2I 4 



TOWERS AND TANKS FOR WATER-WORKS. 



Each side of the tower may now be analyzed graphically, 

 giving the stresses in the struts and bracing and additional stress 



\ 



FIG. B. 



FIG. C. 



in columns; these must be combined algebraically with the 

 stresses already found in them to obtain the maximum. 



Solution. 

 M =28,740X23.4 = 672,516 ft.-lbs.; 



V = 



.707X672,516 

 14.14 



33,625.8 Ibs.; 



sectf =1.01; 



=7 



then 



S =33,625.8X1.01=33,962.06; 

 R =F a tan (6) .707 



= 33,625.8Xo.i4X. 707 = 3331.28; 



W 



P = (.707) = 5079.79. 



The wind stresses having been determined as explained and 

 indicated on a diagram as shown in Fig. E, the loads due to 

 the weights must be considered and combined. 



