104 REINFORCED CONCRETE CONSTRUCTION 



tension near to the point A. It will be considered feasible that 

 the bent rods should be placed to take as much diagonal tension 

 as possible from D toward A. The area BCEF should be made 

 equal to the allowable tensile stress in the two No. 1 bars; likewise 

 area EFGH should represent the tensile strength of the two 

 No. 2 bars. This would not be true, however, if the distance s 

 should turn out to be greater than 3/4d. For such a case, the 

 No. 2 bars should be placed the limiting distance from the No. 1 

 bars and the area toward the center of beam (representing the 

 diagonal tension which the No. 2 bars may be assumed to take 

 in that direction) should be made equal to rtGH. Stirrups may 

 also be supplied to take the stress between e and A. The spacing 

 near the point e would be obtained by the formula 



s = 3 a^d 



in which V is the total vertical shear at the point where the 



stirrup is placed. It will be well on the safe side to place the first 

 stirrup one-half the computed spacing to the right of point e. 



If possible, when bent up rods cannot take all the diagonal 

 tension, it would be better design to bend up the rods as far from 

 the end of beam as possible so that stirrups may be employed 

 toward the end of beam where the diagonal tensile stresses are 

 greatly inclined, rather than toward the center of beam as in 

 Fig. 49. This method would be followed if the distance a were 



