The top of the column is -200. Is there a reason?

[LeeJaeYoung]

The top of the column is -200. Is there a reason?

[Gerry Leonor]

the top node of the column is linked to Storey 1. with a -200 offset.

if Storey 1. were to increase/decrease in distance between Storey 0., the column increases with it but will retain the -200mm offset.

this can be useful when you don't want the top column node to finish at the top of the Storey 1 slab, but instead to the underside of the slab, or at the slab thickening.

[LeeJaeYoung]

thank you so much. ^^

I had the idea that the upper and lower pillars should be connected to each other.
Shouldn't it be like that when calculating the structure?