302 STRESSES IN A PRATT TRUSS FROM WHEEL LOADS. Art. 153. 



Wheel 3 at joint 4, wheel 17, 2 ft. from end of span. 

 14131 



154 

 230 

 22 



= 91.8 



Shear = 81. 4 

 .35.6 



Ds-.81.4X- 



28 



= 1X29.15X 



35.6 



~28~ 



= 103.5 (-)!/. L. 

 37.1 (-)D.L. 



140.6 (-) Total 

 joint 3, wheel 14 at end of bridge, 



Rt = = 10.45 



22 



Shear =46.22 

 Wheel 2 also satisfies the criterion at joint 3. 



p w q f\A 



J.I/A. = O.vJTC 



22 



Shear =46.15 

 Wheel 3 gives a slightly greater shear. 



Z> 4 =46.22 X = 58.8 (-) L. L. Total. 



28 



Wheel 2 at joint 2, wheel 9 ; 4 ft. from the end of the bridge. 



Shear =22.8 

 ',=22.8X^ =29.0 (-)L.L. 



2S 



35.6 



1X29.15X^=37.1 (+)D.L. 



No reversal. 



