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earthquake

 
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md zeeshan ali
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Joined: 12 Nov 2013
Posts: 36

PostPosted: Thu Nov 14, 2013 2:28 pm    Post subject: earthquake Reply with quote

dear SEFI members

how to find the negative bending moment capacity of the beam section?
in all the concrete books that i have, only positive bending moment capacity formulla of doubly reinforced section is given.
pls help me.....
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Dr. N. Subramanian
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Joined: 21 Feb 2008
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Location: Gaithersburg, MD, U.S.A.

PostPosted: Fri Nov 15, 2013 7:57 pm    Post subject: Re: earthquake Reply with quote

Assume that the beam is reversed and use the same formula! But note that you should not consider T-beam action near supports which will be subjected to neg. moment!

md zeeshan ali wrote:
dear SEFI members

how to find the negative bending moment capacity of the beam section?
in all the concrete books that i have, only positive bending moment capacity formulla of doubly reinforced section is given.
pls help me.....
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md zeeshan ali
SEFI Regulars
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Joined: 12 Nov 2013
Posts: 36

PostPosted: Sat Nov 16, 2013 2:05 pm    Post subject: Re: earthquake Reply with quote

Dr. N. Subramanian wrote:
Assume that the beam is reversed and use the same formula! But note that you should not consider T-beam action near supports which will be subjected to neg. moment!

md zeeshan ali wrote:
dear SEFI members

how to find the negative bending moment capacity of the beam section?
in all the concrete books that i have, only positive bending moment capacity formulla of doubly reinforced section is given.
pls help me.....




dear Dr. N. Subramanian
very very thanks . i am not expecting that such a great person will answer my silly question. many many thanks again.

I have tried that but by doing so i am getting negative neutral axis depth, as the steel in compression in more than the tension.

the below pdf (on page 9) ask to ignore the compressive steel, but i have not seen these assumption in the code(is 456 or is 13920). will this be correct?
guide me...



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Dr. N. Subramanian
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Joined: 21 Feb 2008
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Location: Gaithersburg, MD, U.S.A.

PostPosted: Mon Nov 18, 2013 4:13 am    Post subject: Re: earthquake Reply with quote

Dear Er Zeeshan Ali,


When beams are subjected to reversal of stresses, designers generally design them separately for sagging (Positive) and hogging(negative) moments and provide reinforcements at the appropriate face of the beam. Hence the assumption made in quoted reference (pp.9) is usual practice only.


Best wishes,
NS


dear Dr. N. Subramanian
very very thanks . i am not expecting that such a great person will answer my silly question. many many thanks again.

I have tried that but by doing so i am getting negative neutral axis depth, as the steel in compression in more than the tension.

the below pdf (on page 9) ask to ignore the compressive steel, but i have not seen these assumption in the code(is 456 or is 13920). will this be correct?
guide me...[/quote]
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md zeeshan ali
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Joined: 12 Nov 2013
Posts: 36

PostPosted: Mon Nov 18, 2013 5:29 pm    Post subject: Reply with quote

THANK YOU VARY MUCH FOR YOUR PRECIOUS HELP TO ME.

MD ZEESHAN ALI
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