No of Hor. Rebar Leg That Are Effective to Resist Shear V_ux

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Number of tie leg or hor. hair pin leg in one single layer around the shear key
pocket for resisting concrete shear breakout.

n_leg x n_lay would be the total number of hor. rebar used in concrete shear
breakout resistance calculation.

In the sample shear key reinforcement detail below there are 4 tie legs in
both directions.
In this sample case,  user can input  n_leg= 4