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Re: 1923 Vintage CA Concrete Building

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Garner, Robert wrote:

For the strength of reinforcing bars back to 1911, download Engineering Data Report No. 48 from CRSI.  I can’t help you on this mix design, however.


Bob Garner, S.E.


From: Eknrinc(--nospam--at) [mailto:Eknrinc(--nospam--at)]
Sent: Friday, March 11, 2005 12:22 PM
To: seaint(--nospam--at)
Subject: 1923 Vintage CA Concrete Building


I am evaluating a 1923 California reinforced concrete building.


Plans call for 1-2-4 concrete mix, and deformed bars.


Anyone have information regarding design strengths used back then?



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Out of curiosity, is the rebar square bars? If so, I did a retrofit to a 1927 poured in place concrete building. The strength of the concrete was tested in shear and the resulting values were very low due to deterioration by exposure, however, where adjacent water was not allowed to hit the walls, the shear values were in excess of 2,000 psi. The testing lab placed a value on the rebar at Fs=40ksi and the spacing of the rebar considering the length of the solid walls reduce the lateral shear based on the 2003 Existing Building Code to well below the lowest tested core compressive and shear strength. Compressive strength ranged everywhere from about 600-psi to well over 2,800-psi.


Dennis S. Wish, PE
California Professional Engineer
Structural Engineering Consultant


760.564.0884 (office - fax)

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