258 



DOUBLE-INTERSECTION WARREN TRUSS. Art. 135. 



As the stresses obtained in this manner are only approxi- 

 mate, it is useless to complicate the problem by separating the 

 dead load into the portions carried at the two chords, although 

 this may be done if desired. In what follows all of the loads 

 will be considered as applied at the upper chord. 



The case of full load will be considered first. Trusses b 

 and c are unsymmetrical about their centers, but if the reac- 



? \' I/ l/ 



: ** i +? [ * i * 



7 Equo/ Panels. 



Fig. 189. 



tions are first gotten and then the diagonal coefficients, with 

 their proper signs, the chord coefficients arc casly determined. 

 One end load will be assumed to act on truss 6 and the other 

 on truss c. 



Fig. 189 (6). R l = =shear in panels 6-7 and 5-6. 



Fig. 189 (c) . R , = = = shear in panel 6-7. 



Evidently, R 2 for the first truss is the same as R t for the 



