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# Re: Water Retaining Concrete

• To: seaint(--nospam--at)seaint.org
• Subject: Re: Water Retaining Concrete
• From: Dan Huntington <huntingtondj(--nospam--at)kjww.com>
• Date: Fri, 02 Oct 1998 07:41:45 -0500

```Roger,

Good point.  However, eqn 10-4 is an excellent source to estimate the expected
flexural cracking of a section (even a wall).  I do not interpret 10-4 as an
explicit code requirement for minimum steel.  Rather, I view the equation (and
corresponding commentary equation) as the Code prescribed and endorsed method of
checking expected flexural crack widths, regardless of whether a design meets
the minimum steel requirements specified elsewhere in the Code.

Dan Huntington
KJWW Engineering

Roger Davis wrote:

> In Respnse To:
>
> From: Dan Huntington <huntingtondj(--nospam--at)kjww.com>
> To: seaint(--nospam--at)seaint.org
> Subject: Re: Water Retaining Concrete
>
> Chance,
>
> Unforturnately, I don't have a good source for you.  However, my quick calc
> of
> eqn (10-4) of ACI 318 for the situation you described above seems to
> indicate
> the design has a 'z' value roughly twice that allowed by code.  Thus twice
> the
> corresponding limiting crack width of 0.013 = 0.026 should be expected.
> Seems
> like that is what may be occuring.  If it is not to late, you may need to
> roughly double the reinforcing for the remainder of the job.  Hope all turns
> out well.
>
> Dan Huntington
> KJWW Engineering
>
> Chance, Acie P. wrote:
>
> > I am designing retaining walls which will form the edges of a lagoon. The
> * first two walls we poured have cracks which go completely through the
> wall.
>
> Equation 10-4 applies to T-sections, equation 10-3 applies to general
> flexural sections.  The requirements of 10-3 are only half of the
> requirements of 10-4.  If you consider a wall to be a vertical slab, then
> para. 10.5.1 refers you to para. 7.12.  However, para. 14.3.3 applies
> specifically to walls and it requires slightly more reinforcement than does
> para. 7.12
>
> Roger Davis
> SDS Architects, Inc.
>

```