SIMPLE TRUSSES 



and 



17 



. . . ,45, 



which is the required criterion. 



In case the chords are parallel s becomes oo and the 

 criterion is 



W 



d 



(46) 



Upper Segment of Diagonal in Sub-strut Truss. Refer- 

 ring to Fig. 9, it is clear that the diagonal UV has the 



stress of UL', the diagonal of the main truss, as the 

 auxiliary truss LVL" simply serves the purpose of a 

 trussed stringer extending from L to L". The influence 

 diagram is constructed according to the general rule taking 

 the length of the cut stringer as the horizontal projection 



