Shear Flow in Beams

 

Example: * (continued)

 

                                                                    

                        

 

 

Note:  Q is the first moment of the area between where the shear stress is to be calculated
and where the shear stress is zero.  See the "hatched" area shown in the figure above.

 

 

   Therefore   Q  =  A’ ybar  =  (25)(130)(130 + 12.5)  =  4.63 x 106  mm3

 

                      V  =  FI/Qs   

 

where   F  = 1200 N,         I  =  (1/12)(260)(310)3 – (1/12)(160)(260)3  =  411 x 106 mm4

              s  =  100 mm

                     

     V  =  Vmax  =  (1200)(411 x 106) / (4.63 x 106 )(100)  =  10,650 N   (result)

 

 

Click here for another example.

 

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