The bar idea would probably significantly reduce the allowable tension on
the cable, similar to what knotting does, due to the force at each "bite
point" weakening the cable. I suppose if the cable was sufficiently
oversized this wouldn't pose a problem, but I'd certainly expect such a
clamping method to effectively reduce the allowable tension significantly
below the normal rated load.
I wouldn't do anything as tight as a knot, especially when both surfaces
have significant yield. The holes would have to be chamfered to prevent
cutting through the jacket. It wouldn't be much different than an insulator
if done correctly. It is all about not making the short turn radius a knife.
I'm actually a little surprised a dead end / preform isn't supposed to be
used with the straight-strand version of the cable. Those grips work by
compression of the cable they are "grabbing", and it's a fairly even
pressure over the length of the gripped area. If one could be found that
was the correct diameter for the cable being used it might be worth a
shot, but I completely agree with Tom -- TEST ANYTHING YOU TRY BEFORE
USING IT FOR REAL! He's also correct that dynamic loading is much worse
than static loading. Wind causes vibration in towers and guys and that can
cause your clamps to loosen over time, especially if they were marginal
to begin with.
There has to be considerable pressure on the jacket squeezing it into the
inner fiberglass. I'd be reluctant to use a grip on something that has a
tendency to slide. I don't think it will squeeze hard enough. The newer
Phillystran has much less tendency to have the jacket slide over the center.
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