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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. ??

Refugio