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Re: Concrete Wall Deflection

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Refer to ACI 318. Formula to calculate EI for a
cracked section, including the effect of reinforcement
is available therein.

Rajendran

--- Steven Mallett <smallett(--nospam--at)dillon.ca> wrote:
> I am designing a buried CIP concrete structure with
> pre-cast double tee
> roof. The intent is to have the walls free on the
> top edge such that no
> axial load is induced in the double tees. Thus, I am
> attempting to
> calculate the approximate deflection of the top edge
> of the concrete
> wall as a result of horizontal loads from backfill,
> groundwater and
> surcharge. Once this deflection is known, I will
> allow for this movement
> to ensure that wall will not be bearing on the tees.
> Vertical bearing
> detail of tee will also allow this horizontal
> movement.
>
> The reinforced wall is 18" thick, height is 20 feet
> and width is 25
> feet. Design is to ACI 350R. I am looking for
> guidance on the
> method/references to calculate the deflection on the
> top edge of this
> wall. PCA document for Rectangular Concrete Tanks
> has information that
> would imply that it acts as solid concrete plate. I
> am thinking that
> some consideration should be given to the cracked
> section with
> reinforcing steel.
>
> TIA,
> Steve
>
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