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RE: Square bar reinf. steel

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Last time when I worked on an existing 1930's concrete building, Mr. Harold 
 Sprague found an useful book "Reinforced Concrete Floors dated 1925 & revised 
 in 1930" for me.  If you give me your email, I will send it to you.

Martin Li, P.E.

> Date: Thu, 22 May 2014 13:58:27 -0700
> From: lrhauer(--nospam--at)
> Subject: [SEAINT-SEAOSC] Square bar reinf. steel
> To: seaint-seaosc(--nospam--at)
> 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,

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