C-l NOTES ON PLATE-GIRDER DESIGN 



end being 1 web plate 48X& and 4 angles 6X6X19.2(4), the end 

 reaction being 180,000 Ibe. 



APPEND1 \ 



ART. 13. POSITIONS OF LOADING FOR MAXIMUM SHEAR 



AND MOMENT 



The shears and moments, which are necessary for the 

 design of plate girder bridges, are required for such a 

 great variety of span lengths within the limiting lengths 

 of span for such structures, that special methods of 

 computing and tabulating them are advisable. In the 

 principal Railway Engineers' Bridge Works and Consulting 

 Engineers 1 offices the major part of the structures designed 

 will be made for some standard loading. The loading 

 known as Cooper EM is perhaps more widely used than 

 any other for railway bridges. The quantities given in 

 Table No. 1 are for Cooper's EM and are similar to those 

 which should be determined and kept on record for any 

 standard loading to enable design to be made with proper 

 facility. 



SHEARS 



In computing shears it should be noted that for deck 

 bridges the maximum end shear is given for the engine 

 located so that either the first or last driving wheel stands 

 at the end of the span. 



The maximum shear at an interior point on the left 

 of the center of the span is given when the load extends 

 from the right and up to the point and perhaps a little 

 beyond. Every load that passes from just to the right 



