Avg Ver. Bar Center to Anchor Rod
Center Distance

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d_ar - avg ver. bar center to anchor rod center
        distance

The program will use this distance to calculate the
ver. bar's development length l_a .

It's suggested to input min( 0.5h_ef , 8" ) here and
only consider ver. bars locating within max of 8"
distance range  from anchor rods to be effective to
resist concrete breakout.

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