Why Is the Larger Shear Force Value Used in Beam Stress Calculations?

[chetzread]

Homework Statement

In this notes , why the shear force used is the 19.5kN ? Why not 6.5kN ?
From what i know , the formula of shear stress is tau = VQ/ It , where V is the shear force ... There are two values of V in this question , why the larger one (19.5kN ) is chosen ?

Homework Equations

The Attempt at a Solution

Is it wrong ? or the 19.5KN is chosen for the shear force at the right end ?
While 8.5kN is chosen for the shear force at right end ? [/B]

 

[PhanthomJay]

The highest shear is at the right end so that controls the design p

 

[chetzread]

The highest shear is at the right end so that controls the design p

For so the design of beam , we will always choose the larger shear force to find the larger shear stress ?

 

[PhanthomJay]

For design of the glue type, yes, choose the larger value of shear. Now in theory, you could use a weaker glue or less glue as you move away from the area of max shear stress, but in practice, you likely wouldn't do that.