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RE: Old Reinforcing Steel Grade

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Fy=40 ksi was a mid grade of reinforcing steel.  It could go down to 33 ksi per ASTM A15. 
A15 came in 3 grades: Structural Fy=33ksi        Intermediate Fy=40       Hard Fy=50ksi
You may want to get a copy of:
CRSI Engineering Data Report - 48 Evaluation of Reinforcing Bars in Old Reinforced Concrete Structures
US Army Corps of Engineers - ETL 1110-2-568, Appendix D
ASTM A305 addressed deformations and was replaced by ASTM A615. 
Check this out for deformation issues for A305 vs. A615.

Regards, Harold Sprague


From: lhauer(--nospam--at)
To: seaint(--nospam--at)
Subject: Old Reinforcing Steel Grade
Date: Fri, 10 Jun 2011 11:08:16 -0600

To All,

I am working on a job that involves an existing masonry building with the plans dated 1968. The reinf. steel spec. calls for reinforcing steel to "conform to ASTM A15 and A305-56T".

Should I assume this is Fy=40 ksi steel or can I assume a higher Fy?

Thanks in advance,

Larry Hauer S.E.