82 STANDARD SPECIFICATIONS 



for normal concrete (Par. 375) reinforced by structural steel 

 (Par. 372) the following values in pounds per square inch, except 

 as modified in Pars. 349 and 350: 



(a) Axial tension: 



Concrete none 



Steel, net section 15,000 Ibs. (40%) 



(b) Bending: 



Concrete in tension none 



" compression, generally 600 Ibs. (30%) 



, on bottom side of con- 

 tinuous beams near support 700 ' (35%) 



Steel in tension 15,000 " (40%) 



' ' compression 9,000 ' l 



[Or 15/c, where f c is the allowable stress on the concrete, given 

 below under (c)]. 



(c) Axial compression, on the concrete: 



1. Columns whose -r^lS diameters. 



2. Columns whose -7 > 18 diameters. 



1 1600 \d 



where f c = allowable unit stress, given above for columns of 12 



diameters ; 



I unsupported length of column in inches; 

 d= least width, or diameter, of effective area of column in 

 inches. (Par. 359.) 



