ACI 347 gives one equation for walls 14' or less and columns of any height, and a different equation for walls over 14'.
(Columns are defined as any element with a plan dimension not exceeding 4'6".)
I have a 12' wall and 15' wall I am designing, and I can't justify two completely different...
What is the justification/reasoning for almost doubling form pressures for walls over 15' tall per ACI 347 Sec. 2.2.2.1?
E.G.: 690-psf for a 14' wall or column of any height VS. 1190-psf for a 15' wall (pour rate of 3'/hr and temp. of 50 deg.)
Thanks in advance for your help
