. Details of riveted railroad truss bridges . In this detail, which is in reality an end strut ,the stringerto passes over. This avoids using the stringer bracket. IToattempt is made to construct a rigid fastening to the end post for little weight is taken at that point. The top flange ofthe strut passes over the top of the end post, and is riveted tothe cover plate by means of a bent plate. The only stress thatis brought on this connection is weight due to the member itselfand any twisting movement that occurs. The argi^ment in favorof this detail is the ease with which the road bed a
. Details of riveted railroad truss bridges . In this detail, which is in reality an end strut ,the stringerto passes over. This avoids using the stringer bracket. IToattempt is made to construct a rigid fastening to the end post for little weight is taken at that point. The top flange ofthe strut passes over the top of the end post, and is riveted tothe cover plate by means of a bent plate. The only stress thatis brought on this connection is weight due to the member itselfand any twisting movement that occurs. The argi^ment in favorof this detail is the ease with which the road bed and bridgecan be joined on account of the stringer extending past the endof the bridge. -15- One drawback to this detail is the form of bridgeseat that is required. In order to have a place for the hearing,it is necessary for the centre position of the bridge seat to beraised some -Tig. 20. At one time the end floor-beams were used only in long present they are used almost entirely, and a number of rail*roads have adopted them as standard construction. o o o o o d 0 |0 o o o o O 0 o o 0 o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o |o O O 0 o o o o o o o o o o o o o o Perhaps a more difficult problem is tha intermediatefloor-beam connections. This is made difficult on account of theproximity of the lower chord. In deck truss bridges the lower chord does not inter- -16- fere and a detail similar to will serve. This floor-beamis made up of plates and angles with stiffeners under each string-er. These stiffeners consist of four angles, two on each sideplaced back to back. The end angles are field riveted to theintermediate posts. All that is necessary is to have enoughspace for the required number of rivets. 0 o c o o o (3V o O O 0 o] o o o o o \ O O O Oi o 0 o o o o o
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