TIIK DISTRIBUTION OF SHEAR STRESS 807 



Example 2. A beam of rectangular section, depth b, breadth a. 

 To investigate the distribution of shear stress over a section at 

 which the shearing force is F. 





Now 

 and 



FIG. 108, 



F 

 = TT 



b 



F f 2 j 

 aydy 



J V. A 



la 



F? 



6F / 6 2 



-rri -- 



ab 3 \ 4 



since I = 

 12 



Taking a rectangle 6 inches deep and 3 inches in width and 

 calculating the values of q at horizontal sections situated at 

 distances 0, *, I", etc., from the neutral axis. 



