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RE: Rebar Strengths

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We have been faced with similar situations many times.  For your project, I would recommend a load test.  This would be done by a testing laboratory and a contractor working to your specifications.  You will find all the guidance you need in the appendices to ACI 318.


Stan R. Caldwell, P.E.
Dallas, Texas

"How 'bout them Cowboys!?"  


-----Original Message-----
From: Jason Kilgore [mailto:jkilgore(--nospam--at)] 
Sent: Wednesday, October 22, 2003 2:45 PM
To: seaint(--nospam--at)
Subject: Rebar Strengths

I have a reinforced concrete building constructed in the "early 1920's".

The existing roof was obviously designed to carry future floor loads after vertical expansion of the building (it's flat with a sloped wood overbuild for drainage, vertical bars extend out of the top of the columns for future lap splices, and the columns are relatively massive - 20" hexagonal columns supporting less than 350 sq. ft. of roof).

Now, the owner wants to add some stuff to the roof.  What I need to to is determine the capacity of the roof.

There was some testing done, and I have representative rebar information (size, spacing, cover, etc.) throughout the building.  Also, cores were taken (corrected f'c varied from 3640 to 4420 psi.  Unfortunately, no testing was done on the rebar strength.  I know that some of the bars are round and some are square.

Does anyone know what strength of rebar was used back then?  I have tons of references concerning steel beams, but none concerning rebar.

Thanks for your help,

Jason Kilgore
Leigh & O'Kane, L.L.C.
816-444-9655 (FAX)

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