272 



STRESSES IN A CAMEL-BACK TRUSSv Art. 137. 



53.5 



40X34,290 

 53.5 



Center of moments at a, 

 ArmofDi 



=25,630 Ibs. (-) L. L. 



36,840 Ibs. (-) Total. 



- 1 - Arm of D 3 = 107.5 ft. 



24 Length of D 3 



107.5D 3 = 80#i- (100 + 120)P=20P, for dead load. 

 =80tf i =80 X ^P, for live load. 



107. 



107.5 



18,870 Ibs. ( -) Total. 



D 4 is best obtained from the shear in the panel, as the 

 chords are horizontal. 



D 4 =0 for dead load. 



=f X 16,000 sec 3 = 16,850 Ibs. (-) L. L., Total. 

 Center of moments at d, 



Arm of D's 120 



- - Arm of Z>' 3 =97.67 ft. 

 28 Length of D' 3 



97.67Z>' 3 = 80# 2 -(100 + 120)P=20P, for dead load. 



= 220#i=220XfP, for live load (considering part 

 to the left of the section). 



97.67 



220X6,860 

 97.67 



= 2,050 Ibs. (+) D. L. 

 = 15,450 Ibs. (-) L. L. 



13,400 Ibs. (-) Total. 

 Center of moments at c, 



Arm of D' 2 60 



Arm of D' 2 =46.1 ft. 

 24 Length of D' 2 



46.1D' 2 =40# 2 -60P = 60P, for dead load. 

 = 180#i = 180 X|P, for live load. 



13,0 10 Ibs. (+) D.L. 



= 180X2^0 =8>92()lbs ( _ } LL 

 4o.l 



No reversal. 



