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RE: concrete reinforcing steel

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David,
For many years it was assumed that 60 grade rebar was too brittle to be bent into ties and stirrups.  Devices for bending in the old days for ties and stirrups was done with manual methods.  Thus many practitioners used 40 grade steel for ties and stirrups, but would specify 60 grade bar for flexural or compression rebar.  There was another time period that practioners would specify 60 grade bendable.  Today most rebar in all applications is 60 grade.  And all the fabricators use hydraulic presses for bending bar. 
 
This was back in the old "working stress" days and the "ultimate strength" era was dawning.  Man walked upright a couple weeks later. 
 
Companies such as TAMCO (in California) today manufacture rebar in 40, 60, and 75 grade.  Walk tall, use 60 grade for all.   

Regards, Harold Sprague


 

Date: Wed, 6 May 2009 16:11:35 -0700
Subject: concrete reinforcing steel
From: d.topete73(--nospam--at)gmail.com
To: seaint(--nospam--at)seaint.org

For as long as I can remember, #3 and #4 deformed bars were typically grade 40, while #5 bars and larger were grade 60.  Is that still the case?  or is this something local like here in the SF bay area?

--
David Topete, SE


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