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COLUMN REINFORCEMENT IN ETABS

 
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zaid_m
SEFI Member
SEFI Member


Joined: 01 Jun 2013
Posts: 8
Location: New Delhi

PostPosted: Sat Nov 16, 2013 9:12 am    Post subject: COLUMN REINFORCEMENT IN ETABS Reply with quote

AS A MATTER OF FACT THE STEEL QTY. DECREASES IN COLUMNS AS WE GO FROM GROUND TO TOP LEVEL .BUT THERE ARE INSTANCES WHERE THERE MIGHT BE A HIGHER REQUIREMENT OF STEEL IN UPPER STORY THAN WHAT YOU HAVE IN A LOWER STORY..COULD SOME ONE PLEASE ELABORATE ABOUT HOW SUCH ISSUES ARE DEALT WITH BOTH IN TERMS OF DETAILING AND EXECUTION & IN ETABS WHY AT TIMES SUCH HIGH PERCENTAGE OF STEEL OCCURS AS WE GO UP THE LEVEL??????????
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md zeeshan ali
SEFI Regulars
SEFI Regulars


Joined: 12 Nov 2013
Posts: 36

PostPosted: Sat Nov 16, 2013 2:17 pm    Post subject: Reply with quote

dear all
i am also faced same problem during desing with staad. some time you also get more number of bar on the above column then below, then how to tie the bar with lower one.(number of bar problem is not there in etab)
i only know why this happen.
when you apply lateral load on the fixed support frame, 2nd storey level will attract more moment than the 1st story ,even the axail force is more in 1st storey column, because of moment 2nd storey column need more steel then 1st one.
if i am wrong correct me.
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Dr. N. Subramanian
General Sponsor
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Joined: 21 Feb 2008
Posts: 5352
Location: Gaithersburg, MD, U.S.A.

PostPosted: Mon Nov 18, 2013 7:45 pm    Post subject: Re: COLUMN REINFORCEMENT IN ETABS Reply with quote

Dear Er Zaid,

We have discussed about it elaborately in earlier postings(2 or 3 years back). Search for it. Do not post anything only in Capital letters. It amounts to Shouting!

This happens because in upper floors BM is high and AF is low; whereas it is reversed in lower Floors. For this you need not reduce the size of columns in each floor. Better to keep the size of column same for every 5 or 6 floors. This is also good for EQ resistance.

Best wishes,
NS
zaid_ee wrote:
AS A MATTER OF FACT THE STEEL QTY. DECREASES IN COLUMNS AS WE GO FROM GROUND TO TOP LEVEL .BUT THERE ARE INSTANCES WHERE THERE MIGHT BE A HIGHER REQUIREMENT OF STEEL IN UPPER STORY THAN WHAT YOU HAVE IN A LOWER STORY..COULD SOME ONE PLEASE ELABORATE ABOUT HOW SUCH ISSUES ARE DEALT WITH BOTH IN TERMS OF DETAILING AND EXECUTION & IN ETABS WHY AT TIMES SUCH HIGH PERCENTAGE OF STEEL OCCURS AS WE GO UP THE LEVEL??????????
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zaid_m
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Joined: 01 Jun 2013
Posts: 8
Location: New Delhi

PostPosted: Tue Nov 19, 2013 4:18 am    Post subject: Reply with quote

Thank u sir for the info!
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