No of Ver. Rebar Effective to Resist Tensile Anchors - Mux Case
Under Mux , only those anchor bolts in red as shown below are in tension.

No of ver. rebar effective to resist tensile anchors n-Mux = number of ver.
rebar located around these anchor bolts in red within min( 0.5hef , 8" )
distance.

These rebar are considered to be effective to resist anchor bolt's tensile force.


 
ACI 318-11 RD.5.2.9