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RE: Rebar Strengths

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I wish people aged like that! I was built in early '40's too.
ag

> -----Original Message-----
> From: Frank Hartzell [mailto:fhartzell(--nospam--at)comcast.net]
> Sent: Thursday, October 23, 2003 3:52 PM
> To: SEAINT
> Subject: Re: Rebar Strengths
> 
> 
> For your interest, we are currently looking at a structure 
> built in the
> early 40's with reinforcing specified as "structural grade". 
> This implies
> that the yield stress is 33 ksi.  Using this yield, some 
> members are very
> highly overstressed.  We have called for reinforcing tests and the one
> result so far available shows a yield of 53 ksi.  Go figure!
> 
> Frank Hartzell
> fhartzell(--nospam--at)comcast.net
> 
> Original Message:
> 
> From: "Jason Kilgore" <jkilgore(--nospam--at)leok.com>
> To: <seaint(--nospam--at)seaint.org>
> Subject: Rebar Strengths
> 
> This is a multi-part message in MIME format.
> 
> ------=_NextPart_000_0188_01C398AB.1C762440
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> 
> 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.
> jkilgore(--nospam--at)leok.com
> 816-444-3144
> 816-444-9655 (FAX)
> -- 
> 
> 
> 
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