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# column design

## column design

(OP)

hello
I have a concrete column with axial force (compr) and biaxial bending.
I would like to know, when can I ignore the non-principal moment and just
design as compresion+bending.

Is there an ACI recomendation.

I read something like the moment>20%of the principal-moment. Is that correct??
Also e/h=0.005??; I am not sure, Thank you very much.

### RE: column design

You find guide to this in EHE 43.5.3 article (of vigent spanish code for reinforced concrete).

Condition is

(ex/b)/(ey/h)<=0.25

ex lays on parallel to b
ey lays on parallel to h, actual depth.

The correspondent statement when the other orthogonal flexure is predominant is

(ey/h)/(ex/b)<=0.25

### RE: column design

I don't think there is anything in ACI that lets you ignore a biaxial moment.  Chapter 8 governs analysis and Chapter 10 governs column design and neither speak of what you are proposing.  I also couldn't find anything in various text books and references regarding concrete design.  All assume that if you have both moments acting under a load combination, you should include them in your analysis.

### RE: column design

I forgot to express that what such EHE clause permits is to substitute the biaxial check by 2 separate plane checks, P-Mx and P-My, not at all the dismissal of the weak moment.

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