According to ACI 318-95 eq. 10-8, a column is slender only if kl/r>34 since
M1 and M2 are zero, in your case.
Therefore eq. 10-2 for designing columns is applicable.
According to British Standards BS8110. They have 2 equations
I hope the above answers your question
From: BDWOLF123(--nospam--at)aol.com <BDWOLF123(--nospam--at)aol.com>
To: seaint(--nospam--at)seaint.org <seaint(--nospam--at)seaint.org>
Date: ÇáÇÑÈÚÇÁ, íæäíæ 23, 1999 09:53 PM
Subject: Slender concrete columns
>Anyone out there know how to deal with a concrete column with axial load
>with a kl/r ratio larger than 22?