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Re: aci 318 Seismic provisions

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 I have a concern about ACI 318/318r-296 regarding clause 21.4.2.2.
Sum Me must be greater than sum Mg

For most internal columns , dead and live load moments partially cancel
each other out. Therefore the design moment capacity of the column is
naturally less than that of the girders it supports. If the moment
capacities of the girders are added without taking into account the
partial neutralizing effects of their directions, the columns become
much larger than they need to be without the provision. Did i miss
something , this provision  does not seem logical for internal columns.

mark francois engineer