headed anchors for GR75 bar

[kleo]

I am designing single bar tension reinforcement for piles - the tension center bar is GR75, non-threaded. I was planning on using terminators to develop the bar but they are limited to GR60 bars. If the bars were threaded I would use a plate and nut system; the bars are already on site so I have to use the non-threaded bars. ACI 318-08, Section 12.6 states that anchors may not be used for bar fy > 60 ksi. Any thoughts on other options?
Piles are 14 inch diameter w/ 6#6 cage bars that extend 18" into the cap, which is 3 ft. thick.
Thanks-

 

[vandede427]

dywidag has mechanical splices and terminations for Grade 75

 

[Lion06]

Can you have them thread the ends of the rebar on site?

 

[unclesyd]

Take a look at this booklet from William Form Engineering.

http://www.williamsform.com/Contact_Us/PDFs/High_Capacity_Concrete_Anchors.pdf

 

[kleo]

The steel supplier sent us the wrong bars so we are going to use the ZAP screw lock system to splice short thread bars to the non-thread bars. The ZAP Type 2 splices are suitable for GR75 bars. The std plate & nut will then be added to the spliced thread bars. I will leave 4" clearance at the top of the cap for the short thread bars.