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RE: A15, intermediate grade reinforcing

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Frank,

This was a time when working stress design was more popular than ultimate
strength design.  1963 is the closest date I have.  Intermediate grade rebar
had an allowable stress of 20,000 psi.  

I don't have ASTM specs available, but 50% of yield was used for tension,
and 40% of yield was used for compression.  So, I expect the yield stregth
is 40,000 psi.

ASTM A61 or A432 or A160 were 60,000 psi yield rebar specs. 

Paul Martin
Wichita, KS


-----Original Message-----
From: Hartzell, Frank [mailto:Frank.Hartzell(--nospam--at)jacobs.com]
Sent: Monday, September 17, 2001 3:29 PM
To: 'seaint(--nospam--at)seaint.org'
Subject: A15, intermediate grade reinforcing


Original Message
(I'm just getting around to reading old email)
From: HAWNENG(--nospam--at)aol.com [mailto:HAWNENG(--nospam--at)aol.com]
  Sent: Monday, August 06, 2001 9:25 PM
  To: Seaint(--nospam--at)seaint.org
  Subject: RE: A15, intermediate grade reinforcing


  Our office is investigating an the load capacity of an 8 inch thick
  reinforced concrete floor slab.  The floor slab is in a sanitary sewer
lift station.  The plans are dated 1970 and specify A15, intermediate grade
  reinforcing.  Can someone tell me the yield stress for this specific
  reinforcing.
-------------------------------------------------------------------------

This question may have been answered later but "Section 405(a)--Metal
Reinforcement" of ACI 318-63 states:
Reinforcing bars shall conform to "Specifications for Billet-Steel Bars for
Concrete Reinforcement" (ASTM A 15). Section 1003 of the (working
stress)code gives the allowable tensile stress of billet-steel bars as
18,000 psi.

frank.hartzell(--nospam--at)jacobs.com


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