High strength single wire anchorage 2

[phuduhudu2]

I am proposing to cast in a concrete padstone at both ends of a 5m long brick wall. Between the two I will run a 7mm high strength wire as used in prestressed concrete within a raked out bed joint in the brick on either side. I need this to take a lateral load from the padstone at one end of the wall to the other. My question is, how can I anchor the wire into the concrete padstone at either end? I assume welding to high strength wire is not possible. I know for post tensioning they use anchor blocks but these normally cater for multiple strands coming into a single block.

 

[swearingen]

You could use some sort of swage fitting as a termination.


-5^2 = -25 ;-)

http://www.eng-tips.com/supportus.cfm

 

[Ingenuity]

Welding of high-strength prestressing wire is not recommended.

Barrel chucks (with 2 or 3 piece wedges), most often used with 7-wire strand systems, can be used to grip small dia single prestressing wire, maybe with a suitably sized bearing plate with a center hole.

Here is a photo of a barrel chuck with 2-piece wedges, from SURE-LOCK in the USA. They are available in various sizes from 6mm to 15mm.

'Back-in-the-day', single wire prestressing systems were terminated with special 'button-headed' ends - hydraulically pressed 'upsets'. Some of the machines are still around today, but I would think too cost prohibitive for your application.

Are the wires to be stressed?

If this is an exterior environment, how do you provide long-term durability to the wire/s?

 

[phuduhudu2]

Thanks ingenuity. The wires are not stressed until they get loaded in the final system. They are also bedded into an interior wall. The barrel Chuck looks like what I need.

 

[dhengr]

Phuduhudu2:
If you only need a few of them, maybe you should see if you can make a deal with your local precaster. Use sizes and materials he has available in your design. You probably should stress these wires a bit to set the end fittings and to take much of the initial elongation and slack out of the wires. Otherwise, you might get considerable movement before the wire picks up any real load. You might also take a look at some of the hardware, rods, etc. which Simpson and USP/MITEK have available for these sorts of holdown applications. These are slightly prestressed by tightening a nut on a bearing plate on installation.