CONTINUOUS TRUSSES 



47 



For loads in the suspended span the influence diagram 

 is the shaded area KLM. 



The criterion for wheel loads which produce the max- 

 imum positive moment is 



i 2 



(76) 



FIG. 33. 



Diagonal of Cantilever Span. Referring to Fig. 33, for 

 loads in the cantilever span M L = -W 2 a 2 , M B =0, and 





(77) 



The influence diagram for m s is the base diagram shown 

 by the heavy lines in Fig. 33. From the triangle DBL, 



n'n : BL ::a 2 : 1 2 , 



