From the diameter point of view: three circles fit exactly within one circle
with a double diameter. But they leave gaps. I don't know what counts for
the thrength: the mass or the surface off the cross section. In the latter
case you might need about a 4-ply to fill the gaps.
And then we are still talking about pull-strength, not push-strength or
stiffness. Suspension bridges may use plied wire cables, the pilons never
are! I'll ask one of by brothers about this, it is his job to make such
calculations.
It might be interesting to plait the wire around a stick or tube or thicker
wire to get enough sthrength.
Jo Falkink
near Gouda, Netherlands
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