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Column vertical bar splicing

 
This forum is locked: you cannot post, reply to, or edit topics.This topic is locked: you cannot edit posts or make replies. Thank Post    www.sefindia.org Forum Index -> E-conference on IS 16700 13th March to 18th March 2018
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kadmathew
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Joined: 26 Dec 2010
Posts: 7

PostPosted: Mon Mar 19, 2018 3:43 am    Post subject: Column vertical bar splicing Reply with quote

Hi,
Indian code insist only 50% splicing of vertical bars at one place for columns wherever US code allows full splice just above floor level. Can it be unified.


Regards,
K M Mathew

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hemalmistry
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Joined: 01 Jul 2009
Posts: 59

PostPosted: Mon Mar 19, 2018 5:01 am    Post subject: Re: Column vertical bar splicing Reply with quote

ACI 318-2014 required the column bars to be lapped with middle half of the column which are part of SMRF as per clause 18.7.4.3. Lapping just above floor is not allowed.

However, depending upon stress in tension bars and splice type (clause 10.7.5.2.2), all column bars can be lapped at a section by provided more lap length (@1.3*ld) as per clause 25.2.2.1



kadmathew wrote:
Hi,
Indian code insist only 50% splicing of vertical bars at one place for columns wherever US code allows full splice just above floor level. Can it be unified.


Regards,
K M Mathew

Sent from Yahoo Mail on Android

Posted via Email
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hemalmistry
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Joined: 01 Jul 2009
Posts: 59

PostPosted: Mon Mar 19, 2018 5:08 am    Post subject: Reply with quote

IS:13920-2016 does not allow lapping of column bars within 2d on each end of column with 50% bars lapped at a section with 300 mm clear distance between them. You will hardly find a column which will satisfy this requirement. Use of mechanical spice will be compulsory. Scope of alternate floor lapping will also be limited.  

Though clause 5.7.2.3 of IS:16700-2017 allows lap splice for 12 mm dia bars, due to requirement of IS:13920-2016, lap splice will not be even possible for 12 mm dia bars for normal height of floor and normal column size.
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