334 



CAMBBIA STEEL. 



EXTRACTS FROM THE BUILDING LAWS OF 

 VARIOUS CITIES. 



ALLOWABLE UNIT STRESSES FOR STEEL AND IRON. 

 (Revised to 1917.) Pounds per Square Inch. 



L = Length in inches; R = Radius of Gyration in inches; D = Diameter 

 or Least Dimension in inches. 



FORMULAE: 



1100 



J K 

 L 



(C) 14000-80^ 



IX 



14000 



(D 



1+ 1000R2 



16000 



~ L2~ 



H ~20000R2 



12000 



(M) 



1400 



1 + 





(N) 



600 D2 

 14000 



1 + 



13 500 R2 



1+ 20000R2 

 (J) 17100-57^- 



J\. 



(K) 10 600 - 30^- 



J\. 



(b) 85% for soft steel. 



1 850 D2 

 (O) 16 000 - 70 



(P) 12 000 - 60 D - 



JV 



(Q) 10 000 - 60- 



