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Re: Square bar reinf. steel

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I have a PCA article from '98 that indicates the reinforcing steel was
likely Intermediate grade 40 ksi steel for that era.  The concrete strength
is conservative at 2,000 psi, but could be 3,000 psi, based on ASCE 41-06
table 6-3.  Is there no indication of the concrete strength on the

On Thu, May 22, 2014 at 1:58 PM, <lrhauer(--nospam--at)> wrote:

> To All,
> I am working on the placement of some heavy HVAC units on top of an
> existing
> concrete roof of a building built in the '30's, (actuall have the plans!). 
> The concrete joists spaced at 24" o.c. call for a 5/8" square reinf. bar
> and 3/4" sq. reinf. bar at the bottom. I am assuming this is the actual
> size,
> so that the 3/4" sq. area is 0.56 sq. in., not the 0.44 sq. in. of a #6
> bar. Also, since no specs came with the drawings, I am assuming 40 grade
> steel and 2,000 psi concrete.
> Are my assumptions correct, and is there anything else I should be aware
> of?
> Thanks in advance,
> Larry Hauer, S.E.

David Topete, SE

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