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ductility requirements for rebars

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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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