230 CORRUGATED STEEL 



Copper rivets weighing about 6 pounds per 1000 rivets have com- 

 monly been used for closing rivets ; but galvanized iron rivets made of 

 vey soft wire and weighing about 7 pounds per 1000 rivets are fully 

 as good, and cost 7 cents per pound in 1903 as compared with about 

 25 cents per pound for copper rivets. The weight of copper rivets is 

 given in Table XVII. 



Strength of Corrugated Steel. The safe load per square foot for 

 corrugated steel supported as a simple beam, for sheets with 2^ -inch 

 corrugations and of various gages is given in Fig. 112. This diagram 

 is based on Rankine's formula 



where W = safe load in Ibs. ; 



S = working stress in Ibs. ; 

 h = depth of the corrugations in inches ; 

 b = width of the sheet in inches; 

 t = thickness of the sheet in inches ; 

 / = clear span in inches. 



= Safe load .. 

 5 = working Stress =15ooo IbS. 

 h depth of corruqaTion-ins. 

 b = width of Sheet in inches 

 t == thickness of sheet in inches 



~ clear span in in 



FlG. 112. 



UNIFORM LOAD IN POUNDS FOR CORRUGATED STEEL FOR 

 DIFFERENT SPANS IN FEET. 



A summary of experiments to determine the strength of corrugated 

 steel made by the author's assistant, Mr. Ralph H. Gage, is given in 



