For ductile design ACI requires ASTM A706 rebar or an equivalent where the
elongation is 10-14%. A615 is typically 7-9% elongation.
----- Original Message -----
From: "Prakash C. Chowdhury" <pcchowdhury(--nospam--at)yahoo.com>
Sent: Wednesday, April 18, 2001 6:57 AM
Subject: ductility requirements for rebars
> This query may be too basic for members but I am not a civil engineer and
> am more concerned here with requirements for material specifications.
> Steel rebar specs around the world specify widely varying requirements
> for rebar 'elongation %'. One reason is that the steels vary from the
> high-carbon steels in some ASTM specs to more ductile low-alloy steels.
> As for service requirements, the steel may not be normally required to
> sustain a strain more than the 3 to 4% that the concrete can take. But
> what is the situation when designing for earthquake resistance ? Is it
> sufficient to rely on detailing for ductile design or is there a minimum
> elongation % mandated for the steel rebar ?
> When the CEB Model Code was being formulated in Europe in the 80's, there
> was a proposal to test the steel so that it undergoes 3 strain reversals
> (in the plastic region) but it may have been dropped because of the
> difficulty of regular testing for such low-cycle fatigue.
> I will welcome any responses off-list if they are considered of marginal
> interest to list members. Thanks in advance.
> Prakash C.Chowdhury, B.Sc(Surrey), Ph.D.(N'cle),
> Regional Resident Representative, Torsteel Research Foundation in
India,H-1A, Hauz Khas,New Delhi - 110 016, INDIA.
> E-Mail : pcchowdhury(--nospam--at)yahoo.com
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