48 INFLUENCE DIAGRAMS 



and 



, T>T / 7 \ 



nn = -j-BL - T- (s 1%) = 0,2 



, 7 . 



12 12 



Therefore the triangle DEL is the influence diagram for 

 TF22 7 , where TF2 = 1. Combining this' with the base 



12 



diagram, the shaded figure EFBL is obtained as the influence 

 diagram for loads in this span. 



For loads in the suspended span the influence diagram 

 is the shaded area ELM. 



The criterion for wheel loads producing the maximum 

 moment is found as follows : 



Without stating the intermediate equations 



6M S TTr f s-b . J , TTr , f J . TTT {s-l 



or 



W 2 W 2 ' W* s-l 



If-fe~fc, 



^=SS 3 ( 8 ) 



CONTINUOUS AND PARTIALLY CONTINUOUS TRUSSES OF 

 TWO EQUAL SPANS 



Partially Continuous Truss. In Fig. 34 is shown a 

 common form of the revolving draw-bridge. The two 

 end spans are equal and are separated by an unbraced 



