Reinforcement Coupler 2

[_csways]

Hi,

We had a Contractor cut right through a #9 bar in a beam under repair. The bar is cut relatively near the existing lap.

Since development and lap splice lengths are rather significant for the large bar, we are considering a coupler to join the cut ends. What design considerations and/or restrictions do we need to be aware of? We are aware that the coupler needs to meet ASTM A1034, where coupler strength is required to be fy * 1.25.

Thanks!

 

[Agent666]

I'd say if they are available in your local market, one of those press fit/crimped type couplers would fit the bill provided there is access to get in there and crimp the coupler on the bar. If you contct some suppliers/installers in your area they would be able to give you some confirmation that their system complies with all the relevant standards.

Some of the mechanical couplers with screws that break off that are intended for repair work do not always have the guarantee that the breaking strength of the bar can be developed. This may or may not be an issue depending on the location and purpose of the bar.

 

[SlideRuleEra]

Concrete Reinforcing Steel Institute (CRSI) ETN-M-1-13 "Introduction of Steel Reinforcing Bar Splices"

and​

CRSI ETN-M-1-14 "FAQs About Mechanical Splices"

http://www.SlideRuleEra.net

 

[_csways]

Thank you both for the info

 

[JedClampett]

Another, more violent, dangerous, yet cool option are Cadwelds.
As Erico states, this is one of the most tested systems in engineering history.

 

[hokie66]

You only need a coupler on one of the cut ends and a splice bar.