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RE: Rebar fs

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If your question is in regards to reinforced concrete, then fs commonly was 
 taken at 20,000 for grade 40 and 24,000 for grade 60 reinforcement. It 
also depends on the type of steel. For example the 1963 ACI code stipulates 
for section in tension a) Billet steel or axle-steel bars, structural 
grade: 18,000 psi; b) Main reinforcement, 3/8" dia. or less in diameter, in 
one way slabs of not more than 12 ft span, 50% of the minimum specified 
yield strength by the ASTM, but not to exceed 30,000 psi; c) for deformed 
bars, yield strength of 60 ksi or more, for bars #11 and smaller: 24,000 
psi and d) for all others: 20,000 psi.

There are also categories for section in 'compression, Vertical Column 
Reinforcement' and sections in 'compression, Flexural members,' and also 
for 'spirals.'


Paul M. Kavsak, P.E.

-----Original Message-----
From: seaint-seaosc(--nospam--at) [mailto:seaint-seaosc(--nospam--at)] On 
Behalf Of Thor Tandy Sent: Wednesday, May 01, 2013 7:47 PM
To: seaint-seaosc(--nospam--at)
Subject: [SEAINT-SEAOSC] Rebar fs


Trying to recall the relationship between fs for ASD versus fy for
Ultimate/Factored design .

Can anyone remember back that far?


Thor A. Tandy P.Eng, C.Eng, Struct.Eng, MIStructE, FEC
Victoria, BC

Email:  <mailto:vicpeng(--nospam--at)> vicpeng(--nospam--at)

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