l.M> ! 1 \UING8 61 



The lower plate of the two shown at each end is 



wall plate. 



face of the wall plate at (6), the 



Mon ,-!!. should be planed. 



The wall plates are held in position by the two anchor 

 bolts at each end. 



The bearings at the ends of the girder, when of two 

 simple plat.--. -h..uld not be too wide, an the tendency 

 of the bearing i* to overload the masonry along the portion 

 . ,1 by the bottom flange of the girder. 



The bearing for this case will !* made 18X18". 



The two plates which project beyond the bottom flange 

 angles must be strong enough in flexure t<> distribute the 

 load on the bridge seat. Each inch of length of the plates 

 may be considered acted on in a transverse dim t ion by 

 the forces shown in (d). 



Tin- Ix-nding moment then 

 -5400(9/2 -6.18/2) -5400X1.41 -7614 in.-lbs. 



If the sole an- 1 u all plates be made of equal thick neat, 

 thru th< :<: moin.-nt of each plate must be 3807 



in.-lbs. 



The depth (or thi.-kness) of plate required may be 



O? O 



obtained from 3/-^---3807 or (P- 



and d- 1.25" about 



These plates should neither of them be less than J" 

 thnk. .- \vn if a less thickness would furnish proper strength. 



For small spans generally only two pairs of stiffenen, 

 one over the outer and the other on the inner edge of the 

 I, are used. 



