FLOOR PANELS. 



QQ 



ami i <t In -r conditions. For buildings a few stories in height it is economical to space the columns 

 closely together, while in high buildings a spacing of 16 ft. to 20 ft. will commonly be found eco- 

 nomical. The columns in the Singer Tower in Fig. 22 were spaced 12 ft. centers; the columns in 

 tlu- (Guaranty Trust Company's New York Building, 162 ft. high were spaced about 16 ft. by 16 

 ft. and 21 ft. 6 in. by 19 ft. 9 in.; the columns in the Woolworth Building, New York, were spaced 

 .it -listances varying from 18 ft. 6 in. by 18 ft. 6 in. in the main part to a maximum of 28 ft. by 

 28 ft. in the tower. 



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FIG. 22. TYPICAL FLOOR PLAN OF SINGER TOWER. 



FLOOR PANELS. For the long span system, floor girders connect the columns forming a 

 square or rectangle, the floor slabs being supported on the floor girders. For the short span 

 system, floorbeams are carried by the floor girders and the spans for the flooring are reduced. The 

 spacing of the floorbeams will depend upon the type of floor, but it will commonly be found eco- 

 nomical to use an even number of floorbeams giving an odd number of short spans in each panel. 

 A common arrangement is to use two floorbeams which divide each panel into three short spans. 



