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column shape comparison

column shape comparison

column shape comparison

(OP)
If two concrete columns were holding up a beam between them (that went through the concrete), how would the following two shapes compare, structurally?

Two 8-inch cylindrical columns

-vs-

Two 12-inch half-cylindrical columns with the flat sides facing one another

RE: column shape comparison

The first pir is easier to design by established method. Don't see any advantage in the 2nd pair (I would never use it unless for architectural reasons).

RE: column shape comparison


Why attempt to construct a column with a half circle cross-section (unless it's absolutely required by the architect)?

Just cuz concrete can assume any shape doesn't make it easy to construct.  A column cross-section like that would prove to be much more expensive to form (there are no "standard" forms for that cross-section).  And, whatever form the contractor dreams up is unlikely to produce reliable results.

Although I suppose you could use half of a steel or FRP circular column form combined with a sheet of plyform bolted to it.  If the circular forms are readily available in your area.

Just my NTBH opinion.
 

Ralph
Structures Consulting
 

RE: column shape comparison

(OP)
I see, thank yous.

RE: column shape comparison

Some jurisdictions have a minimum column size for concrete.

Dik

RE: column shape comparison

The eight inch diameter circle has slightly less area, but probably has a higher moment of inertia on the weakest axis.  Therefore, I can think of no reason to prefer the half circle cross section.  As others have noted, forming the half circle will add cost to the half-circle columns.  Good luck.

RE: column shape comparison

What is this? A homework problem in a concrete class?

RE: column shape comparison

(OP)
Just a hypothetical question...  it wasn't intended to be a logistical discussion, by the way.  Thanks again!

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