DEAD AND SNOW LOAD STRESSES 



95 



loads producing stresses in the truss are laid off to the prescribed scale, 

 A\-y being the left, and y-x s the right reaction. The stresses are cal- 

 culated as follows: Beginning with the left reaction, x^y, draw lines 

 through x^ and y f parallel to the upper and lower chords of the truss, 

 respectively, and the line x^-2. will represent the compressive stress in 

 the member ,\\-2. and y-2 will represent the tensile stress in the member 

 y-2 to the scale of the stress diagram. 



J fD 0' 5 10' 15 20' 



Dora 



Span, L, 60-0" C-Toc- 

 Length of Buiding,80^0"c-to c- 

 Distance c-to c Trusses ,I6'-0" 

 Height of Columns 20'^0" 

 Pitch of Roof 4 (6"m 12") 



60-0 



CASE I 



Dead Load I0lbs-persq-ft- hor- projection 

 Dead Load Stress Diagram 

 2000 4000 6000 



Compression 

 Tension 



Snow Load 20 IDS- per sq-ft hor proj 

 Snow Load Stress Diagram 



4000 8000 12000 



FIG. 53. DEAD AND SNOW LOAD STRESS DIAGRAM. 



Calculate the stresses in the remaining members in like manner 

 being careful to take the members in order around a joint in com 

 pleting any polygon. The indeterminate case at the joint t/ 2 , can b 



