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Column- Beam Moment Ratio

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UBC Seismic Prov. Chapter 22 - Sec 8.6

Hello, seeing if anyone can understand the equation 8-4 in the section listed.

The equation is like this:

Sum(Zc ( Fyc - Puc/Ag))
-------------------------------------  > 1.0
    Vn db H / ( H-db )

So my question has to do with Vn.  Vn is for a panel zone strength.
If Vn increases, why does this ratio get worse?  In my intuition, it
should be better that Vn increases because it means the column is
stronger. ??