214 REINFORCED CONCRETE CONSTRUCTION 



Depth of Concrete Below Rods. 



SLABS 



Depth to steel (d) Depth below center of steel 



3| in. and under in. 



Between 3 in. and 4| in. 1 in. 



4f in. and over 1| in. 



BEAMS AND GIRDERS 



Depth to steel (d) Depth in the clear below steel 



10 in. and under 1 in. 



Between 10 in. and 20 in. 1J in. 



20 in. and over. 2 in. 



Formulas for Shear. 



V V 



= bjd Vo = bd 



Formula for Bond of Tension Rods. 



V 



Formulas for Vertical Stirrups. 



3a././d 2 Vs I v'bjd, .. 



2V a * = ^fsjd Xl = 2 -- w ( umform loadm S on] y) 



i= or <2A-d 

 Formulas for Inclined Rods. 



Z' = ^diameters x 2 = or < - ( 1 */ ? j (uniform loading only) 



a s = -^-ri-(45 degrees inclination) 



