EXAMPLES OF TRUSS BRIDGES. 



185 



without cover plates, so that the ties may be of uniform thickness and there will be no rivet heads 

 to iiiUTlVrv with placing the ties. The lower flanges arc made of angles with cover plates. These 

 plans represent the most modern practice in the design of deck plate girder railway bridges. 



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4 a $ "JB 



L EHD FLOOR BEAM 



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tfX P + WA7'TJ* 12 ?! 



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FLOOR teAH STRUT 



END FLOOR BEAM 



FIG. 30. END FLOORBEAM CONNECTION. A. T. & S. F. RY. 



Details of a 6o-ft. span single track through railway plate girder bridge as designed for the 

 larriman Lines are shown in Fig. 37. The details of the bearings are shown. Rollers are used 

 ar the expansion ends of spans of 75 ft. and over. Data on standard plate girder bridges designed 

 ider Common Standard Specifications 1006 are given in Table I. 



EXAMPLES OF TRUSS BRIDGES. The marking diagram for a truss railway bridge is 

 down in Fig. 38. The lower chord joints are marked Lo, L\, Lt, etc., while the upper chord 

 )ints are marked Ui, Uz, etc. In detailing a truss an inside view of the left end of the farther 

 iss is shown; this is marked right as shown. Details of a single track through riveted truss 



