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When is a wall a column?

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ACI 530 defines a wall as "A vertical element with a horizontal length to
thickness ratio greater that 3, used to enclose space."  That indicates that
a vertical section 12" x 36" is a column but a 12" x 37" section is a wall.
I can not find a similar definition for a concrete member.  At what plan
view ratio do you switch from designing a member as a column to designing it
as a wall?

Roger C. Davis
SDS Architects, Inc.

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