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dynamic properties of concrete
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brij_raychanda
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PostPosted: Tue May 11, 2010 4:33 pm    Post subject: dynamic properties of concrete Reply with quote

In high strain loading what is the properies of concrete?
what will be its elastic modulus?
any impirical formulas are available?
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suraj
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PostPosted: Tue May 11, 2010 6:10 pm    Post subject: Concrete properties Reply with quote

Concrete properties
Would question be elaborated further about high strain loading?
Modulus of Elasticity could be computed using relation Ec= 5700 under root fck N/sqmm. fck is characteristic cube strength in N/sqmm
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brij_raychanda
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PostPosted: Fri May 14, 2010 5:27 am    Post subject: Reply with quote

Actually i am doing my thesis on progressive collapse due to blast.
In that while applying blast, property of concrete doesnot remain same as it is before.
In high strian rate loading its modulus of elasticity will decrease but how much that i dont know.
So i needed some impirical formula or any values which i can apply..
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sukanta.adhikari
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PostPosted: Fri May 14, 2010 9:13 am    Post subject: Reply with quote

Some values of dynamic young's modulas are given in IS 2974 which are for machine foundation.
You can refer "soil dynamics book" by swamisaran.

Regards,
S.Adhikari





brij_raychanda wrote:
Actually i am doing my thesis on progressive collapse due to blast.
In that while applying blast, property of concrete doesnot remain same as it is before.
In high strian rate loading its modulus of elasticity will decrease but how much that i dont know.
So i needed some impirical formula or any values which i can apply..
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brij_raychanda
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PostPosted: Sun May 16, 2010 5:35 pm    Post subject: Reply with quote

Thank u sir.
I will surely check it.
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brij_raychanda
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PostPosted: Thu Aug 12, 2010 4:52 am    Post subject: Reply with quote

Adhikari sir,

As per your suggestion i have checked in IS 2974 & swamisaran book but they are based on soil properties.
And it will be different in my case.
Even in IS 4997 properties are given but they are in relation with soil which are also different then  my case.

If anybody knows concrete properties at high strain rate(blast load) then please reply ASAP.
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sukanta.adhikari
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PostPosted: Thu Aug 12, 2010 5:15 am    Post subject: Reply with quote

Please read the book.

Design of blast resistant building in petrochemical facilities published by ASCE..
There are experts in oil and gas sector in the forum..They may better guide u..

Regards,
S.Adhikari


brij_raychanda wrote:
Adhikari sir,

As per your suggestion i have checked in IS 2974 & swamisaran book but they are based on soil properties.
And it will be different in my case.
Even in IS 4997 properties are given but they are in relation with soil which are also different then  my case.

If anybody knows concrete properties at high strain rate(blast load) then please reply ASAP.
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vandana_verma
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PostPosted: Thu Aug 12, 2010 5:20 am    Post subject: Reply with quote

In IS 456 - 2000 formula for calculation of modulus of elasticity is revised and it is 5000 under root fck N/sqmm in place of 5700 under root  fck.

Regards,

Vandana
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Dr. N. Subramanian
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PostPosted: Thu Aug 12, 2010 4:31 pm    Post subject: Reply with quote

Hi Er Brij Raychanda

Please find enclosed two papers which give dynamic properties of concrete.

Best wishes
NS

brij_raychanda wrote:
Adhikari sir,

As per your suggestion i have checked in IS 2974 & swamisaran book but they are based on soil properties.
And it will be different in my case.
Even in IS 4997 properties are given but they are in relation with soil which are also different then  my case.

If anybody knows concrete properties at high strain rate(blast load) then please reply ASAP.
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ahujavipul
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PostPosted: Fri Aug 13, 2010 3:16 am    Post subject: Concrete properties Reply with quote

Dear Er. Brij:

Check ACI's SP 60. "Vibrations of concrete structures". An older publication--collection of papers on the subject you might find useful.

Regards

Vipul Ahuja

brij_raychanda wrote:
Actually i am doing my thesis on progressive collapse due to blast.
In that while applying blast, property of concrete doesnot remain same as it is before.
In high strian rate loading its modulus of elasticity will decrease but how much that i dont know.
So i needed some impirical formula or any values which i can apply..


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