CHAPTER XII. 

 STRESSES IN PORTALS. 



Introduction. Portal bracing is frequently used for bracing the 

 sides of mill buildings and open sheds. There are many forms of 

 portal bracing in use, a few of the most common of which are shown in 

 Fig. 58. 



1 H G F, F? 



v 1 ' 



B- 



^ R 



(a) 



I H 6 F: R 



t E 

 I 



I 



d 



-T- S- 



(d) 



6 f e d F, R 



(b) 





t 



C 



(e) 

 FIG. 58. 



(f) 



Portal bracing may be in separate panels or may be continuous, 

 The columns may be hinged or fixed at the base in either case. 



