 shows the method of making this detail. In deck bridges the stringers are often placed on thefloor beams and fastened to them by rivets through the lower flange of the stringers. When this system is used, or when the ; il span of the stringer is very long, a system of cross bracing isused. Fig. 7 and 8 show two simple methods for bracing the two. | In the New York, 3Jew Haven & Hartford Railroad theend floor beam is sometimes omitted and the stringer rests upontheabutment. In order to bring the stringer to the right II 7- level a detail similar to Pig. 9 is used. This is fastened toa masonry by means of bolts in slots in order to allow a length-wise movemient,
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Keywords: ., bookcentury1900, bookdecade1900, bookiddetails, booksubjecttheses
