force in anchor reinforcement

[KLMPE]

According to ACI 318-08 RD.6.2.9, "Because the anchor reinforcement is placed below where the shear is applied...the force in the anchor reinforcement will be larger than the shear force." I don't follow why this is the case. I need a sketch and/or a formula to explain what the increase is. For instance if the rebar is 6" below the point of application of the shear, what will the increase in the force in the rebar be?

 

[pilesmakesmiles]

I'm not familiar with ACI318, and don't follow either.

Can you attach a sketch of the situation you are looking at?

 

[Lion06]

It's because it's a lever.

 

[Lion06]

Imagine a beam with two supports - pin, pin, cant. Now put a load at the cant tip. The reaction at the first column isnt equal to the load at the tip.