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Minimum elongation 14.5%

 
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brahmabul
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PostPosted: Wed Oct 31, 2012 6:50 am    Post subject: Minimum elongation 14.5% Reply with quote

As per IS 13920:1993 a minimum elongation of 14.5% is specified for using high strength deformed steel bars (Fe 500 & Fe 550). I want to know if there is any rationale behind this value of 14.5%?

Because this value will somehow limit the use of even higher grades like Fe 600 or Fe 700 since % elongation decreases with higher grade. I don't think such higher grades are produced in India yet but does it mean that there is going to be a limit on the grade which can be used especially in seismic prone areas.
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Manoharbs_eq
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PostPosted: Thu Nov 29, 2012 10:03 am    Post subject: Reply with quote

Er.brahmabul


As per your post you can see what IS13920 clearly specifies. R=5 is used for structures in seismic zone iii or higher to ensure ductile failure, reinforcement steel should possess higher elongation (ductility). If you have come across the research topics you will find that wood and fe250 steel are best suited as their ductility is quite high.


It is insisted to design structure elastically for dead load and live loads but inelastic for earthquake .




ductility is one key aspect in seismic design.




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Manohar
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brahmabul
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PostPosted: Thu Nov 29, 2012 2:27 pm    Post subject: Reply with quote

@Er Manoharbs

Agree with all what you have said. Lower grades are better for ductility because of their higher percent elongation (ductility). But is it possible to use higher grade of steel having may be the same elongation as Fe 415 or Fe 250? Though I know that % elongation decreases as the yield strength increases. So perhaps my statement is little hypothetical. What are your views?

Manoharbs_eq wrote:
Er.brahmabul


As per your post you can see what IS13920 clearly specifies. R=5 is used for structures in seismic zone iii or higher to ensure ductile failure, reinforcement steel should possess higher elongation (ductility). If you have come across the research topics you will find that wood and fe250 steel are best suited as their ductility is quite high.


It is insisted to design structure elastically for dead load and live loads but inelastic for earthquake .




ductility is one key aspect in seismic design.




Rgds
Manohar
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Manoharbs_eq
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PostPosted: Thu Nov 29, 2012 4:49 pm    Post subject: Reply with quote

its highly acceptable, but as the ductility increases the steel cannot be made to have that yield strength as ductile steel yields faster.


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Manohar
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