94 REINFORCED CONCRETE CONSTRUCTION 



With a given stirrup, this formula may be solved to give the 

 spacing required, or 



_3 a.f.jd 



~ 2 ~V 



The value of V should be taken at the section where the spacing 

 is desired. 



Tests have shown that little or no value is derived from stirrups 

 spaced a distance apart about equal to d. Thus, the spacing of 



/I IN 



Continuous 

 stirrup 



FIG. 45. 



stirrups must not exceed the depth of the beam, and, as we have 

 seen, the practical limit suggested by the Joint Committee is 

 three-fourths the depth. Many constructors advise the insertion 

 of occasional stirrups throughout the entire length of the beam, 

 especially T-shaped beams, even if they are not theoretically 

 necessary. 



Where only a small amount of web reinforcement is needed, 

 stirrups are occasionally spaced uniformly for convenience. 

 When this is done, only the minimum value of s needs to be 

 figured, and fchis can be obtained by substituting for V in the 

 above equation, the total shear at the end of beam. 



