Conc. Wall or Column?
Conc. Wall or Column?
(OP)
I have a series of 32"x8" concrete columns at about 12' on center. Several have 200+ kips (factored axial load) on them. I was planning to treat them as columns and provide confined reinforcement but some other engineers in my office say the columns are actually wall segments and can be designed using the empirical equation 14-1 ACI 318 which means only minimum reinforcing is required. Wall or columns? I cannot find a definition for a wall other than:
Member, usually vertical, used to enclose or separate spaces.
and using the column definition everything is a column.
Thanks for any input
Member, usually vertical, used to enclose or separate spaces.
and using the column definition everything is a column.
Thanks for any input






RE: Conc. Wall or Column?
RE: Conc. Wall or Column?
For my situation phi*Pnw= 0.55*.70*4000*32*8[1-(1.0*144/32/8)^2]= 269.5 kips
This is more than enough.
RE: Conc. Wall or Column?
RE: Conc. Wall or Column?
phi@Pn,max = .80*.65*[.85*4000(256-2.56)+(60000*2.56)
= 528 kips >>>= 200 kips.
This is a great deal more capacity than is required and you will be adding a lot of unwarrented labor. If you have concerns then require the wall detail to use closed ties instead of just horizontal bars. This will give some confinement.
RE: Conc. Wall or Column?
RE: Conc. Wall or Column?
You should try to find out what precast manufacturers do for their lite walls. That's the best comparison that I can think of.
Also, you could contact ACI for an opinion. They are pretty good at answering questions like this.
I would not use them unconfined until I found out more about this stuff.
DBD
RE: Conc. Wall or Column?