Vertical Concrete Cylinder on Columns

[zikzak]

I'll try to simplify this question as best I can. Essentially there will be a reinforced concrete cylinder 16' tall, 12" thick walls, 10' diameter, 10' off the ground. 25% of the base circumference (0 - 90deg) will be supported with solid concrete. The rest of the support is to be provided by 2 columns at 180deg and 270deg.

Just trying to think in initial terms here rather than crunching hard numbers.

My initial concerns were mostly focused on the idea of curved 90deg arc beams between columns, but the more I think about it this cylinder should be able to accommodate that with reasonable reinforcing. Let's say something like #4 @ 24" OC EW and #6 @ the base.

Now I'm worried about shear conditions at the columns. Should this be a primary concern? Am I over-simplifying the radius beam condition?

 

[JAE]

Depends on seismic demand at the location - and wind. Also, #4 @ 24" o.c. does not meet minimum wall reinforcement amounts for a 12" wall.

 

[ishvaaag]

Well it doesn't seem a particularly critical structure. Size is not big, thickness is significant, in short, a thick concrete structure allowing by embedment of rebar in the wall to take any reasonable thing happening there. Just follow the demanded stresses.