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Anonymous Poster #1

Splicing

04/29/2016 8:22 AM

my question is i have a span of 27 meters footing tie beam and the available deformed bars here is from 6 meters up to 12 meters only.how can i splice the top rebars and bottom rebars

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#1

Re: splicing

04/29/2016 8:28 AM

Ask the Civils Designer.

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#2

Re: Splicing

04/29/2016 10:17 AM

..." splice continuous top bars at mid span and splice continuous bottom bars at or near supports. "...

ACI 318-11 covers this....

http://www.eng-tips.com/viewthread.cfm?qid=361292

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Anonymous Poster #1
#3
In reply to #2

Re: Splicing

04/29/2016 11:18 AM

Yes thats the rule but the span is 27 meters if i used the 12mts long so its still short

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#4
In reply to #3

Re: Splicing

04/29/2016 11:59 AM
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#5
In reply to #3

Re: Splicing

04/30/2016 7:50 AM

Use Mechanical Splicing devices and 3 pieces of rebar, so it really doesn't matter where you place the devices.

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#6

Re: Splicing

04/30/2016 7:58 AM

Take a look at Halfens "Bargrip" Coupler, as it doesn't involve threaded rebar ends, which I am not fond of, unless you have low stresses in the steel.

http://halfen-moment.com/en/wp-content/pdf/Coupler.pdf

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#7

Re: Splicing

04/30/2016 11:10 PM

The ACI 318 book is a good one to look at--a lap splice is generally acceptable, if tied together. Units of measure are US, not metric, but conversion should be straightforward. I believe part of that has been used in www.daytonsuperior.com/docs/default.../ds_rebar_splicing_hb.pdf?...44.
The table on page 6 gives length of lap for various bar sizes and concrete strengths under two cases of bar spacing, with separate entries for top or bottom bars.

--JMM

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#8

Re: Splicing

05/04/2016 5:46 AM

I seem to remember reading that if rebars are overlapped there is no need for couplers, as the bond strength, overlap length*bar circumference*bond shear strength, can exceed the allowable bar tensile load. But maybe somebody will say that's wrong.

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