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Re: Minimum Reinforcing in Compression M

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Roger,

You are (of course) completely correct.  That is the other reason listed
in the commentary for section 10.9.1 of ACI 318 (same as the UBC section
1910.9.1).  But, I neglected to mention it.  Thanks for correcting me.

HTH,

Scott
Ypsilanti, MI


On Fri, 1 Aug 2003, Roger Turk wrote:

> Scott Maxwell wrote:
>
> . > The minimum steel requirement is supposedly there due to the potential for
> . > bending, even if there is no apparent bending on the member.
>
> Scott,
>
> It is my understanding that the minimum reinforcing in compression members is
> to account for creep and shrinkage stresses in the concrete.  Creep and
> shrinkage stress tests in the 1930's showed that low volumes of reinforcing
> can yield due to creep and shrinkage, therefore not contribute to the
> capacity of the compression member.  The minimum reinforcing requirements are
> to ensure that there is sufficient reinforcing present so that it will not be
> at yield due to creep and shrinkage.
>
> A. Roger Turk, P.E.(Structural)
> Tucson, Arizona
>
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